Low Frequency Characteristics of TiO2(Rutile)–Glass Thick Films

[摘要] An analysis is made of the low-frequency characteristics of the permittivityε′and of tanδof a thick-film insulatorcontaining rutile grains bonded with an amorphous glass. The appearance of dielectric relaxation associated with amaximum of tanδ, as well as characteristic Debye dispersions of the electric permittivity is observed. The relaxationtime does not depend on the rutile concentration in the dielectric. An equivalent circuit describing the behaviour ofa capacitor with such an insulator in the low frequency range is suggested. The experimental results are shown to beconsistent with an analysis based on the assumption that a titanium ion relaxation process occurs in the rutile grains. Innormal ambient conditions the influence of this kind of polarization disappears at frequencies higher than 102Hz;ε′and tanδthen change insignificantly and the value of tanδis conditioned by the hopping mechanism of conductivity in the glass and in rutile.

[学科分类] 工程和技术（综合）