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

Hisanori Yamane; Koichiro Morita; Shunichi Kubota; Masahiko Shimada

doi:10.2497/jjspm.45.257

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 journal › Article › peer-review

Abstract

Single crystals of perovskite-type solid solution, K(Ta_xNb_1-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 language	English
Pages (from-to)	257-261
Number of pages	5
Journal	Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume	45
Issue number	3
DOIs	https://doi.org/10.2497/jjspm.45.257
Publication status	Published - 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

Access to Document

10.2497/jjspm.45.257

Cite this

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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.",

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AU - Morita, Koichiro

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AU - Shimada, Masahiko

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AB - 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.

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