Thermal expansion properties and hygro-scopicity of Y_(2-x)Sm_xW_3O_(12) (x=0.0-0.4) compounds

作     者：YU ZhouXiang1, PENG Jie2, WANG Hui2, WU MeiMei2, CHENG YingZhi2, HU ZhongBo2 & CHEN DongFeng1 1 China Institute of Atomic Energy, P.O. Box 275 (30), Beijing 102413, China 2 College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China 

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

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2008年第51卷第1期

页      面：25-32页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：rare earth tungstates negative thermal expansion hygroscopic XRD 

摘      要：A novel class of solid solutions of Y2-xSmxW3O12 (x = 0.0–0.4) were synthesized and studied by means of powder X-ray diffraction. All samples crystallize in an ortho- rhombic space group Pnca. The lattice parameters a, b and c of Y2-xSmxW3O12 in- crease with increasing Sm content. Since the compounds of this series hydrate at room temperature, thermogravimetric (TG) analysis was carried out. The result shows that the compound stores less water with increasing Sm content. The thermal expansion properties of Y2-xSmxW3O12 (x = 0.1, 0.3 and 0.4) were investi- gated with high temperature X-ray diffraction. Negative thermal expansion coeffi- cient αl becomes less negative from -6.644×10-6 to -6.211×10-6℃-1 when x changes from 0.1 to 0.4.