Crystal structures and thermal expansion properties of Y_(2-x)Er_xMo_4O_(15) (x=0.0-2.0) solid solutions

作     者：YU Zhouxiang CHEN Dongfeng WANG Hui PENG Jie CHENG Yingzhi WU Meimei HU Zhongbo 

作者机构：China Institute of Atomic Energy Beijing 102413 China College of Chemistly and Chemical Engineering Graduate University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2007年第26卷第5期

页      面：426-434页

核心收录：

学科分类：07[理学] 0806[工学-冶金工程] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the Nuclear Industry Science Foundation of China Bai Ren Ji Hua of the Chinese Academy of Sciences 

主　　题：thermal expansion crystal structure molybdate XRD 

摘      要：A new series of rare earth compounds,Y2-xErxMo4O15 （x=0.0-2.0）,were synthesized and their structures were determined by powder X-ray diffraction （XRD）. Rietveld analysis of XRD patterns reveals that the compounds of this series crystallize in monoclinic system with space group P21/c. The lattice parameters a,b,c,β and the unit cell volume V de-crease linearly with increasing Er content. The thermal expansion properties of these compounds were studied under high-temperature XRD. Positive thermal expansions of compounds Y2-xErxMo4O15 are found to be anisotropic along the three crystallographic directions where a and c axes expand while b axis contracts in the whole temperature range. By analysis of data,the expansion of weak band Mo2-O14 with rising temperature should be responsible for positive thermal expansion.