The dielectric properties of sintered aluminum oxide in the intermediate temperature range

A cell was designed and constructed to measure the electrical properties of solid dielectric specimens over the frequency range 10² to 10⁶ cps and in the temperature interval 25°C to 700°C. The cell, of the three-electrode guardring type, was calibrated in a resistance heated furnace containing air at a pressure of 10^-5 mm Hg. The associated electrical measuring devices included a General Radio Capacitance Bridge type 716-C, a General Radio Guard Circuit type 716-P4 and supplementary generator and detector equipment.