. The Bell System technical journal . mperaturecoefficient and power dissipation. Thermistors might be made by any method by which a semiconductor 172 BELL SYSTEM TECHNICAL JOURNAL could be shaped to definite dimensions and contacts applied. These meth-ods include: 1) melting the semiconductor, cooling and solidifying, cuttingto size and shape; 2) evaporation; 3) heating compressed powders of semi-conductors to a temperature at which they sinter into a strong compactmass and firing on metal powder contacts. While all three processes havebeen used, the third method has been found to be most gen
. The Bell System technical journal . mperaturecoefficient and power dissipation. Thermistors might be made by any method by which a semiconductor 172 BELL SYSTEM TECHNICAL JOURNAL could be shaped to definite dimensions and contacts applied. These meth-ods include: 1) melting the semiconductor, cooling and solidifying, cuttingto size and shape; 2) evaporation; 3) heating compressed powders of semi-conductors to a temperature at which they sinter into a strong compactmass and firing on metal powder contacts. While all three processes havebeen used, the third method has been found to be most generally usefulfor mass production. This method is similar to that employed in ceramicsor in powder metallurgy. At the sintering temperatures the powdersrecrystallize and the dimensions shrink by controlled amounts. The powderprocess makes it possible to mix two or more semiconducting oxides invarjnng proportions and obtain a homogeneous and uniform solid. It isthus possible to cover a considerable range of specific resistance and tem-.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
