| 摘要 |
<p>PURPOSE:To obtain a varistor suitable for low voltage by a method wherein high-speed noise is effectively absorbed by diffusing the glassy oxide such as Bi, Pb, Zn, Cu, Na, B, Si and the like into a crystal grain boundary. CONSTITUTION:A semiconductor porcelain is mainly composed of SrTiO3, and it contains at least a kind of 0.05 to 1wt.% selected from the group consisting of oxides such as a rare-earth element, Nb, W and Ta as a semiconductivity- giving agent. A glassy oxide is diffused into the crystal grain boundary of the semiconductor porcelain. A composite functional element is formed using the semiconductor porcelain. As a result, an excellent non-linear of voltage can be accomplished as in the state wherein the large electrostatic capacitance of an SrTiO3 semiconductor porcelain is being maintained. As a result, high speed noise can be absorbed effectively, and a varistor suitable for low voltage can also be obtained.</p> |
