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- W2038543669 abstract "Abstract A new procedure for the determination of the Poisson ratio, the elastic stiffness constant ratios and the lattice parameter of epitaxial films is presented which is based on the strain tensor determination by high-resolution X-ray diffraction by using epitaxial layers simultaneously grown on three different substrate orientations and different alloy compositions. Our method allows us to verify the validity of the Vegard's rule and/or to evidence a difference in the incorporation of group- III -elements in ternary III – V semiconductor films. We discuss the results obtained from Al x Ga 1− x As epilayers coherently grown simultaneously on (1 0 0)-, (2 1 0)- and (3 1 1)-GaAs substrate crystals. Assuming a GaAs lattice parameter d GaAs =0.565325±0.000002 nm our experiment yields the AlAs lattice parameter d AlAs =0.566139±0.000005 nm. The stiffness elastic lattice constant ratios for AlAs is c 12 / c 11 =0.475±0.003, which leads to a Poisson ratio ν =0.322±0.001 and c 44 / c 11 =0.517±0.003. An analogous analysis for the ternary Al x Ga 1− x As compound with x =0.5 yields a lattice parameter value and elastic constant ratios which are in agreement with the Vegard's rule. Within the accuracy of our method no deviation for the Al incorporation in the differently oriented samples has been observed." @default.
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- W2038543669 date "1998-10-01" @default.
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- W2038543669 title "Validity of vegard's rule for the lattice parameter and the stiffness elastic constant ratios of the AlGaAs ternary compound" @default.
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- W2038543669 doi "https://doi.org/10.1016/s0038-1098(98)00374-3" @default.
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