Acoustic and Elastic Properties of Polycrystalline Potassium Sodium Niobate under High Pressures

XIAO Likang; FENG Qiu; FANG Leiming; ZHOU Zhangyang; XIONG Zhengwei; LAN Jianghe; YANG Jia; LIU Yi; GAO Zhipeng

doi:10.11858/gywlxb.20230660

Volume 37 Issue 6

Dec 2023

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Chinese Journal of High Pressure Physics > 2023 > 37(6): 061101.

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XIAO Likang, FENG Qiu, FANG Leiming, ZHOU Zhangyang, XIONG Zhengwei, LAN Jianghe, YANG Jia, LIU Yi, GAO Zhipeng. Acoustic and Elastic Properties of Polycrystalline Potassium Sodium Niobate under High Pressures[J]. Chinese Journal of High Pressure Physics, 2023, 37(6): 061101. doi: 10.11858/gywlxb.20230660

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Acoustic and Elastic Properties of Polycrystalline Potassium Sodium Niobate under High Pressures

doi: 10.11858/gywlxb.20230660

1.
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China
2.
School of Mathematics and Physics, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
3.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
4.
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 15 May 2023
Rev Recd Date: 14 Jun 2023

Available Online: 22 Oct 2023

Issue Publish Date: 15 Dec 2023

Abstract

Abstract

Polycrystalline Na_0.5K_0.5NbO₃ ceramics were prepared under the condition of 10 GPa and 1050 ℃. The compression and shear wave velocities of the samples under various hydrostatic pressures were measured using ultrasonic interferometry. By fitting the third-order finite strain state equation, the bulk and shear moduli of polycrystalline Na_0.5K_0.5NbO₃ and their pressure dependency were determined as 172.6 GPa, 54.6 GPa, 0.3 and 2.1, respectively. The sample shows a positive pressure dependence of Young’s modulus. Based on the elastic modulus data, the Poisson’s ratio was obtained as 0.342, indicating that the material was ductile and shows brittleness under high pressure. The Vickers hardness and fracture toughness also show positive pressure dependence. Using the empirical models, the Vickers hardness and fracture toughness of the ceramics were obtained as 2.40 GPa and 2.33 MPa·m^1/2. Meanwhile, based on the elastic wave velocity and density data, the Debye temperature (513.1 K) and the Grüneisen constant (2.113) of Na_0.5K_0.5NbO₃ ceramics were derived. Our results provide an experimental reference for evaluating the acoustic and elastic-related comprehensive properties of Na_0.5K_0.5NbO₃ under high pressure, and a foundation for its engineering applications under extreme high-pressure conditions as well.
- Na_0.5K_0.5NbO₃,
- high pressure,
- sound velocity,
- elasticity,
- hardness,
- fracture toughness

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Acoustic and Elastic Properties of Polycrystalline Potassium Sodium Niobate under High Pressures

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Acoustic and Elastic Properties of Polycrystalline Potassium Sodium Niobate under High Pressures

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