LOW-TEMPERATURE SINTERING OF BA2TI9O20 DI ELECTRIC CERAMICS WITH GEO2AND B2O3 ADDITIVES

Ba2Ti9O20 with GeO2 and B2O3 was synthesized by an ordinary sintering method, Fired densities, dielectric constants and dielectric losses we re measured, Ba2Ti9O20 containing B2O3 sintered at lower temperatures and Ba2Ti9O20 containing GeO2 showed more excellent dielectric propert ies than a single phase of Ba2Ti9O20, However, Ba2Ti9O20 containing Ge O2 and B2O3 showed no improvement in the sinterability and dielectric properties by low temperature firing. A two-step addition process, i,e ,, separate addition of GeO2 and B2O3 before and after the calcination , respectively, was effective in reducing the firing temperature witho ut affecting the dielectric properties, XRD (Xray diffraction) analysi s and SEM (scanning electron microscope) observation were carried out on those samples, The sintering mechanism of Ba2Ti9O20 containing GeO2 and/or B2O3 was proposed and the relationship between the microstruct ures and dielectric characteristics was discussed.