Selenium−Tellurium Sequences in Binary Glasses as Depicted by <sup>77</sup>Se and <sup>125</sup>Te NMR
作者:Bruno Bureau、Catherine Boussard-Plédel、Marie LeFloch、Johann Troles、Frédéric Smektala、Jacques Lucas
DOI:10.1021/jp044398n
日期:2005.4.1
Some resolved solid state Se-77 NMR spectra are presented in the TexSe1-x vitreous system at ambient temperature. They exhibit three different kinds of Se lines assigned to the following Se atom neighborhoods: Se-Se-Se, Se-Se-Te, and Te-Se-Te. Different models were considered to describe the way the Se and Te atoms are linked into the chains: clustering process, homogeneous distribution, random distribution. Finally, thanks to the measurements of the relative intensities of the lines, it appears that Se and Te atoms are mainly randomly distributed with a small preference for heteropolar bonds. The Te-125 spectra are also shown but their resolution is too weak to be informative concerning the vitreous network.