Related Experiment Video
Updated: May 15, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Observation of a continuous random network structure in Ge(x)Se(100-x) glasses: results from high-resolution 77Se
Derrick C Kaseman1, Ivan Hung, Zhehong Gan
1Division of Materials Science, University of California, Davis, California 95616, USA.
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.
Related Concept Videos
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
2D NMR: Homonuclear Correlation Spectroscopy (COSY)
UV–Vis Spectroscopy of Conjugated Systems
One of the factors influencing λmax is the extent of conjugation in the...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

