摘要 |
PURPOSE:To enable elimination of noises at low-voltage by specifying ceramic composition. CONSTITUTION:SrTiO3 containing an excess of Si so that the Si-Ti ratio may show 1.001<=Sr/Ti<=1.05 and further a Li-P total of 0.007-0.500wt.% is mixed with a kinds or more of CeO2, Y2O3, La2O3 at 0.1-2.0mol%, a kind or more of SiO2, CuO, CO2O3, MnCO3 at 0.1-2.0mol%, and a kind or more of BaO, CaO, MgO at 0.1-1.0mol%. An excess of Sr or of Ti increases lattice defects and promotes semiconductivity. Further, replacement of Sr by Ce, Y, La or by Ba, Ca, Mg promotes semiconductivity. Next, addition of SiO2, CuO, CO2O3, MnCO3 increases resistance in the grain boundary and develops varistor characteristics. This can protect circuits from noises and static electricity. |