Dielectrics havin g co mpo itions in the system 3CaO:TiO,-BaTi03-TiO, were matured at 1,260° to 1,500° C. Data are given for the comp ositions, heat-treatme n ts, absorp tion, shrinkage, and for K, the die lectric constant, and Q, t he reciprocal of the power factor, at 25° C for fr equencies of 50, 1,000 and 20,000 kilocycles per second and for 3,000 megacycles per second when ]( is not g reater than 50.Values of K were a lso determin ed at 1 megacycle per second for variou tem peratures from -60° to + 85° C. Lowest valu e. of Q (and highest of K ) were associated wit h specim ens of high bari a co ntent.Linear t he rmal expansion (25° to 700° C) ra nged from 0.65 to 0.87 percent.The pecim ens of some compositions were un stable and cha nged in 1C and Q values with time.5. 0 n 3 1. 100
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Bunting et al. (1949) studied this question.