The two-dimensional (2D) heterostructures are considered to have the potential to be applied to a new generation of photodetectors due to its unique two-dimensional layered structure and excellent photoresponse properties. The 2D material family is rich in variety, because of its wide band gap distribution, the photoresponse can cover the range from ultraviolet to infrared. Since the two- dimensional material layers are combined by van der Waals force, theoretically, it is possible to use the van der Waals force interaction between different two-dimensional material layers to prepare a variety of 2D heterostructures with excellent performance. In recent years, a variety of 2D heterostructures have been fabricated by mechanical stacking and CVD growth methods, and the 2D heterostructures photodetectors show excellent performance in the visible to far-infrared band. According to this research background, this paper reviews the research progress on 2D heterostructure photodetectors in recent years from the aspects of preparation of 2D heterostructures, the device preparation, and the device performance.

The super large sapphire single crystal plate was successfully grown in a self-designed single-crystal growth furnace with edge- defined film-fed growth (EFG) method, the ideal temperature distribution of the die surface was designed by thermal field simulation. Two-stage heating is used to control the crystal stress and bubble defects, and to choose a suitable pulling rate to control the distribution of the bubble layer. The crystal could yield a plate with usable dimensions of up to 690 mm×300 mm×12 mm, X-ray diffraction show a full-width at half-maximum (FWHM) of the rocking curve of 0.016 3°, indicating a high crystalline quality. Results of transmission measurements performed on 5 mm thick samples are presented and the transmission is similar to sapphire grown by other techniques.

The growth of DAST (4-N,N-dimethylamino- 4,-N,-methylstilbazolium tosylate) crystal with large (001) surface area is challengingbut necessary for intense broadband Terahertz(THz) sources. Here, the effect of the growth solution concentration on the crystal shapewere studied by slope nucleation method-coupled slow cooling(SNM-SC) technique. With careful control over the growth conditions, DASTcrystals with large (001) surface area were harvested. Surface morphology shows good surface quality. Without further surface polishing,this allowed to generate single cycle THz pulses with high optical-to-THz conversion efficiency reaching 0.66%.

The near infrared luminescence properties of rare earth ions are widely used in the fields of optical communication and solar energy utilization. Based on the problem of weak near infrared emission in materials, the Ce3+sensitizers were selected to enhance the near infrared emission intensity of Nd3+. The Ce3+and Nd3+co-doped Y3Al5O12(YAG) single crystal with large size was prepared by the Czochralski method. The sample phase structure was analyzed by X-ray diffractometer, the luminousness and absorption properties were characterized by the transmittance spectra. The energy transfer behavior between Ce3+and Nd3+was preliminarily determined through the excitation and emission spectrum of Ce3+ ions. The influence on luminescence property of Ce3+to Nd3+ was investigated by the near excitation and emission spectrum. The experimental results show that the 1 060 nm near infrared emission intensity enhanced 1.5 times under 450 nm excitation, which was due to the effective energy transfer from Ce3+to Nd3+.

In order to obtain the SI-GaAs material with high resistivity and mobility, the VGF(Vertical Gradient Freeze) method was used to grow the SI-GaAs single crystal which the polycrystalline for growth were come from the high pressure synthesis method and the HB synthesis method. Then the concentration of EL2, carbon and resistivity, mobility of the corresponding single crystal chips were tested and analyzed, and the influence of the different GaAs stoichiometric on concentration of EL2 and electrical parameters of the single crystal was compared and analyzed. After several times of experiments, the concentration reasonable scope of EL2 and carbon under the condition of the resistivity greater than >1×108 Ω?cm and the mobility greater than 5×103 cm2/(V?s) were determined. Finally, the experiment conclusion was used to guide the single crystal growth of SI-GaAs which used for MBE epitaxial growth, and what’s more, realizing the crystal growth having a great repeatability and consistency on high resistivity and mobility.

The dispersion relations of the triangular plasma photonic crystals in TE mode and TM mode were calculated by finite element method. The influences of plasma filling fraction on the band positions and band gap widths were analyzed. The results show that the plasma photonic crystal has two unidirectional band gaps in M-Γ and X-M directions, respectively in TM mode. With increasing of the filling fraction, the bands shift to higher frequencies, and the band gap widths increase and finally reach a stable value. In the TE mode, the plasma photonic crystal not only has a unidirectional band, but also has the flat bands with low frequencies, which are the surface plasma waves. A complete band gap forms at the large filling fraction, and the band gap widths increase with increasing of the filling fraction. An effective way for fabrication of tunable plasma photonic crystals is provided, which may find wide applications in the manipulation of microwaves or Terahertz waves.

