Abstract
75As NQR and high-field NMR experiments have been performed on Ge x As y Se 1− x− y glasses. Evolution of As bonding structure from arsenic sites with axially symmetric distribution of the electric field gradient (EFG) to highly asymmetric As surroundings has been revealed. Arsenic atoms form pyramidal structural units in Ge 2As 2Se 7 with no evidence of significant concentration of homopolar bonds. In Ge 2As 2Se 5 most of arsenic atoms form structural units with two As–As bonds per atom and asymmetric EFG distribution. Arsenic bondings become more complicated in Ge 0.33As 0.12Se 0.55 where all arsenic sites are highly distorted. The combination of NQR and NMR data provide valuable information on arsenic bonding dynamics in these glasses.
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