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Elastic Constants and Related Properties of the Group III-Nitrides

Published online by Cambridge University Press:  21 February 2011

Kwiseon Kim ,
Walter R. L. Lambrecht  and
B. Segall
Kwiseon Kim
Affiliation:
Department of Physics, Case Western Reserve University, Cleveland, OH 44106-7079
Walter R. L. Lambrecht
Affiliation:
Department of Physics, Case Western Reserve University, Cleveland, OH 44106-7079
B. Segall
Affiliation:
Department of Physics, Case Western Reserve University, Cleveland, OH 44106-7079
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Abstract

The elastic constants of the Group-III nitrides, c-BN, AlN and GaN were calculated from first-principles using the full-potential linear muffin-tin orbital method and local density approximation. The relation between the elatic constants in zincblende and wurtzite is studied by means of a tensor coordinate transformation approach. The latter combined with a correction for the internal displacement of the rotated tetrahedra is found to provide good results for the Ch11Ch12 and Ch44 but not for Ch13 and Ch33. These two require explicit calculations involving distortions along the c-axis. The calculations also provide information on the transverse optical phonons. By deriving Keating model parameters we show that BN is much stiffer against bond-angle distortions than the other nitrides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 395: Symposium AAA – Gallium Nitride and Related Materials: The First International Symp , 1995 , 399
Copyright
Copyright © Materials Research Society 1996

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References

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