Ultrasonic velocity and absorption in RbH3(SeO3)2 near the curie temperature

Abstract

Ultrasonic velocities (vi) and absorption coefficients (αii) of longitudinal waves propagating along the a, b, and c axes in RbH3(SeO3)2 near the Curie temperature (Tc) were measured by pulse echo superposition technique. The crystal shows anomalies both in vi and αii (i =1, 2, 3) at Ti =(2.2°C + Tc), the upper phase transition temperature reported by Gladkii et al., besides their anomalies at Tc. The anomalous parts of vi and αii all show a tendency to diverge at Ti. © 1980, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.