Domain structures in perovskite-type lanthanum magnesium titanate ceramics

Erick Rop Kipkoech, Feridoon Azough, Robert Freer

    Research output: Contribution to journalArticlepeer-review

    Abstract

    La(Mg 1/2Ti 1/2)O 3 ceramics were prepared using a conventional solid-state reaction route. X-ray diffraction analysis revealed that La(Mg 1/2Ti 1/2)O 3 possesses a distorted perovskite structure consisting of both in-phase and anti-phase tilting accompanied by anti-parallel shifting of La 3+ cation. Superlattice reflections, indicative of 1:1-type ordering of Mg 2+ and Ti 4+ cations in the octahedral sites, were observed. The crystal symmetry was deduced to be monoclinic with P2 1/n space group (No. 14). Transmission electron microscopy analysis revealed two types of twin domains, classified according to the symmetry elements relating adjacent domains. Twin domains with specific orientations, related by mirror operations along {112} and (110) planes, were identified. La(Mg 1/2Ti 1/2)O 3 exhibited a high density of dislocations that interact with the twin boundaries resulting in incoherent twin interfaces. In addition, two morphologically distinct anti-phase domains were observed resulting from (i) off-center displacement of the La 3+ cations, and (ii) 1:1 ordering of the B-site sublattice.
    Original languageEnglish
    Pages (from-to)768-772
    Number of pages4
    JournalJournal of the American Ceramic Society
    Volume88
    Issue number3
    DOIs
    Publication statusPublished - 2005

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