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Short- and Intermediate-Range Atomic Structure of Glassy and Liquid As2Se3 ? An Anomalous X-Ray Scattering Study
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1999
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X-ray CrystallographyCorrelation LengthCrystal StructureEngineeringPhysicsNatural SciencesLiquid As2se3Condensed Matter PhysicsApplied PhysicsX-ray DiffractionCorresponding CrystalChemistryIntermediate-range Atomic StructureCrystallographyCrystal Structure DesignSro Model
An anomalous X-ray scattering experiment has been performed for glassy (g-) and liquid (l-) As2Se3 in order to clarify the role of each constituent for the short- and intermediate-range order (SRO and IRO). The differential structure factors ΔiS(Q) close to the As and Se K edges have been obtained from a detailed analysis. The first nearest-neighbour distances around both As and Se are about 2.4 Å for both g- and l-As2Se3, which would support the SRO model that g- and l-As2Se3 have an SRO similar to the corresponding crystal. The pre-peak in S(Q) for g- and l-As2Se3, is dominated by a partial structure factor SAsAs(Q), which reveals the existence of the As–As IRO with a correlation length of about 5.2 Å.