Fabrication of composition-graded K(Nb,Ta)O3 crystals and their dielectric properties

H. Yamane, K. Morita, M. Shimada

    Research output: Contribution to journalConference articlepeer-review

    Abstract

    Composition-graded crystals of K(Ta,Nb)O3 solid solution were prepared by non-equilibrium cooling of melts. The size of the crystals was 0.5-2.0 mm. The texture, composition distribution and temperature dependence of dielectric properties were characterized by X-ray diffraction, electron-microprobe analysis, polarizing optical microscopy and impedance analysis. The core was rich in Ta content which decreased gradually in the crystals from the core to the margin, while Nb content increased gradually from the core to the margin. The dielectric properties reflected the composition gradient which depended on the cooling process. The crystals obtained with a higher cooling rate exhibited smaller temperature dependence of dielectric constant.

    Original languageEnglish
    Pages (from-to)549-554
    Number of pages6
    JournalMaterials Science Forum
    Volume308-311
    Publication statusPublished - 1999 Jan 1
    EventProceedings of the 1998 5th International Symposium on Functionally Graded Materials, FGM '98 - Dresden, Germany
    Duration: 1998 Oct 261998 Oct 29

    Keywords

    • Composition Gradient
    • Dielectric Materials
    • Non-Equilibrium Cooling
    • Perovskite-Type Ferroelectrics

    ASJC Scopus subject areas

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

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