A single-layer MoS2 (n)/a-Si(i)/c-Si (p)/μc-Si (p+) heterojunction solar cell structure was designed, and the back field′s band gap, doping concentration and defect density of the layers on open circuit voltage, short circuit current, fill factor and conversion efficiency was simulated using AFORS-HET software. The results show that the back-surface field band gap is between 1.5-1.7 eV, and the back-surface field doping concentration is greater than 1×1018 cm-3, the solar cell of this structure has a relatively stable performance. As the defect density increases, the solar cell efficiency decreases linearly with the logarithm of the defect density. When the defect density is controlled below 1011 cm-3, a conversion efficiency greater than 24.10% can be obtained, and when the defect density is 109 cm-3, the highest conversion efficiency 29.08% can be obtained. Finally, the effect of the back-surface field layer on the structure of the solar cell is studied. The results show that when the defect density is effectively controlled, the addition of the back-surface field improves the cell efficiency significantly.

Firstly, the (001) plane oriented TiO2 nanosheet array film was prepared by hydrothermal method, and CdS nanoparticles were synthesized by hydrothermal method. The effects of hydrothermal reaction time on the structure and properties of the obtained films were investigated. Secondly, Cu element precursor was introduced into the hydrothermal reaction process in order to improve the photoelectrochemical performance of the composite film. And the effects of doping concentrations on the properties of the composite film were discussed. The results indicate that Cu element doping effectively broadens the light absorption range of the CdS sensitized TiO2 composite film (CdS/TiO2) and improves the photoelectrochemical properties of CdS/TiO2. When the hydrothermal reaction is carried out for 3 h and the Cu doping concentration was 1∶1 000, the photoelectrochemical properties of CdS/TiO2 are optimized.

Li+, Bi3+ doped Lu2O3∶Ho3+, Yb3+ powders were prepared by high temperature solid state method. The microstructure of the synthesized powder was analyzed by X-ray diffractometer. The morphology and size of the sample were observed by field emission scanning electron microscopy. The up conversion emission spectra and energy level lifetime of the synthesized powders were analyzed by UV-Vis near-infrared fluorescence spectrometer. The results show that Li+, Bi3+ doped Lu2O3∶Ho3+, Yb3+ powders still maintain the Lu2O3 cubic phase structure. After Li+ or Bi3+ doped, the dispersion of the synthesized powders is better, the particles are more uniform and closer to the sphere, and the particle size of Li+ doped powders increases obviously. Under the excitation of 980 nm, the green light intensity of Ho3+ in the 4%Li+ or 1.5%Bi3+doped powders is increased by about 3.9 times and 2.8 times, respectively. With the increase of Li+ concentration, the 5S2 energy level lifetime of Ho3+ in the synthetic powders increase first and then decrease, while with the increase of Bi3+ concentration, the energy level lifetime of synthetic powders are gradually shortened.

In this paper, the nucleation and growth characteristics of graphene fabricated on copper foils by low pressure chemical vapor deposition in both conventional growth chamber and vapor trapping chamber were comparatively studied via adjusting the flow rate of CH4. The results indicate that the nucleation density of graphene in the vapor trapping chamber decreases three orders of magnitude than that in the conventional growth chamber and graphene nucleus could grow up rapidly. Meanwhile, the vapor trapping chamber was in favor of the fabrication of perfect graphene domains by providing a stable growth environment. By supplying adequate effective activated carbon atoms, the rate of jointing process of graphene domains in the vapor trapping chamber could be accelerated, bettering the quality of graphene film. On the basis of the experimental results, the mechanism of the vapor trapping chamber impacting the nucleation and growth of graphene was discussed as well.

