Applied Physics A

, Volume 74, Supplement 1, pp s1660–s1663 | Cite as

Neutron powder diffraction study of the rhombohedral to cubic phase transition in the series La1-xPrxAlO3

  • B.J. Kennedy
  • C.J. Howard
  • A.K. Prodjosantoso
  • B.C. Chakoumakos

Abstract.

Neutron powder diffraction has been used to examine the structural changes of the rare-earth aluminates La1-xPrxAlO3 over a wide range of temperatures. At room temperature the aluminates adopt the rhombohedral perovskite structure in space group R\(\)c. In all cases heating the sample results in a transition to cubic, the transition temperature increasing linearly with Pr content. The rhombohedral structure is characterised by rotation of the oxygen atom octahedra about the threefold axis. The maximum rotation angle also increases linearly with Pr content.

PACS: 61.12Ld; 61.50K; 61.66Fn 

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • B.J. Kennedy
    • 1
  • C.J. Howard
    • 2
  • A.K. Prodjosantoso
    • 1
  • B.C. Chakoumakos
    • 3
  1. 1.The Centre for Heavy Metals Research, School of Chemistry, The University of Sydney, Sydney, NSW 2006, AustraliaAU
  2. 2.Australian Nuclear Science and Technology Organisation, PMB 1, Menai NSW 2234, AustraliaAU
  3. 3.Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USAUS

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