ESR spectra of Gd3+ probe have been studied in the range of ferroelectric phase transition T C =451 K in lead germanate Pb 5 Ge 3 O 11 . Measurements of ESR line position have shown that local order parameter behaves in accordance with the mean field theory approach in a broad (∼150 K) temperature interval below T C . Anomalous line width broadening observed around T C can be associated with a quasi-elastic central peak component of excitation spectrum, observed earlier using a light scattering experiment and attributed to static symmetry-breaking defects.

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