Cu-In-Zn-S (CIZS) quaternary quantum dots (QDs) were prepared by hydrothermal method. The effects at different reaction temperatures and Cu/In molar ratios on phase composition, microscopic morphology, and fluorescence performance of CIZS QDs were studied by X-ray diffraction (XRD), energy spectrometer (EDS), transmission electron microscope (TEM), and fluorescence spectrophotometer (PL). The surface property of CIZS QDs was characterized by Fourier transform infrared spectrometer (FT-IR). The results show that the QDs presented spherical shape with good dispersion in aqueous solution, and the particle sizes were 3-4 nm. Moreover, the prepared CIZS QDs exhibites excellent luminescence property. The emission intensity of CIZS QDs was gradually improved with the increase of reaction temperature, and the QDs exhibited the strongest emission at 110 ℃. However, the impurity of In2S3 phase was formed at excessive temperature, resulting in the decrease of emission intensity. Moreover, the emission peak of CIZS QDs show a blue-shift tendency from 675 nm to 644 nm with the decrease of Cu/In ratios, and the emission intensity gradually enhanced and reached maximum value at n(Cu)/n(In)=1∶7. Meanwhile, the quantum yield peaked at 6.2%. The LED based on CIZS quantum dot has achieved luminescence successfully, CRI values of 81.2 and LE of 36.8 lm/W, which indicated that CIZS QDs have a good application prospect in the field of lighting.

The preparation conditions of phosphor based on Ba2Mg(BO3)2 host was systematically investigated, effect of Eu3+ content on the host lattice environment and luminescent properties of phosphor as well. The research results show that Ba2+ is increasingly deviate from symmetric center with increase of Eu3+ content. When Eu3+ content is very low, the maximum emission peak of the Ba2Mg(BO3)2∶Eu3+ is at 594 nm. However, Eu3+ content is over 3at%, the emission intensity at 613 nm peak is dramatically enhanced, and is more than that of at the peak of 594 nm in case Eu3+ content is over 3.5at%, which is attributed to the degree of distortion of crystal structure, and result in obvious change of the symmetric properties of the crystal lattice, thus forbidden electric dipolar 5D0→7F2 transition is more released. The prepared orange phosphor can be effectively excited by near ultraviolet InGaN chip and applied to white LED.

The ZnO1-xSx-SiO2 doped Eu3+ luminescent materials were prepared by sol-gel-precipitation method. The luminescence properties and structure of the materials were studied by IR, XRD, TEM, EDS and excitation spectroscopy, emission spectroscopy, and the focus of the research is the effect of SiO2 incorporation on the luminescence properties of luminescent materials. The results show that the samples have formed the chemical bond of Si-O-Si, Zn-S and Si-O4 perssad, introduction of SiO2 can improve the luminescent properties of the materials. And determine the optimum annealing temperature is 800 ℃, the content of S is 2.4at%, the optimum excitation wavelength of the material is 395 nm. Finally, the mechanism of material luminescence is presumed based on the structure.

MgFe2O4/ZnO magnetic nanocomposite materials was prepared by hydrothermal method, and the narrow band gap MgFe2O4magnetic semiconductor is matched with the wide band gap ZnO semiconductor to form a composite photocatalyst with heterojunction. The composites were characterized by X-ray diffraction (XRD), Scanning electron microscope(SEM), Vibration sample magnetic field meter(VSM), and UV- visible diffuse reflectance spectroscope (UV-Vis DRS), meaning to analysis its surface structure, morphology, magnetic properties and photocatalytic activity. Results show that the introduction of MgFe2O4 effectively extend the absorption range, thereby enhance the ZnO photodegradation efficiency of pollutant improves the adsorption capacity and photocatalytic activity of composites. The photodegradation efficiencies of MO are approximately 95.2% after 60 min under visible light. After 5 cycles recovery tests, its photocatalytic degradation of methyl orange is still above 87.3%.

Bi4Ti3O12/Ag/AgCl (BTO/Ag/AgCl) composite nanofibers were prepared and their visible light photocatalysis activities were studied. BTO nanofibers were prepared by electrostatic spinning and calcined at high temperature. BTO/Ag/AgCl composite fibers were prepared by chemical deposition and photoreduction modification of Ag/AgCl nanoparticles on BTO nanofiber surface. The results show that both of BTO and Ag/AgCl are highly crystallized. The BTO/Ag/AgCl shows enhanced visible light absorption than pure BTO nanofiber. Photocatalysis performance shows due to the enhanced visible light absorption and p-n junction between Ag/AgCl and BTO, BTO/Ag/AgCl composite nanofibers show enhanced visible light photocatalysis performance than BTO fibers. The degradation efficiency can be improved from 29% to 80% after 100 min visible light irradiation.

There are two necessary conditions for whisker growth in the liquid phase system. First, there are “one-dimensional dominant bonding”growth units in the whisker growth system.Second, there are inert growth units, these inert growth primitives must have certain stability energy, and their stability must be smaller than that of the growth primitives which play the main bonding role.In this paper, some examples of whisker growth are cited for demonstration.

