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Structural changes and microstructures of Ba1-x Sr x Al2O4 for 0 < x < 0.4

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Abstract

We have investigated the structural changes and the microstructures of Ba1-x Sr x Al2O4 for 0 < x < 0.4 by using transmission electron microscope (TEM) and synchrotron radiation powder X-ray diffraction experiments. The TEM experiments revealed the existence of a structural phase boundary at approximately x = 0.1, at which the superlattice reflection spots at the 1/2 0 0 -type positions change into diffuse streaks along three equivalent <110> directions in the hexagonal structure. In addition, real-space images of Ba1-x Sr x Al2O4 for 0 < x < 0.4 reveal that BaAl2O4 should be characterized as a modulated structure with triple-q modulation vectors along the <110> directions and on the other hand, Ba1-x Sr x Al2O4 for 0.1 < x < 0.4 be characterized as an intermediate (precursor) state with a rigid unit mode due to structural instability. These experimental results implied that the partial substitution of Sr2+ for Ba2+ should suppress a structural instability due to the AlO4 tetrahedral network and decrease the structural phase transition temperature.

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Authors and Affiliations

  1. Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan

    E. Tanaka, Y. Ishii, H. Tsukasaki & S. Mori

  2. National Institute of Materials Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan

    M. Osada

  3. Department of Physics, Nagoya University, Nagoya, 464-8603, Japan

    H. Taniguchi

  4. Department of Physical Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan

    Y. Sato & Y. Kubota

Authors
  1. E. Tanaka
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  2. Y. Ishii
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  3. H. Tsukasaki
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  4. S. Mori
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  5. M. Osada
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Correspondence to Y. Ishii.

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Tanaka, E., Ishii, Y., Tsukasaki, H. et al. Structural changes and microstructures of Ba1-x Sr x Al2O4 for 0 < x < 0.4. Journal of the Korean Physical Society 66, 1355–1358 (2015). https://doi.org/10.3938/jkps.66.1355

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  • DOI: https://doi.org/10.3938/jkps.66.1355

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