Abstract
The velocities and the attenuation of ultrasonic waves have been investigated as a function of temperature (255K≦T≦350K) for the cubic phase of K2SnCl6 which undergoes a structural transition atT c1≃263K. An anomalous decrease of the shear stiffness constantc′=1/2(c 11 −c 12) of about 30% between room temperature andT c1 is found in this cubic high temperature phase whenT c1 is approached from above. Whereas the softening ofc′ extends over a substantial temperature range (about 50 K), the other shear constantc 44 shows only a weak decrease, which is an order of magnitude smaller and restricted toT−T c1≦10 K. NearT c1, a strong increase occurs in the attenuation of the shear acoustic wave propagated along the [111] direction, while such an anomalous attenuation is not observed for the transverse acoustic wave propagated along [100]. Furthermore, atT c1 a hysteresis is detected for the longitudinal sound wave velocityv L[100], which is restricted to the temperature region 262K≦T≦263.5 K. In addition, the room-temperature elastic constants of (NH4)2SiF6 and the hydrostatic pressure derivatives of the elastic constants of K2SnCl6 and (NH4)2SiF6 at room-temperature are presented and discussed in terms of mode softening behaviour.
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Pelzl, J., Höck, K.H., Miller, A.J. et al. Ultrasonic investigation of phase transitions in K2SnCl6 . Z. Physik B - Condensed Matter 40, 321–329 (1981). https://doi.org/10.1007/BF01292849
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DOI: https://doi.org/10.1007/BF01292849