Phase Transition and Negative Thermal Expansion Property of ZrMnMo$_{3}$O$_{12}$
Xiang-Hong Ge1,2, Yan-Chao Mao1, Lin Li1, Li-Ping Li1, Na Yuan1, Yong-Guang Cheng1, Juan Guo1, Ming-Ju Chao1, Er-Jun Liang1**
1College of Physical Science and Engineering, Key Laboratory of Materials Physics (Ministry of Education), Zhengzhou University, Zhengzhou 450052 2Zhongyuan University of Technology, College of Science, Zhengzhou 450007
Abstract：A novel material of ZrMnMo$_{3}$O$_{12}$ with negative thermal expansion is presented. The phase transition temperature and coefficient of thermal expansion (CTE) are investigated by temperature-dependent x-ray diffraction and Raman spectra. It is shown that ZrMnMo$_{3}$O$_{12}$ adopts monoclinic structure with space group $P21/a$ (No. 14) from 298 to 358 K and transforms to orthorhombic with space group $Pnma$ (No. 62) above 363 K. The linear CTE obtained from the results of XRD refinement is $-2.80\times10^{-6}$ K$^{-1}$ from 363 to 873 K. The CTE of the bulk cylinder ceramic measured by a thermal dilatometer is $-4.7\times10^{-6}$ K$^{-1}$ from 373 to 773 K approximatively.
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2016, Vol. 33 
