Abstract
Abstract We have performed at room temperature a detailed investigation of the electric field gradient (EFG) tensors at the Na sites in several LiNaSO4 single crystals in order to resolve inconsistencies between our NMR data and the hitherto accepted crystal structure P31c of β-LiNaSO4. We have found 12 rather than 6 different EFG tensors which fall into two sets with six tensors each. The two sets transform into each other by a mirror plane perpendicular to the trigonal axis and not present in the P31c space group. This calls for a revision of the crystal structure.
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