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An increase in the area of the M\"ossbauer spectrum at the ferroelectric transition point has been observed in single crystals of potassium ferrocyanide trihydrate (KFCT), for spectra with the γ beam in a direction near the ferroelectric [101̄] axis. Also an anomalous change in the center shift appears at the transition point. This behavior is related to polarization effects, due to the presence of small quadrupole splitting in KFCT and to changes in the orientation of the electric field gradient caused by the onset of ferroelectricity.
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Montano et al. (1971) studied this question.
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