| Vol. 53,
No. 4 October 1999 pp. 783-794 Pressure-volume calculation in bcc metals using Born stability criteria PIYUSH KUCHHAL and NARSINGH DASS Physics Department,
University of Roorkee, Roorkee 247 667, India Abstract. A simple analytical two-body potential f (r) = ¾ A r¾ n + B exp(¾ prm ) is considered for P-V calculations in bcc metals using Born stability criteria. It is shown that the stability of bcc metals can be expressed uniquely as a function of a parameter q (discussed in the text). The P-V calculations are done in ten bcc metals. The calculations are compared with the experimental data of shock-wave measurements and also with other potential available. It is found out that the present potential is better than the other two-body potentials in case of bcc metals. Further, the calculations done for TOEC and the first pressure derivative of SOEC are found in good agreement with the reported results. Keywords. Two-body pair potential; Born stability criteria; second and third order elastic constants; bcc metals. PACS Nos 64.30.+t; 62.20.Dc; 62.50.+p |