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CaHPO 4  and SrHPO 4  were investigated using Raman,  1 H NMR and  31 P NMR techniques to study the environment of their PO 3−  4  tetrahedra and the percentage of mobile protons.  1 H NMR spectra at room temperature suggest the presence of three types of protons, in agreement with RX investigation. The percentage of mobile protons in SrHPO 4  is greater than in CaHPO 4  because Sr 2+  is bigger than Ca 2+ .  31 P NMR spectra at room temperature show two lines in the spectrum of SrHPO 4 , revealing an equal environment of two sets of pairs of PO 3−   4  . The  31 P NMR spectrum of CaHPO 4 , however, exhibits three lines. This result was confirmed using a cross polarization (CP) sequence program. The first peak is attributed to the first set of pairs of P(1)O 4  units and the two other ones to P(2)O 4  and P(2)O 4  units.

1 H NMR, 31 P NMR and Raman Study of CaHPO 4 and SrHPO 4