Crystallographic features of the relaxor state in the mixed ferroelectric system Ba(Ti1-xZrx)O3

Hirofumi Tsukasaki, Yasuhide Inoue, Yasumasa Koyama

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The relaxor state has been found in the mixed ferroelectric system Ba(Ti1-xZrx)O3 around x = 0.35. To understand the nature of the relaxor state, the crystallographic features of the paraelectric (PC), ferroelectric, and relaxor states for 0.15 ≤ x ≤ 0.40 have been investigated mainly by transmission electron microscopy. It was found that a microstructure of the ferroelectric state for 0.15 ≤ x ≤ 0.28 consisted of banded structures with boundaries parallel to the {110}PC and {100}PC planes. Based on the Sapriel theory concerning ferroelastic transitions, it was understood that the banded structures were consistent with domain structures in the ferroelectric rhombohedral (FR) state having a polarization vector parallel to one of the <111> PC directions. With the help of the failure of Friedel's law in diffraction, furthermore, polar regions having <001>PC and <110>PC components of a <111>PC polarization vector were also found to be separately observed in the PC and relaxor states as well as the FR state. Then, in-situ observation for 0.29 ≤ x ≤ 0.40 made in this study indicated that the PC and relaxor states consisted of polar nanometer-sized regions having these two components. Based on this, the relaxor state in BTZ can be identified as an assembly of polar nanometer-sized regions, which were produced by the suppression of the (PC→FR) ferroelectric transition on cooling.

    Original languageEnglish
    Title of host publicationMaterials Science Forum
    PublisherTrans Tech Publications Ltd
    Pages2400-2405
    Number of pages6
    Volume783-786
    ISBN (Print)9783038350736
    Publication statusPublished - 2014
    Event8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013 - Las Vegas, NV
    Duration: 2013 Dec 22013 Dec 6

    Publication series

    NameMaterials Science Forum
    Volume783-786
    ISSN (Print)02555476

    Other

    Other8th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2013
    CityLas Vegas, NV
    Period13/12/213/12/6

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    Keywords

    • Domain structure
    • Polar nanometer-sized region
    • Relaxor ferroelectrics
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering
    • Mechanics of Materials

    Cite this

    Tsukasaki, H., Inoue, Y., & Koyama, Y. (2014). Crystallographic features of the relaxor state in the mixed ferroelectric system Ba(Ti1-xZrx)O3 In Materials Science Forum (Vol. 783-786, pp. 2400-2405). (Materials Science Forum; Vol. 783-786). Trans Tech Publications Ltd.