Spectral editing in MAS NMR of aprotic solids P---Cd cross-polarization and heteronuclear double-quantum filtering studies in II-IV-V2 semiconductor alloys

Magic-angle-spinning NMR spectra of aprotic solids, ceramics and glasses frequently suffer from poor site resolution due to wide chemical shift distribution effects. In such cases, cross-polarization and heteronuclear double-quantum filtering experiments involving nuclei other than ¹H offer unique spectral editing capabilities. The utility of such assignment techniques for examining site populations in semiconductor alloys is demonstrated for the chalcopyrite systems CdGeAs_2−xP_x, CdSiAs_2−xP_x and Zn_xCd_1−xGeP₂. The results permit a distinction between local and non-local effects on experimental chemical shift trends and reveal that compositional dependences observed in these alloys are dominated by non-local chemical shift contributions.