Journal of the Korean Physical Society

, Volume 66, Issue 9, pp 1355–1358 | Cite as

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

  • E. Tanaka
  • Y. Ishii
  • H. Tsukasaki
  • S. Mori
  • M. Osada
  • H. Taniguchi
  • Y. Sato
  • Y. Kubota


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.


Trydimyte structure BaAl2O4 Diffuse scattering 


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Copyright information

© The Korean Physical Society 2015

Authors and Affiliations

  • E. Tanaka
    • 1
  • Y. Ishii
    • 1
  • H. Tsukasaki
    • 1
  • S. Mori
    • 1
  • M. Osada
    • 2
  • H. Taniguchi
    • 3
  • Y. Sato
    • 4
  • Y. Kubota
    • 4
  1. 1.Department of Materials ScienceOsaka Prefecture UniversitySakai, OsakaJapan
  2. 2.National Institute of Materials Science (NIMS)Tsukuba, IbarakiJapan
  3. 3.Department of PhysicsNagoya UniversityNagoyaJapan
  4. 4.Department of Physical ScienceOsaka Prefecture UniversitySakai, OsakaJapan

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