Using cBN, TiC and Al as main experimental materials, polycrystalline cubic boron nitride (PCBN) composites were synthesized at high temperature and ultrahigh pressure conditions. The phase composition, microstructure, surface microcracks and various elemental distributions of the composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray dispersive spectroscopy (EDS). The microhardness and flexural strength of the material were tested. The research shows that the PCBN sintered body is composed of BN, TiC, AlB2 and AlN at an ultrahigh pressure of 5.5 GPa and a high temperature of 1 450 ℃. The binder is uniformly distributed around the cBN particles, and the cBN particles are firmly bonded together. The hardness of PCBN increases remarkably with the increase of cBN content and the flexural strength increases first and then decreases. The fracture mode of PCBN is the result of the combination of intergranular fracture and transcrystalline fracture.

Based on the first-principles method, six interface models of WC-Co/cBN4B, WC-Co/cBN4N, WC-Co/cBN1B-near OA, WC-Co/cBN1N-near OA, WC-Co/cBN1N-near OB and WC-Co/cBN1B-near OB were established, then its interface adhesion work and fracture toughness were calculated. The WC-Co/cBN4B interface has the maximum adhesion work of 9.705 J?m-2, and the interface is the most stable. The work is greater than the fracture toughness of the WC(0001)w interface of 7.824 J?m-2, so the crack tends to appear in the matrix. While the WC-Co/cBN4N interface has the minimum adhesion of 4.470 J?m-2, and the interface is the most unstable. The work is less than the fracture toughness of the WC (0001)w interface, so the crack tends to appear at the interface. Based on this, the charge density difference, density of states and Mulliken population analysis were carried out to explain the interface stability from the deep perspective of charge transfer, bonding mode and valence electron distribution. The results show that:there is charge transfer between Co and B atoms at the interface of WC- Co/cBN4B model, which is hybridized by Co-d and B-p orbital to strong Co-B covalent bond. There is also charge transfer between Co and N atoms at the interface of WC-Co/cBN4N model, which is hybridized by Co-d and N-p orbital to weak Co-N covalent bond. At the interface of the two models, the population of Co-B covalent bonds is larger, the bond length is smaller and the bond energy is larger. The effect of Co-B covalent bonds is stronger than that of Co-N covalent bonds. Therefore, WC-Co/cBN4B has better interface bonding performance and more stable interface.

h-BN samples with different morphology were prepared by microwave reaction with boric acid and melamine as main raw materials. The morphology, structure, purity and adsorption property of the samples were characterized. The results show that:compared with the drying method, the samples obtained by freeze-drying are more slender, and the length-diameter ratio of samples obtained by freeze-drying is 3-6 times higher than that by drying. Compared with the samples without surfactant, the samples with surfactant are more distinct.The addition of salt can not only promote the crystal growth, but also make the morphology of the sample diverse, and produce square and original flake nanocrystals. In addition, the h-BN obtained by the method has more mesoporous and good adsorption capacity for methylene blue, and the adsorption rate of 10 min is as high as 91% or more.

Under hydrothermal conditions, a 1D chain-like Keggin-based hybrid, [Cu2(H3L)2] (SiMo12O40) (H2L=2,6-dimethyl-3,5-bis(pyrazol-3- yl)pyridine), was successfully prepared using utilizing CuCl2?2H2O, Na2SiO3, Na2MoO4 and 2,6-dimethyl-3,5-bis(pyrazol-3-yl) pyridine as starting materials. The crystal structure of the compound was characterized by single crystal X-ray diffraction analysis, TGA, IR spectra and elemental analysis.The results show that the compound crystallizes in the triclinic system, space group P-1 with a=1.168 9(5) nm, b=1.215 7(5) nm, c=1.223 3(5) nm, α=62.066(5)°, β= 62.833(5)°, γ=74.789(5)°, V=1.363 8(10) nm3, Z=2, R1=0.082 4, wR2=0.174 5. In addition, the electrochemical properties of the compound display better electrocatalytic activity toward the reduction of nitrite.

