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Dielectric Constant of Barium Titanate Synthesized by Containerless Processing

Published online by Cambridge University Press:  01 February 2011

Jianding Yu ,
Paul-François Paradis ,
Takehiko Ishikawa  and
Shinichi Yoda
Jianding Yu
Affiliation:
Japan Aerospace Exploration Agency, ISS Science Project Office, 2–1–1 Sengen, Tsukuba, Ibaraki 305–8505, Japan
Paul-François Paradis
Affiliation:
Japan Aerospace Exploration Agency, ISS Science Project Office, 2–1–1 Sengen, Tsukuba, Ibaraki 305–8505, Japan
Takehiko Ishikawa
Affiliation:
Japan Aerospace Exploration Agency, ISS Science Project Office, 2–1–1 Sengen, Tsukuba, Ibaraki 305–8505, Japan
Shinichi Yoda
Affiliation:
Japan Aerospace Exploration Agency, ISS Science Project Office, 2–1–1 Sengen, Tsukuba, Ibaraki 305–8505, Japan
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Abstract

Containerless processing is an attractive synthesis technique that permits deep undercooling and provides the possibility to solidify the undercooled liquid into a selected phase, and to synthesize materials with novel properties. Spheroidal BaTiO3 samples with a diameter of approximately 2mm were solidified by containerless processing, using an electrostatic levitation apparatus. Single crystal hexagonal BaTiO3 and polycrystalline perovskite BaTiO3 were successfully synthesized at different undercoolings levels. An oxygen-deficient single crystal of hexagonal BaTiO3 obtained with this method, exhibited a giant permittivity higher than 100000, with a loss component tanδ of about 0.1 at room temperature. The permittivity showed weak temperature dependence in the 70 K to 300 K range, and a dramatic drop by 2 orders of magnitude below 70 K. In comparison, the polycrystalline perovskite BaTiO3 showed a permittivity of 4000 at room temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF10.4
Copyright
Copyright © Materials Research Society 2005

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