高压物理学报2023，Vol.37Issue(6)：57-68,12.DOI:10.11858/gywlxb.20230660
多晶铌酸钾钠在高压下的声学和弹性性质研究
Acoustic and Elastic Properties of Polycrystalline Potassium Sodium Niobate under High Pressures
摘要
Abstract
Polycrystalline Na0.5K0.5NbO3 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 Na0.5K0.5NbO3 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·m1/2.Meanwhile,based on the elastic wave velocity and density data,the Debye temperature(513.1 K)and the Grüneisen constant(2.113)of Na0.5K0.5NbO3 ceramics were derived.Our results provide an experimental reference for evaluating the acoustic and elastic-related comprehensive properties of Na0.5K0.5NbO3 under high pressure,and a foundation for its engineering applications under extreme high-pressure conditions as well.关键词
Na0.5K0.5NbO3/高压/声速/弹性/硬度/断裂韧性Key words
Na0.5K0.5NbO3/high pressure/sound velocity/elasticity/hardness/fracture toughness分类
数理科学引用本文复制引用
肖礼康,冯秋,房雷鸣,周章洋,熊政伟,蓝江河,杨佳,刘艺,高志鹏..多晶铌酸钾钠在高压下的声学和弹性性质研究[J].高压物理学报,2023,37(6):57-68,12.基金项目
国家自然科学基金委-中国工程物理研究院NSAF联合基金(U2230119) （U2230119）
四川省自然科学基金(2022NSFSC0333) （2022NSFSC0333）
四川省杰出青年基金(22JCQN0005) （22JCQN0005）