The electronic structure and optical properties of undoped, Cu, I doped and Cu-I co-doped anatase phase TiO2 were calculated using the first-principles based on density functional theory.The results show that the red shift of absorption band edge can be caused by Cu, I doped TiO2 alone.For I doped TiO2, due to the interaction of the 5p orbital of I and the 2p orbital of O, the forbidden band width reduces, thus the absorption band edge is red shifted. For Cu doped TiO2, the 3d orbital of Cu introduces two impurity levels at the top of the valence band, which causes the top of the valence band to move upward. This makes the forbidden band width smaller, and the absorption band edge is significantly red-shifted.For Cu-I co-doped TiO2, Cu mainly acts at the valence band top, I mainly acts at the conduction band bottom, and then introduces impurity energy levels, so that the band gap is obviously reduced and the absorption band edge is sharply red shifted. The formation of electron and hole trapping centers by the synergistic action of Cu-I effectively hinders the recombination of electron-hole pairs and improves the catalytic efficiency for visible light.

In recent years, Ag nanowire-based transparent electrodes have received extensive attention as an alternative to indium tin oxide (ITO) owing to their excellent electrical conductivity and excellent toughness. They are used in a variety of electronic devices, such as touch screens, organic solar energy batteries, monitors, etc. However, in the application of transparent electrodes, low haze, and hence the poor conductivity arising from low aspect ratio Ag nanowires limit their usage, and hence, it is of urgency to increase the aspect ratio of these wires. In the investigation, Ag nanowires were prepared by a one-step polyol method, and the effects of mixed poly (vinylpyrrolidone) (PVP) with different molecular weights on the coating and growth process were investigated. During the growth process, the coating of the mixed molecular weight PVP on the surface of Ag nanowires allows them to grow in a single direction while reducing their width, thereby increasing the aspect ratio. The outcome of study demonstrates that the re-nucleation point of the PVP system is smaller than that of the single-molecular-weight PVP system, and the aspect ratio of Ag nanowires is higher. The molecular weights of 1 300 000 and 58 000 are fused by a weight ratio of 2∶1, and at this point, the formed Ag nanowires possessed the smallest width and the longest length to display a higher aspect ratio of up to 1 200 or more.

For the purpose of accelerating the practical application of NaSICON NaZr2(PO4)3 powders, a solid-state reaction method at low- temperature was developed to prepare NaZr2(PO4)3 powders using ZrOCl2?8H2O and NaH2PO4?2H2O as raw materials. The influence of phosphate content on the synthesis of NaZr2(PO4)3 powders was investigated by XRD, SEM and Raman techniques. The results show that excess amount of phosphate is beneficial to obtain the pure phase of NaZr2(PO4)3. In addition, the as-prepared powders with average particle size of 1 μm show uniform size and good dispersion when the mole ratio of ZrOCl2?8H2O to NaH2PO4?2H2O is 2∶5.4. The occurrence of solid-state reaction during grinding process is found to play an essential role in the preparation of NaZr2(PO4)3 powders. On the one hand, the amorphous NaZr2(PO4)3 produced by solid-state reaction contributes to the formation of crystalline NaZr2(PO4)3. On the other hand, the in-situ generation of NaCl provides favorable liquid environment for the crystal growth. Furthermore, this work develop a facile and effective route for the mass production of NaZr2(PO4)3 powders.

In this paper, the effects of double-layer SiNx-SiNx anti-reflection films and three-layer SiNx-SiNx-SiO2 anti-reflection films with oxide layer for polycrystalline silicon solar cells performance were analyzed. The simulation results show that the electrical output characteristics of the three-layer SiNx-SiNx-SiO2 anti-reflection films polycrystalline silicon solar cells with oxide layer are better than the double-layer SiNx-SiNx anti-reflection films polycrystalline silicon solar cells. Experimental analysis show that the reflectivity of the three-layer SiNx-SiNx-SiO2 anti-reflection films is slightly higher than that of the double-layer SiNx-SiNx anti- reflection films, but the three-layer SiNx-SiNx-SiO2 anti-reflection films polycrystalline silicon solar cells with oxide layer have a good passivation effect, and increased the photoelectric conversion efficiency.

In recent years, due to its high conductivity and surface hydrophilicity, good ion transfer performance and excellent mechanical properties, MXene has received extensive attention and made some progress in the field of energy storage, among which the research on Ti3C2Tx MXene materials is the earliest and most common. In this paper, MXene films with the same quality was prepared by spraying method on cellulose paper, ordinary A4 paper, smoother filter paper and coarse filter paper, and the thin films with different thickness was sprayed on the same paper substrate. Then the same shape of finger pattern was carved by laser engraving machine and finally was assembled into microsupercapacitor. The electrochemical properties of MXene based microsupercapacitors were tested to reveal the effects of different thickness and paper substrate on the electrochemical properties of MXene based microsupercapacitors (MSCs). The areal capacitance of a single device can reach 78 mF/cm2, and the energy density is as high as 14.1 mWh/cm2 at the power density of 115.5 mW/cm2. Four devices connected in series can drive a clock.

