Features of the ferroelectric rhombohedral state in Ba(Ti<inf>1-x</inf>Zr<inf>x</inf>)O<inf>3</inf> having the simple perovskite structure

Hirofumi Tsukasaki, Shigeo Mori, Yasumasa Koyama

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The crystallographic features of the ferroelectric rhombohedral (FR) state in Ba(Ti<inf>1-x</inf>Zr<inf>x</inf>)O<inf>3</inf> (BTZ) have been investigated between 300 and 450K mainly by transmission electron microscopy, with the help of the failure of Friedel-s law in electron diffraction. It was found that regions having PC- and PC-polarization components in the FR state were separately observed in dark field images, where the subscript PC denotes the paraelectric state. Based on the positional correspondence between regions with PC and PC components, the ferroelectric state for 0.11 ≥ x ≥ 0.17 could be explained as the nanometer-scale coexistence state consisting of fine FR and ferroelectric-tetragonal (FT) stripes, instead of the single FR state. In-situ observation also revealed that, when the temperature was lowered from the PC state, nanometer-scale polar (NP) regions with PC and PC components in the PC state were, respectively, coalesced into a banded structure with an average size of about 200 nm, and into fine stripes with that of about 30 nm. It is thus understood that the difference between the behaviors of the coalescences of NP regions with PC and PC components is directly associated with the appearances of both a complicated domain structure for x = 0.09 and the nanometer-scale coexistence state for 0.11 ≥ x ≥ 0.17.

    Original languageEnglish
    Pages (from-to)913-919
    Number of pages7
    JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
    Volume123
    Issue number1441
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Ba(Ti<inf>1-x</inf>Zr<inf>x</inf>)O<inf>3</inf>
    • Domain structure
    • Ferroelectrics
    • Polar nanometer-sized region
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry
    • Chemistry(all)
    • Condensed Matter Physics

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