Ferroelastic phase transition in (NH₄)LiH₃(SO₄)₄: Brillouin scattering studies and Landau theory modeling

B. Mroz Institute of Fhysics, A. Mickiewicz University, Grunwaldzka 6, 60–780 Poznan, Poland

H. Kiefte Department of Physics, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3×7, Canada

M. J. Clouter Department of Physics, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3×7, Canada

J. A. Tuszynski Department of physics, University of Alberta, Edmonton, Alberta, T6G 2J1, canada

Abstract

High-resolution Brillouin spectroscopy was used to study the elastic properties of (NH₄)₄LiH(SO₄)₄. The temperature dependence of eleven Brillouin modes from acowtic phonons, propagating in the [100], [001], [110] and [101] directions were measured in the temperature range from 140 to 300 K. The greatest elastic anomaly was observed in the plane perperdicular to the [001] crystallographical direction. The soft elastic constant c_2S was found to vanish at T_C ≃ 232 K. In order to explain the observed elastic anomalies a Landau-type free energy expansion is postulated and discussed.

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Ferroelastic phase transition in (NH₄)LiH₃(SO₄)₄: Brillouin scattering studies and Landau theory modeling

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Ferroelastic phase transition in (NH₄)LiH₃(SO₄)₄: Brillouin scattering studies and Landau theory modeling