Incomplete structural phase transition and lattice destruction in Sr1-xLaxTiO3+δ

M. Arao, Yasumasa Koyama, Y. Inoue

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    Abstract

    In situ observation of the R3c-to-Pbnm structural phase transition in Sr0.5La0.5TiO3+δ has been made mainly by transmission electron microscopy to understand features of the transition in samples with relatively large nonstoichiometry of more than δ=0.05. Instead of the appearance of the superlattice reflection spot exhibiting the phase transition, only the diffuse maximum appears at q = 1/2〈110〉 and q = 1/2〈100〉 in the simple cubic reciprocal lattice below a transition temperature Ts of about 190 K. The subsequent aging below Ts also results in the local lattice destruction. These features found in the samples with large nonstoichiometry should be caused by both the nonstoichiometry and the strain field induced by the change in the crystal system in the transition.

    Original languageEnglish
    Pages (from-to)2759-2763
    Number of pages5
    JournalJournal of Applied Physics
    Volume86
    Issue number5
    Publication statusPublished - 1999 Sep

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physics and Astronomy (miscellaneous)

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