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Brillouin spectroscopy was used to study the phase transitions of LiK0.80(NH4)0.20SO4 mixed crystals in the temperature range 10–300K. The relevant elastic stiffness coefficients were evaluated at room temperature. The quasi-longitudinal γ16 and the quasi-transverse γ17 mode frequencies were measured in the above temperature range. From their frequency vs. temperature curve, three different phase...
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