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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27765


    Title: X-ray absorption fine structure studies of Hg1-xCdxTe and Hg1-xMnxTe bond lengths : Bond relaxation and structural stability of ternary alloys
    Authors: Mayanovic, R. A.;Pong, Way-faung;Bunker, B. A.
    Contributors: 淡江大學物理學系
    Date: 1990-12
    Issue Date: 2013-07-09 15:05:52 (UTC+8)
    Publisher: College Park: American Physical Society
    Abstract: Bond lengths in the narrow-band-gap semiconductor alloys Hg1-xCdxTe and Hg1-xMnxTe have been deduced using x-ray-absorption fine-structure techniques. The nearest-neighbor bond lengths, for both alloy systems, are found to be constant as a function of alloy composition within the experimental uncertainties of 0.01 Å. These results contradict the predictions of some recent theories for Hg1-xCdxTe alloys, finding the Hg-Te and Cd-Te bond lengths to be decreasing in spite of the lattice constant increasing with x. The bond relaxation in several III-V, II-VI, and II-VI-based diluted magnetic semiconductor (DMS) ternary alloys is found to be quantitatively proportional to the ratio of bond bending to bond-stretching force constants. Hg1-xCdxTe and DMS alloys, including Hg1-xMnxTe, are found to have the largest amount of bond relaxation. For DMS's, this is attributed to tetrahedral bond weakening resulting from hybridization of anion p and Mn 3d orbitals thereby decreasing the amount of charge available for the making of sp3 bonds.
    Relation: Physical Review B (Condensed Matter) 42(17), pp.11174-11182
    DOI: 10.1103/PhysRevB.42.11174
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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