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Journal: Review of Advances in Physics Theories and Applications

Abstract: The surface energies of the low index 100, 110 and 111 planes of some bcc alkali metals Li,Na,K,Rb,Cs and for the bcc transition metals Fe,W,Mo,Cr,Ta,Nb and V have been calculated using the Modified Analytical Embedded Atom Method MAEAM.The surface energy of each hkl plane in alkali metals was found to be much more lower than those of the transition metals. The experimental values of surface energies are not tied to specific surfaces and are obtained for polycrystalline materials. They do not correlate with computed values published for any of these surfaces. This is expected since experiments give direct results. For all bcc metals the order of the surface energy is such that Es110 < Es100 < Es111 which is in agreement with the results obtained except for 111 surface. Our calculated result shows that Es111 < Es110 < Es100. This is not in agreement with the result of MAEAM.1 The paper contributes the first logical analysis of the surface energy of transition metals and alkali metals at low index level.

Engineering

Review of Advances in Physics Theories and Applications

Month: 06-2014 Issue: 1







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