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Temperature Dependence of the Cation Distribution in Nickel Aluminate Spinel from Thermodynamics and X-Rays

Authors

  • Yong Sheng Han,

    Corresponding author
    1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 10084, China
      †Author to whom correspondence should be addressed. e-mail: hanysh@tsinghua.org.cn
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  • Jian Bao Li,

    1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 10084, China
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    • *Member, American Ceramic Society.

  • Xiao Shan Ning,

    1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 10084, China
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  • Bo Chi

    1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 10084, China
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  • D. Johnson—contributing editor

  • This work was supported by The National High Technology Research and Development Program of China (863 program) under No. 2002AA335012.

†Author to whom correspondence should be addressed. e-mail: hanysh@tsinghua.org.cn

Abstract

The single crystal NiAl2O4 was prepared by a solid-state reaction. The change of its cation distribution with temperature was calculated by a modified thermodynamic equation by including a new parameter δ, which is a characteristic of nonconfiguration entropy. The calculated results showed that the degree of inversion for NiAl2O4 decreases with temperature, although the temperature dependence of cation distribution is very weak. This result was supported by X-ray diffraction measurement.

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