Abstract
The dielectric properties of LaF3 single crystals were investigated in the temperature range from 110 to 773 K and the frequency range from 100 Hz to 10 MHz. Two thermally activated relaxations (R1 and R2) and a dielectric anomaly (A) were observed. The lower temperature relaxation (R1) was ascribed to a polaronic relaxations due to fluorine ions diffusion within the F1 sublattice and fluorine ions hopping in F1 sublattice. The higher temperature relaxation (R2) is Maxwell–Wagner relaxation due to the blocking of electrodes associated with the ionic exchange between F1 and F2,3 sublattices and among the three nonequivalent sublattices. The anomaly appearing in the highest temperature range is related to the inductive effect arising from the coupled electron-ionic inductive response.
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