Lattice parameters, deviations from Vegard’s rule, and E2 phonons in InAlN

Darakchieva, V.; Xie, M.-Y.; Tasnádi, F.; Abrikosov, I. A.; Hultman, L.; Monemar, B.; Kamimura, J.; Kishino, K.
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p261908
Academic Journal
The lattice parameters of InxAl1-xN in the whole compositional range are studied using first-principle calculations. Deviations from Vegard’s rule are obtained via the bowing parameters, δa=0.0412±0.0039 Å and δc=-0.060±0.010 Å, which largely differ from previously reported values. Implications of the observed deviations from Vegard’s rule on the In content extracted from x-ray diffraction are discussed. We also combine these results with x-ray diffraction and Raman scattering studies on InxAl1-xN nanocolumns with 0.627<=x<=1 and determine the E2 phonon frequencies versus In composition in the scarcely studied In-rich compositional range.


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