Dielectric Constant ofCr2O3Crystals

The dielectric constants of ${\mathrm{Cr}}_2$ ${\mathrm{O}}_3$ were measured at 25.5°C by a two-terminal substitution method on specimens cut from single crystal. The average dielectric constants thus obtained are: at 1 kc/sec parallel $a$ axis 13.3, parallel $c$ axis 11.9; at 2 Mc/sec parallel $a$ axis 13.0, parallel $c$ axis 11.8. The dielectric constant for either orientation increased approximately ${10}^{-3\mathrm{}}$ per 1°C in the temperature interval 298 to 325°K. A small anomaly was observed in the neighborhood of the Néel temperature.