A review of the application of 2D isotropic-anisotropic correlation NMR spectroscopy in structural studies of chalcogenide glasses

摘要: Abstract The application of solid-state high-resolution NMR spectroscopy in the structural investigation chalcogenide glasses Ge/As/P/Si-X (X = S, Se,Te) systems has remained challenging even for spin-1/2 nuclides (29Si, 31P, 77Se, 125Te), owing to their low natural abundance (except 31P), slow spin-lattice relaxation rate and large CSA chemical shift distribution induced line broadening effects. However, most these deleterious effects can be successfully overcome two-dimensional (2D) isotropic-anisotropic correlation experiments, especially when performed at high magnetic field conjunction with Car-Purcell-Meiboom-Gill (CPMG) echo train acquisition. In this contribution we present a short introduction basic principles such experiments review applications over last decade deciphering various short- intermediate- range characteristics S-Se, Se-Te, Ge-Se, As-Se Si-Se as well investigating molecular dynamics P-Se supercooled liquid. We anticipate possible future 2D particularly density functional theory-based calculations tensor parameters additional signal enhancement schemes, addressing complex correlations distributions glasses.