Germanium selenide glass structures studied by 77Se solid state NMR and mass spectroscopy

Some resolved solid state 77Se NMR spectra are presented in the GexSe1−x glass family at ambient temperature. Two types of line positions are exhibited related to the presence or absence of Ge atoms as first neighbours around one Se atom. The relative intensity measurements of both lines are carried out via deconvolution of the spectra. It appears that a scenario involving a selenium clustering process has to be considered rather than a structural model based on GeSe4 tetrahedra homogeneously distributed among the network. This result is supported by mass spectroscopy experiments that demonstrate the presence of Se6 rings in the glass.