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- W2060025318 abstract "To study the structure and symmetry of intrinsic point defects in GaAs, internal-friction measurements on n-type single crystals of different doping levels were performed in the range 80--440 K for a frequency of about 105 kHz. Actually, we detected damping peaks due to relaxation of point defects which are shown to be of 〈110〉 orthorhombic symmetry. The present analysis of the peak spectra supports an explanation in terms of midgap defect reorientations where charge-state effects seem to play a central role. The determination of the kinetic parameters of the relaxations yields activation energies of 0.6--0.8 eV for the ${ensuremath{nu}}_{13}$ and 0.85--1 eV for the ${ensuremath{nu}}_{12}$ reorientation. Remarkably large ${mathrm{ensuremath{tau}}}_{0}^{mathrm{ensuremath{-}}1}$ values of ${10}^{18}$ ${mathrm{sec}}^{mathrm{ensuremath{-}}1}$ are found for the latter. They are attributed to activation entropies of the order 10k." @default.
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- W2060025318 date "1991-08-15" @default.
- W2060025318 modified "2023-09-25" @default.
- W2060025318 title "Internal friction and symmetry of intrinsic point defects in GaAs" @default.
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- W2060025318 doi "https://doi.org/10.1103/physrevb.44.3695" @default.
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