Zero thermal expansion in Cs_(2)W_(3)O_(10)  

作　　者：Juan Guo Mingyuan Fang Qingsong Liu Xiao Ren Yongqiang Qiao Mingju Chao Erjun Liang Qilong Gao 

机构地区：[1]School of Physics&Microelectronics,Key Laboratory of Materials Physics of Ministry of Education of China,Zhengzhou University,Zhengzhou 450052,China

出　　处：《Chinese Chemical Letters》2024年第7期538-541,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22071221,21905252);Natural Science Foundation of Henan Province(Nos.212300410086,222301420040 and 222300420325)。

摘　　要：Zero thermal expansion materials are important for the practical applications due to their shape stability as changing temperature.The reported concept of average atomic volume is an available method to hunt new zero thermal expansion materials.Here,according to this concept,a tetragonal tungstate Cs_(2)W_(3)O_(10)with zero expansion has been found.There is no structure phase transition as increasing temperature from 150 K to 573 K.The coefficient of thermal expansion of axes and volume areαa=0.0074×10^(-6)K^(-1),αc=1.63×10^(-6)K^(-1),andαV=1.60×10^(-6)K^(-1),respectively,in the temperature range of 150~573 K.The temperature-and pressure-dependent Raman spectra reveal that the vibrations of WO6octahedra libration modes with positive total anharmonicity and W-O-W bending mode with negative Grüneisen parameter are possibly the origin of zero thermal expansion in Cs_(2)W_(3)O_(10).

关 键 词：Zero thermal expansion Cesium tungstate Raman spectra Average atomic volume Temperature-dependent X-ray diffraction 

分 类 号：TB34[一般工业技术—材料科学与工程]