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Preparation of Ba(Mg1/3Nb2/3)O3 ceramics as microwave dielectrics through alkoxide-hydroxide route

Published online by Cambridge University Press:  31 January 2011

Toshimi Fukui ,
Chihiro Sakurai  and
Masahiko Okuyama
Toshimi Fukui*
Affiliation:
Colloid Research Institute, 350-1 Ougura, Yahata-higashi-ku, Kitakyushu 805, Japan
Chihiro Sakurai*
Affiliation:
Colloid Research Institute, 350-1 Ougura, Yahata-higashi-ku, Kitakyushu 805, Japan
Masahiko Okuyama*
Affiliation:
Colloid Research Institute, 350-1 Ougura, Yahata-higashi-ku, Kitakyushu 805, Japan
*
a)Present address: Technical Research Center, Krosaki Corporation, 1-1 Higashihama, Yahata-nishi, Kitakyushu 806, Japan.
b)Present address: Advanced Materials & Research Laboratory, Nippon Steel Corporation, 1618 Ida, Nakahara, Kawasaki 211, Japan.
c)Present address: Research and Development Center, NGK Spark Plug Corporation Ltd., 2808 Iwasaki, Komaki 485, Japan.
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Abstract

Ba(Mg1/3Nb2/3)O3 powders were prepared through an alkoxide-hydroxide route. Their sintering behavior and crystallographic structures were investigated, and microwave properties of the obtained ceramics were also measured. Crystalline powder with approximately 0.5 μm in particle size was obtained by the reaction of Ba(OH)2−8H2O and Mg–Nb double alkoxide, Mg[Nb(OEt)6]2, in ethanol-acetone solution. A powder compact sintered at 1350 °C for 2 h showed >99% of relative density and >0.9 of ordering degree of the B site. The Q value of Ba(Mg1/3Nb2/3)O3 ceramics was sensitive to sintering conditions due to the formation of an impurity phase. The ceramics sintered at 1350 °C for 5 h showed a dielectric constant ∊ of 32 and Q value of > 13 000 at 11.8 GHz. The temperature coefficient of resonant frequency τf was 23.9 ppm/°C at 9.8 GHz.

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Articles
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Journal of Materials Research , Volume 7 , Issue 7 , July 1992 , pp. 1883 - 1887
Copyright
Copyright © Materials Research Society 1992

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