Abstract
The quadrupolar splitting of the Na23 nuclear magnetic resonance signal has been studied in single crystals of borax, Na2B4O7·10H2O, and tincalconite, Na2B4O7·5H2O, placed in magnetic fields of 7536 and 5645 G, respectively. The resonance spectra show that the sodium atoms in both minerals occupy special positions with two unique sites in borax and three in tincalconite. The electric quadrupole coupling constants eqQ/h and asymmetry parameters η at these sites were determined to be BoraxTincalconiteWyckoff positionaed or eca or beqQ/h (kc/sec)541±3849±4539±2785±21299±1η0.449±0.0150.143±0.0280.741±0.00500The orientations of the principal axes of the electric field gradient tensors for the above sites and their symmetry-related sites have also been determined.
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