SEMICONDUCTING CERAMIC COMPOSITIONS

摘要

Ceramic semiconducting compositions are provided herein in which compositions consist primarily of BaTiO3 and minor amounts of Bi2O3 and TiO2 in the proportions defined in FIG. 1 of the drawings under the Region described by line A-B-C-D-E-F-G and which compositions further contain 0.01 to 4 mol % of MnO2. The disclosure also provides for a method of producing compositions having the aforementioned proportions by mixing the oxides defined by FIG. 1 with MnO2, pressing the ceramic composition into the desired shape and then sintering the compositions in air, followed by reducing the compositions in a reducing atmosphere at elevated temperatures. Ceramics produced from the compositions described above exhibit a large capacitance among other desirably electrical properties and may be conveniently produced in a small compact form.