| Phase transition and thermal expansion property of Cr2-xZr0.5xMg0.5xMo3O12 solid solution |
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| 作者姓名： | 宋文博 王俊俏 李志远 刘献省 袁保合 梁二军 |
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| 基金项目： | supported by the National Natural Science Foundation of China(Grant Nos.10974183 and 11104252);the Science Fund of the Ministry of Education of China(Grant No.20114101110003);the Fund for Science&Technology Innovation Team of Zhengzhou City,China(Grant No.112PCXTD337);the Postdoctoral Research Sponsorship in Henan Province,China(Grant No.2011002) |
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| 摘 要： | Compounds with the formula Cr2-xZr0.5xMg0.5xMo3O12（x = 0.0, 0.3, 0.5, 0.9, 1.3, 1.5, 1.7, 1.9） are synthesized, and the effects of Zr4＋ and Mg2＋ co-incorporation on the phase transition, thermal expansion, and Raman mode are investigated. It is found that Cr2-xZr0.5xMg0.5xMo3O12 crystallize into monoclinic structures for x 〈 1.3 and orthorhombic structures for x _〉 1.5 at room temperature. The phase transition temperature from a monoclinic to an orthorhombic structure of Cr2Mo3O12 can be reduced by the partial substitution of （ZrMg）6＋ for Cr3＋. The overall linear thermal expansion coefficient decreases with the increase of the （ZrMg）6＋ content in an orthorhombic structure sample. The co-incorporation of Zr4＋ and Mg2＋ in the lattice results in the occurrence of new Raman modes and the hardening of the symmetric vibrational modes, which are attributed to the MoO4 tetrahedra sharing comers with ZrO6/MgO6 octahedra and to the strengthening of Mo-O bonds due to less electronegativities of Zr4＋ and Mg2＋ than Cr3＋, respectively.
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| 关 键 词： | 热膨胀性能 固溶体 斜方晶结构 线性热膨胀系数 相转变温度 相变 单斜晶系 斜方晶系 |
Phase transition and thermal expansion property of Cr_(2-x)Zr_(0.5x)Mg_(0.5x)Mo_3O_(12) solid solution |
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| Abstract: | negative thermal expansion material, phase transition, Raman spectroscopy |
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| Keywords: | negative thermal expansion material phase transition Raman spectroscopy |
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