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Acoustic studies of the ferroelastic phase transition in the K3Na(CrO4)2 crystal

Ultrasonic studies of the K3Na(CrO4)2 crystal were carried out within a temperature range of 185 to 295 K. Temperature dependences of the velocity and attenuation coefficient for the xx and zz longitudinal acoustic waves and the yx and zx transverse waves were measured. Noticeable anomalies in velocity and attenuation for transverse as well as for longitudinal waves were found near the ferroelastic phase transition which temperature was 235.5 K. The anomalies in the c44 and c66 elastic moduli were treated on the base of the Landau theory assuming the component ε4 as the primary order parameter and (ε2–ε1)/2 as the secondary one. Six elastic moduli, c11, c33, c44, c66, c12, and c14 were evaluated at room temperature.