Elastic properties of zinc tris(thiourea) sulphate in a wide temperature range studied by Brillouin spectroscopy by S. Mielcarek, A. Trzaskowska, B. Mroz, and K. Komorowski

Crystal Research and Technology

Cryst. Res. Technol. 42, 1364 (2007) - Abstract -

Elastic properties of zinc tris(thiourea) sulphate in a wide temperature range studied by Brillouin spectroscopy

S. Mielcarek, A. Trzaskowska, B. Mroz, and K. Komorowski

Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland

Keywords	ferroelastic crystal, acoustic phonons, elastic constant, Brillouin spectroscopy
PACS	62.20.Dc, 63.20.-e, 68.35.Rh, 78.35.+c
DOI	10.1002/crat.200711033

The elastic properties of the zinc tris (thiourea) sulphate crystal were studied by Brillouin spectroscopy in the range 80 – 300 K. The measurements were made on single crystals obtained by the isothermal method. The temperature dependences of the Brillouin shift were determined for the crystal in the principal directions and in a few mixed directions on a tandem type spectrometer. The results revealed anomalies in the bulk wave propagation rate and in a few elastic constants at about 138 K.

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