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Dielectric Properties of Spherical Dielectric Oxide Powder and Its Ceramic-Polymer Composite

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Published 22 September 2005 Copyright (c) 2005 The Japan Society of Applied Physics
, , Citation Shenglei Che et al 2005 Jpn. J. Appl. Phys. 44 7107 DOI 10.1143/JJAP.44.7107

1347-4065/44/9S/7107

Abstract

A spherical filler of Ca0.65Sr0.35TiO3 dielectric oxide was prepared by flame fusion to improve the fluidity of ceramic-polymer compounds. The dielectric permittivity of the powder decreased by about 20% after melting-spheroidization but recovered after being heat-treated above 1150°C for 4 h. Composite dielectrics made from the spherical powder and a thermosetting polymer exhibited lower viscosity before hardening, thus making it possible to increase the filler concentration by over 5 vol %. A dielectric permittivity between 12 and 19 was achieved by adjusting the filler concentration of the spherical powder in the range of 40–70 vol %.

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10.1143/JJAP.44.7107