Zero and controllable thermal expansion in HfMgMo_(3-x)W_xO_(12) |
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| Institution: | 1. School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education, Zhengzhou University, Zhengzhou 450052, China;
2. Henan Key Laboratory of Photovoltaic Materials and School of Physics and Electronics, Henan University, Kaifeng 475004, China;
3. School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education, Zhengzhou University, Zhengzhou 450052, China |
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| Abstract: | HfMgMo3-xWxO12 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 HfMgMo3-xWxO12 crystallize in an orthorhombic structure for x≤2.0 and a monoclinic structure for x>2.0. A near-zero thermal expansion (ZTE) is realized for HfMgMo2.5W0.5O12 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. |
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| Keywords: | zero thermal expansion negative thermal expansion orthorhombic structure solid solution Raman spectroscopy |
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