Variable Temperature Dielectric Cell of Wide Frequency Range for Solids and Liquids

A cell was developed with which power factor and dielectric constants of solids and liquids can be accurately and conveniently measured from −25°C to +150°C and 0 to 200 Mc. It uses 7 cc of liquid or a solid disk up to 1.5 in. in diameter and up to 150 mils thick. A rapid means of controlling temperature with a circulating oil stream is provided, with a view toward automatic recording vs. temperature at constant frequency. Thermal expansion of solids may be simultaneously recorded. Fringing errors for solids may be eliminated by using a sample of smaller diameter than the electrodes.