中国物理B ›› 2014, Vol. 23 ›› Issue (6): 66501-066501.doi: 10.1088/1674-1056/23/6/066501

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Phase transition and thermal expansion property of Cr2-xZr0.5xMg0.5xMo3O12 solid solution

宋文博a, 王俊俏a, 李志远a, 刘献省a, 袁保合a b, 梁二军a   

  1. a School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministryof Education of China, Zhengzhou University, Zhengzhou 450052, China;
    b North China University of Water Resources and Electric Power, Zhengzhou 450011, China
  • 收稿日期:2013-10-10 修回日期:2013-12-27 出版日期:2014-06-15 发布日期:2014-06-15
  • 基金资助:
    Project 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), and the Postdoctoral Research Sponsorship in Henan Province, China (Grant No. 2011002).

Phase transition and thermal expansion property of Cr2-xZr0.5xMg0.5xMo3O12 solid solution

Song Wen-Bo (宋文博)a, Wang Jun-Qiao (王俊俏)a, Li Zhi-Yuan (李志远)a, Liu Xian-Sheng (刘献省)a, Yuan Bao-He (袁保合)a b, Liang Er-Jun (梁二军)a   

  1. a School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministryof Education of China, Zhengzhou University, Zhengzhou 450052, China;
    b North China University of Water Resources and Electric Power, Zhengzhou 450011, China
  • Received:2013-10-10 Revised:2013-12-27 Online:2014-06-15 Published:2014-06-15
  • Contact: Liang Er-Jun E-mail:ejliang@zzu.edu.cn
  • Supported by:
    Project 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), and 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 corners with ZrO6/MgO6 octahedra and to the strengthening of Mo-O bonds due to less electronegativities of Zr4+ and Mg2+ than Cr3+, respectively.

关键词: negative thermal expansion material, phase transition, Raman spectroscopy

Abstract: 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 corners with ZrO6/MgO6 octahedra and to the strengthening of Mo-O bonds due to less electronegativities of Zr4+ and Mg2+ than Cr3+, respectively.

Key words: negative thermal expansion material, phase transition, Raman spectroscopy

中图分类号:  (Thermal expansion; thermomechanical effects)

  • 65.40.De
61.50.Ks (Crystallographic aspects of phase transformations; pressure effects) 78.30.-j (Infrared and Raman spectra)