The Contribution of Zero-Point Vibration toward the Static and Thermodynamical Properties of Potassium Halides

作者: R. P. Singh , J. P. S. Rana , G. B. Varshney

DOI: 10.1002/PSSB.2221210207

关键词:

摘要: The cohesive energy, molecular force constant, reststrahlen frequency, third-order elastic (TOE) constants, van der Waal's coefficients, bulk modulus, and its pressure dependence are evaluated for potassium halides using a generalised-shell model (GSM) in which the zero-point energy is estimated from relation used by Narayan Ramaseshan, (vdW) coefficients Slater-Kirkwood-variational (SKV) method. Hafemeister-Flygare (HF) type short-range overlap repulsive potential, effective up to second neighbours, used. results obtained excellent agreement with experimental data. Mit dem verallgemeinerten Schalenmodell (GSM), die Nullpunktsenergie aus von und Ramaseshan benutzten Beziehung bestimmt wird, werden Kohasionsenergie, molekulare Kraftkonstante, Reststrahlenfrequenz, elastischen Konstanten dritter Ordnung, Waals-Koeffizienten, Elastizitatsmodul seine Druckableitung fur Kaliumhalogenide berechnet, Waals (vdW)-Koeffizienten mit Variationsmethode nach Slater-Kirkwood (SKV-Methode) berechnet. Dabei wird das kurzreichweitige, abstosende Uberlappungspotential (HF), bis zu zweiten Nachbarn wirkt, benutzt. Die erzielten Ergebnisse befinden sich ausgezeichneter Ubereinstimmung den experimentellen Werten.

参考文章(31)
J. T. Lewis, A. Lehoczky, C. V. Briscoe, Elastic Constants of the Alkali Halides at 4.2°K Physical Review. ,vol. 161, pp. 877- 887 ,(1967) , 10.1103/PHYSREV.161.877
R. K. Singh, Shailendra Tiwary, An Interionic Potential Model for Crystal Properties of Alkali Hydrides Journal of the Physical Society of Japan. ,vol. 49, pp. 1046- 1050 ,(1980) , 10.1143/JPSJ.49.1046
M J Sangster, R M Atwood, U Schroder, Interionic potentials for alkali halides. I. Crystal independent shell parameters and fitted Born-Mayer potentials Journal of Physics C: Solid State Physics. ,vol. 11, pp. 1523- 1540 ,(1978) , 10.1088/0022-3719/11/8/014
R. P. Singh, A lattice dynamical study of potassium halide solids Physica Status Solidi (b). ,vol. 92, pp. 557- 563 ,(1979) , 10.1002/PSSB.2220920227
W. Cochran, Lattice dynamics of ionic and covalent crystals Critical Reviews in Solid State and Materials Sciences. ,vol. 2, pp. 1- 44 ,(1971) , 10.1080/10408437108243425
M. H. Norwood, C. V. Briscoe, Elastic Constants of Potassium Iodide and Potassium Chloride Physical Review. ,vol. 112, pp. 45- 48 ,(1958) , 10.1103/PHYSREV.112.45
Dielectric Dispersion and the Structures of Ionic Lattices Proceedings of The Royal Society A: Mathematical, Physical and Engineering Sciences. ,vol. 308, pp. 473- 496 ,(1969) , 10.1098/RSPA.1969.0021
S. P. Sanyal, R. K. Singh, Study of Anharmonic Properties of Alkaline Earth Oxides physica status solidi (b). ,vol. 105, pp. 193- 199 ,(1981) , 10.1002/PSSB.2221050121
Arnold M. Karo, John R. Hardy, Lattice Dynamics and Specific-Heat Data for Rocksalt-Structure Alkali Halides Physical Review. ,vol. 129, pp. 2024- 2036 ,(1963) , 10.1103/PHYSREV.129.2024