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Kaczmarski, Marceli
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article
Low-temperature elastic and dielectric properties of K <inf>3</inf>Na(SO<inf>4</inf>)<inf>2</inf> crystals
Abstract
<p>Elastic and dielectric properties of glaserite K<sub>3</sub>Na(SO <sub>4</sub>)<sub>2</sub> 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<sup>1</sup> = 50 K and T<sub>2</sub> = 70 K. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.</p>