Dielectric constant and loss of some stannates and cerates

The dielectric constant and loss of sintered disks of some stannates and cerates were measured against frequency and temperature in the ranges 100 cps −1 Mc and −196°C to about 400°C. The values of K and tan 5 measured on several specimens of each oxide at room temperature and 1 Mc are given in the following-table, with no correction for ceramic density.