Structural studies of covalent nonoxidic glasses: solid state cadmium-113 wide-line, magic angle-spinning, and spin-echo NMR spectroscopy of glasses in the system cadmium arsenide (CdAs2)-cadmium germanium arsenide (CdGeAs2)

Abstract

{sup 113}Cd wide-line, magic-angle-spinning, and dipolar spin-echo NMR studies of glasses in the system CdGe{sub x}As{sub 2} (0 {le} x {le} 1) suggest a close relationship between the structural organizations of glassy CdAs{sub 2}, CdGeAs{sub 2}, and glasses with intermediate Ge contents. The Cd environments are found to be strikingly different from those present in crystalline CdAs{sub 2} and CdGeAs{sub 2} and most closely resemble those in Cd{sub 3}As{sub 2}. These results are consistent with partial segregation into cadmium-rich and cadmium-depleted domains and implicate the known metastable Cd{sub 3}As{sub 2}-As eutectic in the binary Cd-As phase diagram in governing glass formation in these systems.