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Effects of heating rate on sintering of alkoxide-derived BaTi5O11 powder

Published online by Cambridge University Press:  29 June 2016

Toshimi Fukui ,
Chihiro Sakurai  and
Masahiko Okuyama
Toshimi Fukui
Affiliation:
Colloid Research Institute, 350-1 Ogura, Yahata-higashi-ku, Kitakyushu 805, Japan
Chihiro Sakurai
Affiliation:
Colloid Research Institute, 350-1 Ogura, Yahata-higashi-ku, Kitakyushu 805, Japan
Masahiko Okuyama
Affiliation:
Colloid Research Institute, 350-1 Ogura, Yahata-higashi-ku, Kitakyushu 805, Japan
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Abstract

The effects of heating rate on the sintering of BaTi5O11 ceramics from an alkoxide-derived powder were investigated, and the microwave properties were measured. Density and the crystalline phase of the sintered bodies varied with heating rate. Density increased with an increase in heating rate up to 30 °C/min and decreased at one exceeding 30 °C/min. BaTi5O11 ceramics with >99% theoretical density were obtained by sintering at 1120 °C for 48 h with a heating rate at 30 °C/min. The sintering with a heating rate at 100 °C/min resulted in a decomposition of BaTi5O11 to Ba2Ti9O20 and rutile that hindered sintering. The dielectric constant εr and Q volume, neither sensitive to microstructure or the crystalline phase, were 42 and ca. 6100 at 9.7 GHz, respectively. The temperature coefficient of resonant frequency τf was 39.3 ppm/°C at 7 GHz.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 192 - 196
Copyright
Copyright © Materials Research Society 1992

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References

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