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Y4Si2O7N2: A New Oxynitride with Low Thermal Conductivity

Authors

  • Luchao Sun,

    1. High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    2. Graduate School of Chinese Academy of Sciences, Beijing, China
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  • Bin Liu,

    1. High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
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  • Jiemin Wang,

    1. High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
    2. Graduate School of Chinese Academy of Sciences, Beijing, China
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  • Jingyang Wang,

    Corresponding author
    • High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
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  • Yanchun Zhou,

    1. Aerospace Research Institute of Materials and Processing Technology, Beijing, China
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    • Fellow, The American Ceramic Society.
  • Zijun Hu

    1. Aerospace Research Institute of Materials and Processing Technology, Beijing, China
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Author to whom correspondence should be addressed. e-mail: jywang@imr.ac.cn

Abstract

Search for new thermal barrier materials with high-temperature stability is very difficult because there are intractable choices among thousands of possible candidates. The present paper shows that identifying and developing new low thermal conductivity materials can be accomplished by first-principles calculations of equilibrium crystal structure and elasticity, and thereafter making theoretical prediction of minimum high-temperature lattice thermal conductivity basing on David Clarke's method for insulating materials. We highlight a new oxynitride ceramic, Y4Si2O7N2, with a low theoretical minimum thermal conductivity of 1.12 W·m−1·K−1. The theoretical result is further validated by experimental measurement of thermal conductivity of dense and bulk Y4Si2O7N2. The experimental thermal conductivity is 1.50 W·m−1·K−1 at 1300 K. Furthermore, thermal properties of Y4Si2O7N2 are investigated for evaluating its potential performances.

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