Аннотация
Brillouin spectroscopy was used to study the phase transitions of
LiK0.80(NH4)(0.20)SO4 mixed crystals in the temperature range 10-300 K.
The relevant elastic stiffness coefficients were evaluated at room
temperature. The quasi-longitudinal gamma(16) and the quasi-transverse
gamma(17) mode frequencies were measured in the above temperature range.
From their frequency vs. temperature curve, three different phase
transitions were determined. Two of the four phases presented by the
crystal were found to be ferroelastic. The observed phases are
tentatively assigned through a comparison with the phase transitions
undergone by LiKSO4 and LiK0.96(NH4)(0.04)SO4 crystals. An anomalous
behavior of the Brillouin linewidth near the 260 K phase transition was
observed. (C) 2002 Elsevier Science Ltd. All rights reserved.
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