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
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

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