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Low‐temperature elastic and dielectric properties of K 3 Na(SO 4 ) 2 crystals
Author(s) -
Wiesner M.,
Kaczmarski M.,
Eichner A.,
Mielcarek S.,
Mróz B.
Publication year - 2006
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200510624
Subject(s) - dielectric , brillouin zone , permittivity , brillouin scattering , condensed matter physics , brillouin spectroscopy , atmospheric temperature range , materials science , dielectric permittivity , phase transition , dielectric spectroscopy , crystal (programming language) , relative permittivity , hysteresis , vacuum permittivity , resonance (particle physics) , optics , chemistry , thermodynamics , physics , optoelectronics , atomic physics , optical fiber , electrode , electrochemistry , computer science , programming language
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. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)