Abstract

Based on the data of ultrasonic studies and on the temperature behavior of the absorption spectra, a study of the phase diagram of the crystals CsDy1−xGdx(MoO4)2 is made and the structural distortions occurring as a result of the pseudo-Jahn–Teller effect are discussed. It is shown that in the presence of impurities there are several lines of phase transitions on the x–T phase diagram. It is established that one of the phase transitions these found is essentially of a magnetoelastic origin.

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