High-Pressure High-Temperature Studies of Structural Ordering in GaSb
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Abstract:
Both angle-dispersive and EXAFS experiments have been carried out to investigate the structural ordering of the high-pressure (hp) and high-pressure high-temperature (hp/ht) phases of GaSb. The diffraction patterns of all the different phases of GaSb have shown an absence of long-range order, while the EXAFS studies have demonstrated the lack of complete short-range order. GaSb is the only semiconductor compound among the III–V and II–VI systems to present such behaviour in all of its different hp and hp/ht phases.Keywords:
Atmospheric temperature range
Short range order
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Short range order
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Short range order
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Extended x-ray absorption fine structure (EXAFS) spectroscopy is an established technique for determining the nature of the coordination sphere about a given atom in relatively pure materials. Hence, EXAFS shows great potential for providing chemical speciation of environmental samples. However, it is not clear whether EXAFS can be used to quantify more than one species of the same analyte atom in a sample. The authors have characterized the silicon EXAFS data for various mixtures of Ca-Mg and Li-Al pyroxenes (two very similar silicate structures) as well as the Cr EXAFS of various mixtures of oxides and nitrates. This investigation has revealed some of the limitations and potential applications of quantitative EXAFS.
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Characterization
Coordination sphere
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X-ray absorption spectroscopy
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CuBr2 solutions at different concentrations were studied by extended X-ray absorption fine structure (EXAFS) at the Cu K edge. In the saturated solution Cu2+ ions have chemical bonds with 3.0 oxygen atoms and 0.9 Br ion at about 1.96 Å and 2.42 Å, respectively. It indicates that the CuBr4-2 configuration exists with a ratio of 25% under this condition. In the dilute solutions no evidence of Br ions contributions in the first shell around Cu2+ ions occurs. The almost identical X-ray absorption near edge structure (XANES) and EXAFS characters address similar local environments around Cu2+ in agreement with results of the EXAFS fit taking into account only the contributions of Cu-O bonds.
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K-edge
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X-ray absorption spectroscopy
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