Frequency spectra of in at various temperatures with an Arrhenius (a) and non-Arrhenius (b) behaviors.
Relaxation frequency as a function of in (filled stars), (empty stars), and in (empty squares) and in (empty circles). The solid lines are least-square fit to Eq. (6) with relaxation attributed to the off-center ions or to polaronlike defects or and to . The best-fit parameters are presented in Table I.
Relaxation parameters for off-center ions and polaron like defects .
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