Using Mg(NO3)2?6H2O as the magnesium source and Al(NO3)3?9H2O as the aluminum source, a highly dispersed magnesium-aluminum layered double hydroxide MgAl-LDH was prepared by hydrothermal method and calcined to generate MgAl-LDO. The product was characterized and analyzed by Field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron analysis (XPS), nitrogen adsorption-desorption method, and its adsorption mechanism was discussed. The results show that the adsorption process of the two products is basically the same as the Langmuir adsorption model. Among them, the specific surface area of MgAl-LDO is larger and the adsorption performance is better. The maximum adsorption capacity of methyl orange can reach 925.9 mg?g-1. Adsorption mechanisms include chemical interaction, hydrogen bonding, electrostatic interaction, and surface complexation.

Effect of pH value and calcination temperature on the crystalline properties of MgO nanosheets was investigated via liquid phase method in alcohol-water system with Mg(NO3)2?6H2O as magnesium, PEG-2000 as surfactant and NH3?H2O as precipitant. The crystal phase composition, morphology and pore structure of MgO nanosheets were characterized by XRD, SEM and BET. The results indicate that pH value and calcination temperature have no effect on the phase composition of MgO nanosheets, but posed significant impact on the micro- morphology and specific surface area of MgO nanosheets. Lower pH value and calcination temperature, or higher pH value and calcination temperature cause irregular shape and different degree of agglomeration of samples, with smaller specific surface area. The products has regular shape and good dispersibility under the condition of pH=10 and calcination temperature of 500 ℃, specific surface area of 145.42 m2?g-1, pore volume of 0.67 cm3?g-1 and average pore diameter of 18.56 nm.

Hydroxyapatite(HAP) is similar to the inorganic components of human bones, and has good biocompatibility and bone conduction properties. Β-Tricalcium Phosphate (β-TCP) is a biodegradable and bioabsorbable bioactive material. Its degradation products Ca, P can enter the living body's circulatory system to form new bone, becoming an ideal hard tissue replacement material. Calcium carbonate (CaCO3) and phosphoric acid (H3PO4) were used as raw materials to synthesize biphasic calcium phosphate ceramic powder by direct precipitation method. Then, polyurethane foam carrier was prepared by laser forming technique, and porous gelatin/biphasic calcium phosphate ceramic scaffold was prepared by a foam dipping method. Finally, glutaraldehyde is used to crosslink with the scaffold to improve performance. The composition, morphology and structural characteristics of the composite porous scaffolds were analyzed by XRD and SEM. The degradability, porosity, mechanical properties and cytotoxicity of the composite bioscaffolds were evaluated. The results show that the powder prepared by the experiment was biphasic calcium phosphate, and the composition includes β-Tricalcium Phosphate (β-TCP) and Hydroxyapatite (HAP), among them, β-TCP is the main phase. The biological scaffold has a good pore structure, including a regular through hole and an irregular communication hole, the through hole diameter is between 800 μm and 950 μm, the irregular communication hole is between 300 μm and 500 μm, and the average porosity of the scaffold is 83.1%; The average compressive strength of the scaffold reaches 1.06 MPa, which satisfies the mechanical requirements of the bone tissue engineering for the scaffold material; the cytotoxicity of the bioscaffold is grade 0 or grade 1, no cytotoxicity, and has good degradation performance.

Sr0.92-1.5xBixCa0.08TiO3 (0.155≤x≤0.195) solid solution was prepared by solid state reaction method, and fixed amounts of MnCO3 and ZnO were added as modifiers and sintering aids. The structure and dielectric properties were investigated by XRD, SEM and LCR analyser. The results show that when x≥0.165, a second phase appeares in the ceramic samples. With the increase of Bi3+ content, the dielectric constant increases first, then decreases, and the dielectric loss decreases first, then increases. When x=0.16, the capacitor ceramic dielectric material with high dielectric constant(ε=1 153), low loss(tgδ1KHz=3.5×10-4) and high insulation strength(Eb=9.37 kV/mm).