A. Koga et al., LOW-TEMPERATURE SINTERING OF BA2TI9O20 DI ELECTRIC CERAMICS WITH GEO2AND B2O3 ADDITIVES, Nippon Seramikkusu Kyokai gakujutsu ronbunshi, 103(7), 1995, pp. 685-689
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.