The temperature dependence of the phase velocity and absorption of ultrasound propagating along the [110] axis in a ZnSe crystal doped with ions is investigated in the frequency interval . It is found that the absorption peak and anomalies of the phase velocity observed in the temperature interval are of a relaxation nature. The temperature dependence of the relaxation time and the relaxed (isothermal) and unrelaxed (adiabatic) elastic moduli are recovered from the data. Oscillations of the amplitude and phase of the signal are observed at . An interpretation of this phenomenon is proposed.
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.© 2007 American Institute of Physics.
2007
American Institute of Physics
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