| 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 kind or more of Nb2O5, Ta2O5 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 Ti by Nb, Ta or replacement of Sr by Ba, Cu, Mg produces distortion in crystal structure and 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. |
