Poisson Ratio and Biaxial Relaxation Coefficient in InxGa1-xN and InxAl1-xN Alloys |
| S.P. Łepkowski and I. Gorczyca
Institute of High Pressure Physics - Unipress, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warszawa, Poland |
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| We present theoretical results showing dependence of Poisson ratio and biaxial relaxation coefficient on composition and atomic arrangement in wurtzite InxGa1-xN and InxAl1-xN alloys. Our calculations reveal that the Poisson ratio determined for InxGa1-xN and InxAl1-xN alloys subjected to a uniaxial stress parallel to the c axis of the wurtzite structure shows significant superlinear dependence on composition. The superlinear bowing in Poisson ratio is enlarged by the effect of In clustering. The biaxial relaxation coefficient determined for InxGa1-xN and InxAl1-xN alloys subjected to a biaxial stress in the plane perpendicular to the c axis of the wurtzite structure changes superlinearly and linearly with x in InxGa1-xN and InxAl1-xN, respectively. The effect of In atom clustering results in sublinear dependence of the biaxial relaxation coefficient in both InxGa1-xN and InxAl1-xN alloys. |
| DOI: 10.12693/APhysPolA.120.902 PACS numbers: 62.20.de, 61.43.Dq, 81.40.Jj |