Preparation and Dielectric Properties of Composition-Graded K(Ta, Nb)O3 Single Crystals

Hisanori Yamane, Koichiro Morita, Shunichi Kubota, Masahiko Shimada

Research output: Contribution to journalArticlepeer-review

Abstract

Single crystals of perovskite-type solid solution, K(TaxNb1-z)O3, having composition gradient were prepared by non-equilibrium cooling from a melt with the composition x = 0.3. The size of the crystals was 1∼2 mm. Electron microprobe analysis revealed that Ta content was rich in the core region of the crystals and decreased gradually to the edges with increasing Nb content. The composition gradient depended on cooling procedure. The dielectric constant measured at 500 kHz was in the range from 1000 to 4000 at temperatures from 290 to 720 K. The temperature dependence of dielectric constant reflected the composition gradient in the crystals.

Original languageEnglish
Pages (from-to)257-261
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume45
Issue number3
DOIs
Publication statusPublished - 1998 Mar

Keywords

  • Dielectric constant
  • Functionally graded materials
  • Perovskite-type structure
  • Single crystal

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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