Zero and controllable thermal expansion in HfMgMo（3-x）WxO（12）

HfMgMo（3-x）WxO（12） with x = 0.5, 1.0, 1.5, 2.0, and 2.5 are developed with a simple solid state method. With increasing the content of W, solid solutions of Hf Mg Mo3-xWx O12 crystallize in an orthorhombic structure for x≤2.0 and a monoclinic structure for x2.0. A near-zero thermal expansion（ZTE） is...

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Bibliographic Details
Published in:中国物理B：英文版 2017, Vol.26 (1), p.348-352
Main Author: 李涛 刘献省 程永光 葛向红 张孟迪 连虹 张莹 梁二军 李玉晓
Format: Article
Language:English
Subjects:
X射线衍射
单斜结构
可控
拉曼光谱
斜方晶系
溶液结晶
热膨胀系数
电性差异
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Summary:HfMgMo（3-x）WxO（12） with x = 0.5, 1.0, 1.5, 2.0, and 2.5 are developed with a simple solid state method. With increasing the content of W, solid solutions of Hf Mg Mo3-xWx O12 crystallize in an orthorhombic structure for x≤2.0 and a monoclinic structure for x2.0. A near-zero thermal expansion（ZTE） is realized for HfMgMo（2.5）W（0.5）O（12） and negative coefficients of thermal expansion（NCTE） are achieved for other compositions with different values. The ZTE and variation of NCTE are attributed to the difference in electronegativity between W and Mo and incorporation of a different amount of W, which cause variable distortion of the octahedra and softening of the MoO4 tetrahedra, and hence an enhanced NCTE in the a- and c-axis and reduced CTE in the b-axis as revealed by Raman spectroscopy and x-ray diffraction.
ISSN:1674-1056
2058-3834