Low-temperature elastic and dielectric properties of K3Na(SO4)2 crystals

✍ Scribed by M. Wiesner; M. Kaczmarski; A. Eichner; S. Mielcarek; B. Mróz

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 118 KB
• Volume: 41
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200510624

✦ Synopsis

Elastic and dielectric properties of glaserite K 3 Na(SO 4 ) 2 single crystal were examined using the method of composite oscillators, Brillouin light scattering methods and dielectric spectroscopy. Measurements were performed in the temperature range from 18 K to 300 K. Anomalies in the temperature dependencies of Brillouin shift and dielectric permittivity at about 70 K confirmed the earlier predicted phase transition at 75 ± 25 K. Temperature dependences of the resonance frequency of the vibrating composite oscillator, Brillouin shift measured in the [110] direction, components of dielectric permittivity tensor reveal an anomaly at about 50 K. Moreover, thermal hysteresis of the dielectric permittivity suggested the presence of an incommensurate state between T 1 = 50 K and T 2 = 70 K.