Abstract
CuCrO2 ceramics were prepared by solid-state reaction method. Low-temperature (10–320 K) dielectric properties were investigated in the frequency range of 102–106 Hz. Colossal dielectric constant behavior composed of two thermally activated relaxations was observed. The low-temperature relaxation (R1) occurring around 125 K with an activation energy of 0.21 eV was ascribed to be a dipolar relaxation caused by defect dipoles of OHO•−Cr3+. The high-temperature relaxation (R2) appearing around 200 K with an activation energy of 0.26 eV was argued to be a Maxwell-Wagner relaxation originating from humidity sensitivity.
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