Characteristic features of the modulated structure appearing in the multiferroic material Bi1-xSmxFeO3 around x = 0.15

Masashi Nomoto, Takumi Inoshita, Yasuhide Inoue, Yoichi Horibe, Yasumasa Koyama

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

    1 Citation (Scopus)

    Abstract

    In Bi1-xSmxFeO3 (BSFO) having the multiferroic BiFeO3 as an end material, when the Sm content increases from x = 0, it has been reported that the ferroelectric-R3c state is changed into the paraelectric-Pnma state around x = 0.14. The R3c/Pnma state boundary around x = 0.14 can be regarded as a temperature-independent morphotropic-phase boundary (MPB). The notable feature in BSFO is that, in addition to these two states, the antiferroelectric PbZrO3-type state was also found in the vicinity of the MPB. Although the PbZrO3-type state appears as a modulated structure, its detailed features have not been understood yet. We have thus examined the crystallographic features of prepared BSFO samples around x = 0.14, mainly by transmission electron microscopy. The PbZrO3-type state was confirmed to be present in samples with x = 0.15 on the basis of x-ray powder diffraction profiles measured from prepared samples at 300 K. On the other hand, the observation made by transmission electron microscopy indicated that the state for x = 0.15 is characterized by a coexistence state consisting of the ferroelectric-R3c and antiferroelectric PbZrO3-type states. In particular, the crystal structure of the PbZrO3-type state could be identified as a modulated structure with two transverse modulation waves, whose wave vectors are given by qi = [1/2 0 0]o and q2 = [0 1/2 0]o in the orthorhombic-Pnma notation. In addition, eigenvectors of these two transverse waves were also determined to be parallel to the same [001]o direction.

    Original languageEnglish
    Title of host publicationTHERMEC 2016
    PublisherTrans Tech Publications Ltd
    Pages1393-1398
    Number of pages6
    Volume879
    ISBN (Print)9783035711295
    DOIs
    Publication statusPublished - 2017
    Event9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016 - Graz, Austria
    Duration: 2016 May 292016 Jun 3

    Publication series

    NameMaterials Science Forum
    Volume879
    ISSN (Print)02555476

    Other

    Other9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016
    CountryAustria
    CityGraz
    Period16/5/2916/6/3

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    Keywords

    • Antiferroelectric state
    • BiSmFeO
    • Multiferroic material
    • Transmission electron microscopy

    ASJC Scopus subject areas

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

    Cite this

    Nomoto, M., Inoshita, T., Inoue, Y., Horibe, Y., & Koyama, Y. (2017). Characteristic features of the modulated structure appearing in the multiferroic material Bi1-xSmxFeO3 around x = 0.15. In THERMEC 2016 (Vol. 879, pp. 1393-1398). (Materials Science Forum; Vol. 879). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.879.1393