Structural and mechanical stability of rare-earth diborides

doi:10.1088/1674-1056/22/4/046202

Abstract Structural and mechanical properties of several rare-earth diborides were systematically investigated by first principles calculations. Specifically, we studied XB₂, where X=Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Lu in the hexagonal AlB₂, ReB₂, and orthorhombic OsB₂-type structures. The lattice parameters, bulk modulus, bond distances, second order elastic constants, and related polycrystalline elastic moduli (e.g. shear modulus, Young's modulus, Poisson's ratio, Debye temperature, sound velocities) were calculated. Our results indicate that these compounds are mechanically stable in the considered structures, and according to the "Chen's method," the predicted Vickers hardness shows that they are hard materials in AlB₂- and OsB₂-type structures.

Keywords: ab initio calculations elastic properties hardness rare-earth diborides

Received: 11 August 2012
Revised: 13 September 2012
Accepted manuscript online:

PACS:	62.20.de	(Elastic moduli)
	71.15.Nc	(Total energy and cohesive energy calculations)

Corresponding Authors: Engin Deligoz
E-mail: edeligoz@yahoo.com

Cite this article:

Haci Ozisik, Engin Deligoz, Kemal Colakoglu, Gokhan Surucu Structural and mechanical stability of rare-earth diborides 2013 Chin. Phys. B 22 046202

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