The structure, thermal expansion and phase transition properties of Ho2Mo3-xWxO12 (x=0, 1.0, 2.0) solid solutions

被引：4
|
作者：
Liu, X. Z. [1 ]
Hao, L. J. [1 ]
Wu, M. M. [1 ]
Ma, X. B. [1 ]
Chen, D. F. [1 ]
Liu, Y. T. [1 ]
机构：
[1] China Inst Atom Energy, Dept Nucl Phys, Beijing 102413, Peoples R China
来源：
MATERIALS RESEARCH BULLETIN | 2015年 / 70卷
关键词：
Oxides; X-ray diffraction; Crystal structure; Phase transitions; Thermal expansion; MO-SUBSTITUTED ZRW2O8; ORTHORHOMBIC Y2MO3O12; X-RAY; MOLYBDATE; TEMPERATURE; TUNGSTATE; POLYMORPHISM;
D O I：
10.1016/j.materresbull.2015.05.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Three solid solutions of Ho2Mo3-xWxO12(x = 0,1.0, 2.0) were prepared by solid state reaction method, the temperature dependent in-situ X-ray diffraction and thermal analysis were performed to investigate their structure and thermal expansion. All samples have orthorhombic structure(space group Pbcn#60) with negative thermal expansion at the room temperature. the substitution of W for Mo enlarges the lattice constant and slightly influences the negative thermal expansion. An irreversible phase transformation to the Pba2 phase(Tb2Mo3O12 structure) was observed at high temperature for Mo-rich samples. This ploymorphism could be effectively suppressed by the W-substitution for Mo, this phenomenon could be explained by the lower electronegativity of W6+ than Mo6+. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：640 / 644
页数：5
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