In and Bi counterparts, primarily owing to its smaller nuclear quadrupole moment ( Q Nb 93 = -32(2) fm ). Combined with its slightly higher frequency ( ❑ Nb 93 = 6.5674  10 7 rad s -1 T -1 ) and 100% natural abundance, Nb has been used to provide insights on a wide range of materials. Owing to quadrupolar broadening, In and Bi NMR studies are infrequent. Both nuclei have been studied in a number of halide systems and molecular compounds .