Poisson Ratio and Biaxial Relaxation Coefficient in In_{x}Ga_{1-x}N and In_{x}Al_{1-x}N Alloys

• Authors: S. Łepkowski , I. Gorczyca
• Languages of publication: EN

Abstracts

EN

We present theoretical results showing dependence of Poisson ratio and biaxial relaxation coefficient on composition and atomic arrangement in wurtzite In_{x}Ga_{1-x}N and In_{x}Al_{1-x}N alloys. Our calculations reveal that the Poisson ratio determined for In_{x}Ga_{1-x}N and In_{x}Al_{1-x}N 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 In_{x}Ga_{1-x}N and In_{x}Al_{1-x}N 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 In_{x}Ga_{1-x}N and In_{x}Al_{1-x}N, respectively. The effect of In atom clustering results in sublinear dependence of the biaxial relaxation coefficient in both In_{x}Ga_{1-x}N and In_{x}Al_{1-x}N alloys.

Keywords

EN

62.20.de; 61.43.Dq; 81.40.Jj

Discipline

• 62.20.de: Elastic moduli
• 81.40.Jj: Elasticity and anelasticity, stress-strain relations
• 61.43.Dq: Amorphous semiconductors, metals, and alloys

• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 120
• Issue: 5
• Pages: 902-904

Dates

published

2011-11

Contributors

author

S. Łepkowski

• Institute of High Pressure Physics - Unipress, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warszawa, Poland

author

I. Gorczyca

• Institute of High Pressure Physics - Unipress, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warszawa, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.120.902