Abstract
This paper reports on the first study in K3Na(CrO4)2 crystals of Raman spectra within a broad temperature interval of 4–300 K. The study has revealed significant variations in the intensity and shape of the Raman lines at T = 150 K; a group theory analysis has revealed that the structural phase transition in this ferroelastic proceeds in two stages through an intermediate phase: \(P\bar 3m1 \to C2/m \to C2/c\).
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