title: Observation of a continuous random network structure in Ge(x)Se(100-x) glasses: results from high-resolution 77Se MATPASS/CPMG NMR spectroscopy.
abstract: The coordination environments of Se atoms in binary Ge(x)Se(100-x) glasses with 5 ≤ x ≤ 30 are investigated using a novel, two-dimensional (77)Se nuclear magnetic resonance (NMR) spectroscopic technique. The high-resolution isotropic (77)Se NMR spectra allow for the identification of up to four distinct Se sites in these glasses. The chemical shift tensor parameters for these sites offer unique insights into their local site symmetries and nearest- and next-nearest-neighbor coordination environments. The structural results, when taken together, provide direct evidence in favor of the existence of a randomly connected network of GeSe(4) tetrahedra and Se-Se chain fragments in these glasses.
authors.affiliation: Division of Materials Science, University of California, Davis, California 95616, USA.
authors.forename: Derrick C
authors.initials: DC
authors.lastname: Kaseman
authors.forename: Ivan
authors.initials: I
authors.lastname: Hung
authors.forename: Zhehong
authors.initials: Z
authors.lastname: Gan
authors.forename: Sabyasachi
authors.initials: S
authors.lastname: Sen