Anomalous behavior of lattice parameters and elastic constants in hcp Ag-Zn alloys
Physical Review B - Condensed Matter and Materials Physics, ISSN: 0163-1829, Vol: 70, Issue: 5
2004
- 41Citations
- 16Captures
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Article Description
The observed c/a lattice parameter of hcp solid solution Ag Zn shows anomalous behavior in both ε (0.680.95) phases. We investigate the nature of these anomalies by performing ab initia exact muffin-tin orbitals total energy calculations for hcp AgZn random alloys. The peculiar features in crystal structure and elastic constants are mapped out in detail, and where experimental data are available they excellently agree with the theoretical results. The sharp variation in c/a obtained for x=0.87 is explained by an almost zero resistance to c/a variations at constant volume, giving a deformation path with a very low energy barrier connecting the ε and η phases. The rapid decrease of c/a in Zn-rich alloys, on the other hand, is found to have a band energy origin.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=42749100552&origin=inward; http://dx.doi.org/10.1103/physrevb.70.052102; https://link.aps.org/doi/10.1103/PhysRevB.70.052102; http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.70.052102/fulltext; http://link.aps.org/article/10.1103/PhysRevB.70.052102
American Physical Society (APS)
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