Lattice instability and martensitic transformation in LaAg predicted from first-principles theory

Vaitheeswaran, G and V, Kanchana and Zhang, X and Ma, Y and Svane, A and Kaul, S N (2012) Lattice instability and martensitic transformation in LaAg predicted from first-principles theory. Journal of Physics Condensed Matter, 24 (7). ISSN 0953-8984

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The electronic structure, elastic constants and lattice dynamics of the B 2 type intermetallic compound LaAg are studied by means of density functional theory calculations with the generalized gradient approximation for exchange and correlation. The calculated equilibrium properties and elastic constants agree well with available experimental data. From the ratio between the bulk and shear moduli, LaAg is found to be ductile, which is unusual for B 2 type intermetallics. The computed band structure shows a dominant contribution from La 5d states near the Fermi level. The phonon dispersion relations, calculated using density functional perturbation theory, are in good agreement with available inelastic neutron scattering data. Under pressure, the phonon dispersions develop imaginary frequencies, starting at around 2.3GPa, in good accordance with the martensitic instability observed above 3.4GPa. By structural optimization the high pressure phase is identified as orthorhombic B 19

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Item Type: Article
Uncontrolled Keywords: Density functional perturbation theory; Density functional theory calculations; Dominant contributions; Equilibrium properties; Exchange and correlation; Experimental data; First-principles theory; Generalized gradient approximations; High-pressure phase; Imaginary frequency; Lattice instability; Phonon dispersions
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 15 Nov 2014 09:15
Last Modified: 14 Aug 2017 07:35
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