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Bandfilling and structural stability of trialuminides: YAl3, ZrAl3, and NbAl3

Published online by Cambridge University Press:  31 January 2011

Jian-hua Xu  and
A.J. Freeman
Jian-hua Xu
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208–3112, and Shanghai Institute of Metallurgy, Academy of Sciences of China, Shanghai 200050, China
A.J. Freeman
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208–3112, and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

The cohesive properties and electronic structures versus the structural stability of transition-metal trialuminides YAl3, ZrAl3, and NbAl3 in their cubic L12, tetragonal DO22, and naturally stable forms (i.e., the DO19 structure for YAl3 and the DO23 structure for ZrAl3) have been investigated using a total energy local-density approach. The variation of structural stability with transition-metal constituent can be simply understood in terms of the bandfilling of the bonding states in the rigid band sense, with the valence electrons gradually filling the bonding states on going from YAl3, ZrAl3 to NbAl3. This leads to a phase transition from the cubic L12 structure (for YAl3) to the tetragonal DO22 structure (for NbAl3). It is argued that this criterion may also apply to explain the variation of the structural stability of other transition-metal compounds (such as transition-metal carbides, nitrides, silicides, etc.) that are dominated by covalent interactions between the transition-metal d and the metalloid p states.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 6 , June 1991 , pp. 1188 - 1199
Copyright
Copyright © Materials Research Society 1991

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