Selenium-tellurium sequences in binary glasses as depicted by 77Se and 125Te NMR.
Some resolved solid state (77)Se NMR spectra are presented in the Te(x)Se(1-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 (125)Te spectra are also shown but their resolution is too weak to be informative concerning the vitreous network.
Bureau
Bruno
B
Laboratoire des Verres et Céramiques, UMR-CNRS 6512, université de Rennes 1, campus de Beaulieu, 35042 Rennes Cedex, France. bruno.bureau@univ-rennes1.fr
Boussard-Plédel
Catherine
C
LeFloch
Marie
M
Troles
Johann
J
Smektala
Frédéric
F
Lucas
Jacques
J