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- W2061313423 abstract "We show that the static atomic displacements (SDs) from the average crystal sites, which exist in all III–V and II–VI semiconductor alloys where atoms having different covalent radii share a mixed sublattice, have a large effect on the structure factors (SFs) of the weak reflections (h + k + l = 4n + 2) of the cubic crystals of such alloys. Using atomistic simulations, this effect is studied quantitatively for 25 ternary alloys. Parameters describing the variations in the SFs with alloy composition for both electrons and X-rays are given. The sign of the difference between SFs calculated with and without SDs is the same for most alloys with a type-III or type-II mixed sublattice and reverses for a type-V mixed sublattice. Non-zero imaginary parts appear for reflections with all indices non-zero. We use a simple approximation to explain these results, to provide general rules for the effect of the SDs and to estimate its magnitude. We also study quantitatively the large effect of the SDs in quaternary Ga1− x In x As1− y N y alloys with y ≪ 1. Our calculations explain part of the difference between the experiments and the standardly calculated SFs of Ga 1−x In x As alloys. They show that the SDs must be taken into account, particularly when such ‘quasiforbidden’ reflections are used to measure alloy composition by electron microscopy." @default.
- W2061313423 created "2016-06-24" @default.
- W2061313423 creator A5082131591 @default.
- W2061313423 date "2004-07-11" @default.
- W2061313423 modified "2023-09-27" @default.
- W2061313423 title "The effect of the static atomic displacements on the structure factors of weak reflections in cubic semiconductor alloys" @default.
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- W2061313423 doi "https://doi.org/10.1080/14786430410001678244" @default.
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