Microstructure, dielectric, ferroelectric and piezoelectric properties of <inline-formula><math display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><msub><mrow><mtext>K</mtext></mrow><mrow><mn>0</mn><mo>.</mo><mn>4</mn><mn>5</mn></mrow></msub></math></inline-formula><inline-formula><math display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><msub><mrow><mtext>Na</mtext></mrow><mrow><mn>0</mn><mo>.</mo><mn>4</mn><mn>5</mn></mrow></msub></math></inline-formula><inline-formula><math display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><msub><mrow><mtext>Li</mtext></mrow><mrow><mn>0</mn><mo>.</mo><mn>1</mn></mrow></msub></math></inline-formula>NbO<sub>3</sub> lead-free ceramics prepared via cold sintering with post-annealing

Neng Qin; Xiao-Ming Chen; Xin-Yu Huang; Jia-Jun Lan; Yu-Ding Xu; Li-Na Liu; Han-Li Lian; Peng Liu

doi:10.1142/S2010135X24500103

Journal of Advanced Dielectrics, Volume. 15, Issue 1, 2450010(2025)

Microstructure, dielectric, ferroelectric and piezoelectric properties of $K_{0.45}$ ${Na}_{0.45}$ ${Li}_{0.1}$ NbO₃ lead-free ceramics prepared via cold sintering with post-annealing

Neng Qin, Xiao-Ming Chen^*, Xin-Yu Huang, Jia-Jun Lan, Yu-Ding Xu, Li-Na Liu, Han-Li Lian^**, and Peng Liu

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Via the method of cold sintering with post-annealing, the lead-free ceramics $K_{0.45}$ ${Na}_{0.45}$ ${Li}_{0.1}$ NbO₃ were prepared. The cold sintered pellet without post-annealing shows a relative density ( $ρ_{r})$ of 77.9%, which is larger than $ρ_{r}$ of the green pellet via the conventional solid-state sintering (SSS) method ( $～ 65.1 %$ ). The cold sintered pellets were post-annealed at temperatures between $97 5^{°}$ C and $107 5^{°}$ C. The effect of post-annealing temperatures on microstructure, dielectric, ferroelectric and piezoelectric properties of the ceramics was studied in detail. After being post-annealed, the relative densities and grain sizes of the ceramics were increased. The ceramics post-annealed at $105 0^{°}$ C show excellent dielectric, ferroelectric and piezoelectric properties. Compared to the conventional SSS method, the method of cold sintering with post-annealing is successful in preparing dense $K_{0.45}$ ${Na}_{0.45}$ ${Li}_{0.1}$ NbO₃ lead-free ceramics in a wide temperature range and at relatively low temperatures.

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Keywords

cold sintering dielectric property ferroelectric property microstructure Potassium sodium niobate

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Neng Qin, Xiao-Ming Chen, Xin-Yu Huang, Jia-Jun Lan, Yu-Ding Xu, Li-Na Liu, Han-Li Lian, Peng Liu. Microstructure, dielectric, ferroelectric and piezoelectric properties of $K_{0.45}$ ${Na}_{0.45}$ ${Li}_{0.1}$ NbO₃ lead-free ceramics prepared via cold sintering with post-annealing[J]. Journal of Advanced Dielectrics, 2025, 15(1): 2450010