Re-examination of the structure of Sr 2(MgTe)O 6 double perovskite

R. Ubic, S. Letourneau, S. Thomas, G. Subodh, M. T. Sebastian

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5 Scopus citations

Abstract

Sr 2MgTeO 6 powders and pellets were prepared by a solid-state ceramic route. The structure and microstructure were investigated using x-ray diffraction, transmission electron microscopy, and scanning electron microscopy methods. A structural inconsistency was discovered between the pseudocubic tetragonal structure (I4/m) and the pseudotetragonal monoclinic P2 1/n structure of Ca 2MgTeO 6, both of which have previously been reported. Rather than undergoing an antiphase-to-in-phase tilt transition along the long axis, a more probable untilted-to-in-phase tilt transition was found, lowering the symmetry of Sr 2MgTeO 6 to monoclinic, I2/m. Additionally, slight breaks in the fourfold symmetry expected in the <001> (tetragonal) orientations observed in electron diffraction patterns support the lowering of symmetry.

Original languageEnglish
Pages (from-to)49-56
Number of pages8
JournalJournal of the Australian Ceramic Society
Volume47
Issue number2
StatePublished - 2011

Keywords

  • Electroceramics
  • Electron microscopy
  • Perovskite

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