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Wide-angle X-ray scattering studies were performed on In-Se amorphous films, obtained by thermal evaporation, with selenium content of 60 and 66 at.%. The intensities were recorded in the scattering vector range between 3 and 160 nm−1. Structural information about the local structure of the amorphous In-Se films has been derived from the radial distribution function using the curve-fitting method. The experimental results have been compared with model based simulations. The obtained structural parameters indicate that for In40Se60 In-In, In-Se and Se-Se contributions are involved in the near-neighbour coordination sphere. As the Se content is increased, the number of In-In bonds is reduced to zero, within the precision of the method. For both amorphous films In is tetrahedrally coordinated while Se has three near neighbours on the average. [ABSTRACT FROM AUTHOR]

Abstract: The atomic structure of chalcogenide glasses As3Se7−x Te x (0≤ x ≤3) and As2Se3−x Te x (0≤ x ≤2.5) has been investigated by different methods. Short-range order has been studied by Wide-Angle X-ray Scattering (WAXS). 77Se NMR as well as Raman and infrared measurements were also performed on the different compositions. We show that the progressive introduction of tellurium in As3Se7−x Te x or As2Se3−x Te x induces breaking of Se–Se bonds and the formation of AsSe3−x Te x pyramidal units. Experimental data also reveal the absence of Te–Te bonds even in the tellurium richest composition which let suppose a homogeneous repartition of tellurium atoms in the glassy network. [ABSTRACT FROM AUTHOR]

A new family of nickel ethylenetetrathiolate polymers with metallocenium cations has been prepared. Structural informations about these amorphous polymers have been determined by wide angle X-ray scattering. The magnetic properties of these polymer salts has been studied by SQUID measurements. [Copyright &y& Elsevier]