Journal of Pure and Applied Ultrasonics

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Ultasonic Wave Velocities in Rocksalt Structure Solids


Affiliations
1 Department of Physics, Brahmanand Post-Graduate College, Rath, Hamirpur-210431, UP, India
2 Institute of Basic Sciences, Bundelkhand University, Jhansi-284128, UP, India
3 Department of Physics, Pt. J.N. P.G. College, Banda-210001, UP, India
 

An effort has been made for obtaining the second order elastic constants of rocksalt structure solids starting from primary physical parameters viz. nearest neighbour and hardness parameter assuming long- and short-range potentials at an elevated temperature. When the values of the second order elastic constants are known for a crystal, many of the anharmonic properties of the crystal can be treated within the limit of the continuum approximation in quantitative manner. The ultrasonic velocity any crystal is directly related to their second order elastic constants (v-longitudianal=(C11/d)1/2, v-shear=(C44/d)1/2;d is density). In this study, second order elastic constants are computed upto their melting temperature for rocksalt structure solids, which are alkali cyanides, sodium and potassium halides. The results thus obtained are compared with experimental data and found in well agreement with present values.
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  • Ultasonic Wave Velocities in Rocksalt Structure Solids

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Authors

Kailash
Department of Physics, Brahmanand Post-Graduate College, Rath, Hamirpur-210431, UP, India
K. M. Raju
Department of Physics, Brahmanand Post-Graduate College, Rath, Hamirpur-210431, UP, India
S. K. Shrivastava
Institute of Basic Sciences, Bundelkhand University, Jhansi-284128, UP, India
S. Kushwaha
Department of Physics, Pt. J.N. P.G. College, Banda-210001, UP, India

Abstract


An effort has been made for obtaining the second order elastic constants of rocksalt structure solids starting from primary physical parameters viz. nearest neighbour and hardness parameter assuming long- and short-range potentials at an elevated temperature. When the values of the second order elastic constants are known for a crystal, many of the anharmonic properties of the crystal can be treated within the limit of the continuum approximation in quantitative manner. The ultrasonic velocity any crystal is directly related to their second order elastic constants (v-longitudianal=(C11/d)1/2, v-shear=(C44/d)1/2;d is density). In this study, second order elastic constants are computed upto their melting temperature for rocksalt structure solids, which are alkali cyanides, sodium and potassium halides. The results thus obtained are compared with experimental data and found in well agreement with present values.