Abstract
Abstract The dielectric properties of CaF2 single crystals were investigated in the temperature range from room temperature to 773 K and the frequency range of 50 Hz–10 MHz. A Debey-like relaxation and a relaxor-like dielectric anomaly were observed. Raman spectrum and the differential scanning calorimeter measurement revealed the coexistence of native defects of fluorine vacancies ( V F ) and interstitial fluorine ions ( F ′ i ) and external defect of oxygen ions. Impedance analysis showed that the Debey-like relaxation results from the mobility of V F , while the relaxor-like behavior is associated with the relaxation caused by complexes of O ″ − V F .
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