Abstract

An analysis is given of the following two questions; the sagging of the Mössbauer-effect probability which has been observed in different matters at phase-transition points such as magnet-parmagnet, ferroelectric-paraelectric and reorientational magnetic transitions; the diminishing of this probability resulting from irradiation of solid. It is shown that the diminishing of the Mössbauer-effect probability in all these cases can be explained by a common reason — the heterogeneity of the matter. Calculations made for the mixture magnet-paramagnet and for a solid with regions of disorder show a nice agreement with experiment.

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