Search results for "structural disorder."

showing 2 items of 2 documents

Absorption edge in silica glass

2005

Measurements of optical absorption in the v-UV range in a variety of silica glass are used to determine the width of the absorption edge (Urbach energy). Measured values range from 60 meV up to 180 meV. So high a variability over silica types is tentatively ascribed to the different disorder degree, which characterizes different materials.

Range (particle radiation)Materials scienceOptical glassSilica glassbusiness.industryCrystalline materialsSettore FIS/01 - Fisica SperimentaleAnalytical chemistryPhysics::OpticsCondensed Matter::Disordered Systems and Neural NetworksAmorphous solidOpticsAbsorption edgeOptical materialsUrbach energySilica glastructural disorder.Absorption (electromagnetic radiation)business
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Modeling bismuth insertion in 1D hybrid lead halide TMSO(Pb x Bi y )I3 pseudo-perovskites

2022

Abstract The structures of the disordered 1D (pseudo-)perovskites of general TMSO(Pb x Bi y )I3 formulation [TMSO = (CH3)3SO+], obtained by doping the TMSOPbI3 species with Bi3+ ions, are investigated through the formulation of a statistical model of correlated disorder, which addresses the sequences of differently occupied BI6 face-sharing octahedra (B = Pb, Bi or vacant site) within ideally infinite [(BI3)−] n chains. The x-ray diffraction patterns simulated on the basis of the model are matched to the experimental traces, which show many broad peaks with awkward (nearly trapezoidal) shapes, under the assumption that the charge balance is fully accomplished within each chain. The analysis…

lead halideMechanical EngineeringBioengineeringGeneral Chemistryaliovalent dopingface-sharing octahedraXRD whole pattern simulation; aliovalent doping; face-sharing octahedra; hybrid perovskites; lead halide; structural disorderSettore CHIM/03 - Chimica Generale E Inorganicastructural disorderMechanics of MaterialsXRD whole pattern simulationGeneral Materials ScienceElectrical and Electronic Engineeringhybrid perovskitesNanotechnology
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