Abstract
The results of experimental studies of the temperature dependence of the low-frequency permittivity e 0 and the loss tangent taδ of nominally undoped and doped single crystals of strontium titanate at T = 10–300 K are given. The samples were doped with ions of iron-group metals (V, Mn, Fe, Co) and/or ions of rare earth metals (Pr, Nd, Sm, Tm) with concentrations of 10−3−5 × 10−1 at %. Anomalous temperature dependences e0T and tanδ(T) were found for a number of samples. The anomalies found were attributed to the violation of stoichiometry of the single crystals under study and the transition of some fraction of Ti4+ ions to the Ti3+ state.
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