An Atom-Pair Bond Theory for the Alloying of Metals

Details An Atom-Pair Bond Theory for the Alloying of Metals An Atom-Pair Bond Theory for the Alloying of Metals

2009-04-04

arxiv.org/abs/0904.0697v1

Physics

Condensed Matter

Materials Science

8 pages, 5 figures, 4 more pages in Appendix

Scientific paper

We present an Atom-Pair Bond (APB) theory for the energy of a metallic bond based on the ideas of covalent bonding proposed by Pauling. An expression is derived which accurately predicts the signs of the heats of formation of binary alloys. It also explains the characteristics of the Rajasekharan-Girgis lines and their ability to predict accurately concomitant and mutually exclusive structure types in phase diagrams. Evidence is provided to show that the charge transfer on the atom-pair bond which is central to the present theory decides the experimentally observed volume changes on alloying.

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