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Anisotropic thermal expansion in wurtzite-type crystals

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Abstract

The temperature dependence of the lattice parameters of six wurtzite-type crystals, BeO, AlN, GaN, ZnO, CdSe, and CdS, has been measured by X-ray powder diffractometry. The thermal expansion changes nonlinearly with temperature and is anisotropic; the expansion along the a-axis is larger than that along the c-axis (more than 50% larger in ZnO, CdS and CdSe), resulting in a decrease of the c/a ratio with increasing temperature. The calculated Grüneisen parameters range between 0.27 and 1.45 and have a positive correlation with the bulk moduli. The anisotropic thermal expansion is associated with the anisotropies of both elasticity and anharmonicity.

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Authors and Affiliations

  1. Department of Materials Science, Faculty of Engineering, Nagasaki University, Bunkyo-cho, Nagasaki, 852-8521, Japan

    H. Iwanaga

  2. UBE Scientific Analysis Laboratory, Kogushi, Ube, 755-8633, Japan

    A. Kunishige

  3. Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Science University of Tokyo, Yamazaki, Noda, Chiba, 278-8510, Japan

    S. Takeuchi

Authors
  1. H. Iwanaga
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  2. A. Kunishige
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  3. S. Takeuchi
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Iwanaga, H., Kunishige, A. & Takeuchi, S. Anisotropic thermal expansion in wurtzite-type crystals. Journal of Materials Science 35, 2451–2454 (2000). https://doi.org/10.1023/A:1004709500331

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