GeO_2及びB_2O_3添加によるBa_2Ti_9O_<20>誘電体セラミックスの低温焼成

概要

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Ba_2Ti_9O_<20> with GeO_2 and B_2O_3 was synthesized by an ordinary sintering method. Fired densities, dielectric constants and dielectric losses were measured. Ba_2Ti_9O_<20> containing B_2O_3 sintered at lower temperatures and Ba_2Ti_9O_<20> containing GeO_2 showed more excellent dielectric properties than a single phase of Ba_2Ti_9O_<20>. However, Ba_2Ti_9O_<20> containing GeO_2 and B_2O_3 showed no improvement in the sinterability and dielectric properties by low temperature firing. A two-step addition process, i. e. , separate addition of GeO_2 and B_2O_3 before and after the calcination, respectively, was effective in reducing the firing temperature without affecting the dielectric properties. XRD (X-ray diffraction) analysis and SEM (scanning electron microscope) observation were carried out on those samples. The sintering mechanism of Ba_2Ti_9O_<20> containing GeO_2 and/or B_2O_3 was proposed and the relationship between the microstructures and dielectric characteristics was discussed.
社団法人日本セラミックス協会の論文
1995-07-01