SYNTHESIS AND CHARACTERIZATION OF MIXED ZNSE GAP SEMICONDUCTOR SPECIES INCLUDED IN THE SODALITE STRUCTURE/

The synthesis of the solid solution series GaxZn(8-x)PxSe(2-x)[BO2]12 (x = 0, 0.5, 1, 2) is reported and the local and average long-range st ructures are discussed based on X-ray diffraction data, UV/visible spe ctroscopic measurements, and a variety of field-dependent static and m agic angle spinning solid state NMR experiments. Inclusion of GaP with in the borate sodalite analogue results in the formation of an isolate d P-32, Ga-69,Ga-71 spin pair that exhibits resolved scalar coupling i n the P-31 MAS NMR spectra. The analysis reveals that there are four d ifferent intracage structures distributed in small domains throughout the powdered materials and these are identified as [Zn4Se]6+, [GaZn3P] 6+, [Zn4P]5+ and, by inference, [Ga2Zn2P]7+. P-31 spin diffusion exper iments suggest that the materials are single phase solid solutions, an d powder X-ray diffraction data, which do not reveal more than one pha se for any composition, support this conclusion.