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The lattice polarization in oxides of the perovskite family is demonstrated to give rise to symmetry breaking of one‐electron orbitals at F centers. This can provide an explanation of recent experiments on paraelectric KTaO3 where, by the second harmonic generation method, approximately 1018 cm−3 dipole centers were found, the concentration of which depends on reduction and oxidation processes.
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Prosandeyev et al. (1995) studied this question.
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