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ATOMIC ORDERING AND ALLOY CLUSTERING IN MBE-GROWN InAs ySbl-y EPITAXIAL LAYERS TAE-YEON SEONG* A.G. NORMAN*, G.R. BOOKER*, R. DROOPAD**, R.L. WILLIAMS**, S.D. PARKER**, P.D. WANG** AND R.A. STRADLING** * Dept. of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford OXI 3PH, U.K. ** Dept. of Physics, Imperial College, London SW17 2BZ, U.K. ABSTRACT MBE InAsnSb1 . layers were grown at 370°C across the full composition 'angle. TEM/TED examinations directly showed that separation into two phases had taken place for compositions 0.4

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