Portal de Periódicos da CAPES

Phase Transition in Ferroelectric RbH 3 (SeO 3 ) 2

1980; Physical Society of Japan; Volume: 49; Issue: 6 Linguagem: Inglês

10.1143/jpsj.49.2255

1347-4073

Yoshihiro Gotō, E. Sawaguchi,

Optical and Acousto-Optic Technologies

Dielectric and elastic properties of RbH 3 (SeO 3 ) 2 and the ferroelectric domain structure have been investigated around the transition point of T c =-117°C. In contrast to the previous results, no evidence of occurrence of an intermediate phase around T c has been found; and only one sharp ferroelectric transition occurs at T c . The contrasting result seems to be due to mainly a difference of origins of sample crystals: occasionally as-grown RbH 3 (SeO 3 ) 2 crystals are not of homogeneous quality and contain such portions that neither reveal a clear domain structure nor exhibit a well defined ferroelectric D - E hysteresis loop. Such specimens usually show several anomalies in the dielectric and elastic constants around -117^° C . Thus the anomalies are apt to be misinterpreted as representing successive phase transitions. A need of special care in selecting a homogeneous specimen is disclosed.