添加物で変性した亜鉛タンタル酸バリウム-マグネシウムタンタル酸バリウムセラミックスの誘電特性に関する研究

概要

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Present study reports the preparation and dielectric properties of (1-χ) Ba(Zn_<1/3>Ta_<2/3>)O_<3-χ>Ba(Mg_<1/3>Ta_<2/3>)O_3 ceramics (χ is mole fraction and χ=0-1) modified with MnO_2,SiO_2 and Bi_2O_3. The sintered densities and dielectric properties of the base composition were improved markedly through selection of additives. Addition of small amounts of SiO_2 or MnO_2 yielded a high density ceramics for all base compositions. High density (98% of theoretical density) and high relative dielectric constant (33 at 1MHz) were obtained by addition of 0.1wt% SiO_2 for the base composition of χ=0.5. This ceramics also showed superior dielectric properties at microwave frequencies and a high relative dielectric of 27,high Q of 10430 at 12.944 GHz and low temperature coefficient of resonant frequency (τ_f) of 1.95ppm/℃ at a temperature range from -60° to 80℃ were obtained. However, larger addition of MnO_2,SiO_2 and Bi_2O_3 lowered the sintered densities and dielectric properties.
湘南工科大学の論文
1998-03-25