[1] [1] K E Sickafus, J M Wills, N W Grimes. Structure of spinel [J]. J Am Ceram Soc, 1999, 82(12): 3279-3292.

[2] [2] Y Suzuki, R B Van Dover, E M Gyorgy, et al.. Structure and magnetic properties of epitaxial spinel ferrite thin films [J]. Appl Phys Lett, 1996, 68(5): 714-716.

[3] [3] T Arima, Y Yamasaki, T Goto, et al.. Spin-lattice coupling in ferroelectric spiral magnets: comparison between the cases of (Tb, Dy) MnO3 and CoCr2O4 [J]. J Phys Soc Jpn, 2007, 76(2): 023602.

[4] [4] I Kim, Y S Oh, Y Liu, et al.. Electric polarization enhancement in multiferroic CoCr2O4 crystals with Cr-site mixing [J]. Appl Phys Lett, 2009, 94(4): 042505.

[5] [5] Y J Choi, J Okamoto, D J Huang, et al.. Thermally or magnetically induced polarization reversal in the multiferroic CoCr2O4 [J]. Phys Rev Lett, 2009, 102(6): 067601.

[6] [6] N Mufti, A A Nugroho, G R Blake, et al.. Magnetodielectric coupling in frustrated spin systems: the spinels MCr2O4 (M=Mn, Co and Ni) [J]. J Phys: Condensed Matter, 2010, 22(7): 075902.

[7] [7] K Singh, A Maignan, C Simon, et al.. FeCr2O4 and CoCr2O4 spinels: multiferroicity in the collinear magnetic state [J]. Appl Phys Lett, 2011, 99(17): 172903.

[8] [8] V I Torgashev, A S Prokhorov, G A Komandin, et al.. Magnetic and dielectric response of cobalt-chromium spinel CoCr2O4 in the terahertz frequency range [J]. Phys Solid State, 2012, 54(2): 350-359.

[9] [9] S Kitani, M Tachibana, N Taira, et al.. Thermal study of the interplay between spin and lattice in CoCr2O4 and CdCr2O4 [J]. Phys Rev B, 2013, 87(6): 064402.

[10] [10] R Padam, D Pal, S Ravi, et al.. Structural and magnetic properties of Co (Cr1-yAly)2O4 (y=0.0~0.2) compounds [J]. Journal of Superconductivity and Novel Magnetism, 2013, 26(5): 1607-1610.

[11] [11] R Masrour, A Elegrini, M Hamedoun, et al.. Study of magnetic properties in spinels CoxZn1-xCr2O4 systems [J]. Journal of Superconductivity and Novel Magnetism, 2012, 25(4): 1093-1096.

[12] [12] D Kamenskyi, H Engelkamp, T Fischer, et al.. Observation of an intersublattice exchange magnon in CoCr2O4 and analysis of magnetic ordering [J]. Phys Rev B, 2013, 87(13): 134423.

[13] [13] S Tiwari, D Sa. A phenomenological Landau theory for electromagnons in cubic spinel multiferroic CoCr2O4 [J]. J Phys: Condensed Matter, 2010, 22(22): 225903.

[14] [14] Chen Jinhua, Shi Wenbo, Zhang Xueying, et al.. Roles of Li+ and Zr4+ cations in the catalytic performances of Co1-xMxCr2O4 (M=Li,Zr; x=0~0.2) for methane combustion [J]. Environ Sci Technol, 2011, 45(19): 8491-8497.

[15] [15] A F Shojaei, A R Tabari, M H Loghmani. Normal spinel CoCr2O4 and CoCr2O4/TiO2 nanocomposite as novel photocatalysts, for degradation of dyes [J]. Micro & Nano Letters, 2013, 8(8): 426-431.

[16] [16] Xue Limei, Xu Pucha, Li Zhe. Microcosmic crystalloid structure and absorbency of spinel nano-particles [J]. Journal of Heilongjiang Institute of Science and Technology, 2010, 20(1): 10-13.

[17] [17] Xue Limei, Chen Bin, Zhang Fenghua. Prepared and photocatalytic properties of Na-doped CoCr2O4 spinel [J]. Journal of Heilongjiang Institute of Science & Technology, 2012, 22(3): 256-258.

[18] [18] Hu Dongsheng, Han Aijun, Ye Mingquan, et al.. Preparation and spectroscopy analysis of spinel CoCr2-xAlxO4 by low-temperature combustion synthesis [J]. J Inorg Mater, 2011, 26(3): 285-289.

[19] [19] Yang Lijuan, Gu Fang, Zhang Jiahong, et al.. First-principles study of the electronic structures and optical properties of Ba0.5Ca0.5ArO3 [J]. Journal of Atomic and Molecular Physics, 2013, 30(2): 275-280.

[20] [20] Zhang Fuchun, Zhang Zhiyong, Zhang Weihul, et al.. First-principles calculation of electronic structure and optical properties of AZO(ZnOAI) [J]. Acta Optica Sinica, 2009, 29(4): 1025-1031.

[21] [21] Cai Jianqiu, Tao Xiangming, Luo Haijun, et al.. Ab-initio investigation of anisotropic optical properties of Sr2RuO4 [J]. Acta Optica Sinica, 2010, 30(12): 3580-3585.

[22] [22] Chen Qian, Xie Quan, Yang Chuanghua, et al.. Frist-principles calculation of electronic of Mg2Si with doping [J]. Acta Optica Sinica, 2009, 29(1): 229-235.

[23] [23] Zhou Shiyun, Xie Quan, Yan Wanjun, et al.. First-principlees calculation of electronic structure and optical properties of CrSi2 with doping Mn [J]. Acta Optica Sinica, 2009, 29(10): 2848-2853.

[24] [24] Yan Wanjun, Zhang Zhongzheng, Guo Xiaotian, et al.. First principles calculation on the photoslectric properties of V-Al co-doped CrSi2 [J]. Acta Optica Sinica, 2014, 34(4): 0416002.

[25] [25] Huang Kun, Han Ruqi. Solid-State Physics [M]. Beijing: Higher Education Press, 1988. 442-447.

[26] [26] Tian Yun, Feng Qing, Din Shoubing, et al.. Effect of red shift in rutile TiO2 caused by nonmetallic impurity C, N, S Co-doping [J]. Acta Optica Sinica, 2013, 33(8): 0816004.

[27] [27] Yan Wanjun, Zhou Shiyun, Xie Quan, et al.. First principles study of electronic structure and optical properties for Co-doped β-FeSi2 [J]. Acta Optica Sinica, 2011, 31(6): 0616003.

[28] [28] Yan Wanjun, Zhou Shiyun, Xie Quan, et al.. Effect of Al doping concentration on electronic and optical properties of CrSi2 [J]. Acta Optica Sinica, 2012, 32(5): 0516003.