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Abstract
In this work the results of temperature researches of piezooptic constants, describing changes of path difference, and relaxation of piezooptic effect for TGS + Cr3 + crystals are presented. The anomalies in the field of phase transition are explained and designed. The features of photoelasticity relaxations are analysed. It is specified that the anomalous of the dependence of relative amplitude β13(T) has such character as well as the dependence of β13 0(T).