The attenuation coefficient α of longitudinal ultrasonic waves propagating along the [100] direction in single-crystal ammonium chloride has been measured as a function of frequency from 5 to 55 Mc/sec and as a function of temperature from 200° to 270°K. A sharp maximum is observed in α at the order—disorder critical temperature. The results are analyzed in terms of a relaxation model with a highly temperature-dependent relaxation time.
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Garland et al. (1965) studied this question.
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