69,71Ga solid state static, MAS and DAS NMR study of β-Ga2O3

Abstract

We report solid state NMR results using both 69 Ga and 71 Ga in crystalline β-Ga2 O3 . In the β-Ga2 O3 structure Gallium occupies both octahedral and tetrahedral sites which can be distinguished by analyzing the central transition lineshape of both nuclei. These static lineshapes extend over more than one MHz. A procedure to acquire such a wide linshape as a Variable Offset Cumulative Spectrum using full echo acquisition and without going to a point by point acquisition is described. In addition to static experiments, two dimensional 71 Ga dynamic-angle spinning results resolving both tetrahedral and octahedral sites in the isotropic dimension are obtained.