Gigantic electrostrain in duplex structured alkaline niobates

Si Young Choi, Soon Jong Jeong, Dae Su Lee, Min Soo Kim, Jae Shin Lee, Jeong Ho Cho, Byoung Ik Kim, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    67 Citations (Scopus)

    Abstract

    We demonstrate that an exceptionally large strain can be induced in CaZrO 3-modified alkaline-niobates by electric fields. The maximum induced strain of our niobate-based ceramics could reach more than 1,000 pm/V, which is a much higher value than that of commercial soft PZT ceramics. Atomic-scale annular bright-field (ABF) and annular dark-field (ADF) scanning transmission electron microscopy (STEM) directly revealed that individual single grains were composed of an electrically duplex core-shell structure; relaxor-like cores and paraelectric shells. Based on this ABF STEM analysis along with electrical measurements, a plausible mechanism explaining the high strain effect in the present work was suggested. This new material offers an unprecedented opportunity to produce efficient Pb-free piezoelectrics for applications that require large electrostrictive motion.

    Original languageEnglish
    Pages (from-to)3363-3369
    Number of pages7
    JournalChemistry of Materials
    Volume24
    Issue number17
    DOIs
    Publication statusPublished - 2012 Sep 11

    Keywords

    • actuator
    • core/shell
    • electric field induced strain
    • electron microscopy
    • perovskites

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Materials Chemistry

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