Ar. Grimmer et al., MULTINUCLEAR (B-11, P-31) MAS NMR-SPECTROSCOPY OF BOROPHOSPHATES, Fresenius' journal of analytical chemistry, 357(5), 1997, pp. 485-488
B-11 and P-31 MAS NMR spectroscopy of three borophosphates was used to
monitor their phase composition via the isotropic chemical shifts. Ca
BPO5 and BPO4 represent nearly pure samples, SrBPO5 contains beta-Sr2P
2O7 as well as BPO4 as impurities. The anisotropic chemical shift data
provide additional information on the geometry and connectivity of th
e BO4 and PO4 building units.