Abstract
Starting with second-nearest-neighbour distance and hardness parameter of the substance and Coulomb and Born-Mayer potentials, thermal-relaxation time, average Gruneisen numbers, nonlinearity constants and attenuation are evaluated from 50 to 500 K along two principal directions of propagation for both longitudinal and transverse waves in NaF, NaCl and NaBr. The variation of thermal-relaxation time follows theT−n law (1<n<3). The attenuation also varies according toTn law (0.2<n<1.3 below 200 K and 1<−n<2 above 200 K). The results are compared with experimental and theoretical values available in the literature. It is also concluded that ultrasonic attenuation is a very important property of the substances.
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