| 摘要 |
PURPOSE:To lower a resistivity by a method wherein a mixture composed of an element to form a semiconductor and of barium titanate is baked temporarily in the air to form a barium titanate-based composition, this composition is heat-treated in a neutral atmosphere and/or a reducing atmosphere and is molded, a molded substance is reduced and baked in a neutral atmosphere and/or a reducing atmosphere and a heating and oxidation treatment is executed. CONSTITUTION:A mixture composed of an element to form a semiconductor such as Y, La, Nb or the like and of barium titanate is baked temporarily in the air to form a barium titanate-based semiconductor composition. This composition is heat-treated in a neutral atmosphere and/or a reducing atmosphere; it is crushed, granulated and molded; after that, a molded substance is baked in a neutral atmosphere and/or a reducing atmosphere; after that, a heating and oxidation treatment is executed. Thereby, it is possible to obtain a positive temperature coefficient semiconductor porcelain whose resistivity at room temperature is low and which is provided with an excellent PTC characteristic. |
