| High Solubility of Hetero-Valence Ion （Cu^2＋） for Reducing Phase Transition and Thermal Expansion of ZrV1.6P0.4O7 |
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| 引用本文： | 袁保合,;袁焕丽,;宋文博,;刘献省,;程永光,;晁明举,;梁二军.High Solubility of Hetero-Valence Ion （Cu^2＋） for Reducing Phase Transition and Thermal Expansion of ZrV1.6P0.4O7[J].中国物理快报,2014(7):149-151. |
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| 作者姓名： | 袁保合 ;袁焕丽 ;宋文博 ;刘献省 ;程永光 ;晁明举 ;梁二军 |
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| 作者单位： | [1]School of Physical Science & Engineering and Key Laboratory of Materials Physics (Ministry of Education), Zhengzhou University, Zhengzhou 450052; [2]North China University of Water Resources and Electric Power, Zhengzhou 450011 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 10974183 and 11104252, the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20114101110003, the Fund for Science and Technology Innovation Team of Zhengzhou Province under Grant No l12PCXTD337, and the Postdoctoral Research Sponsorship in Henan Province under Grant No 2011002. |
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| 摘 要： | Large thermal expansion at room temperature and high phase transition temperature of ZrV2O7 limit its practical applications and are reduced by the high solubility of hetero-valence ion （Cu^2＋） on the basis of an equal-valence substitution of P^5＋ for V^5＋. The temperature-dependent Raman spectra show that Zr0.9CU0.1V1.6P0.4O6.9 maintains a normal parent cubic structure till 173 K and transforms to a 3 × 3 × 3 cubic superstructure below 173K. Temperature dependent x-ray diffraction patterns of Zr0.9CU0.1V1.6P0.4O6.9 show near zero and negative thermal expansion. High solubility of lower valence Cu^2＋ relates to an equal-valence substitution of smaller pH for P^5＋, which extends the bond angle of V（P）-O-V in ZrV1.6P0.4O7 close to 180°. The change of microstructure is considered to be responsible for reduced phase transition temperature and thermal expansion.
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| 关 键 词： | 相变温度 负热膨胀 溶解度 离子 异质 铜 二氧化锆 立方结构 |
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