IR and polarized Raman Spectra of Na,P,O, -10H,O were recorded and analysed. From the spectra it is inferred that the P,O:-ion has C,, symmetry in the crystal. The S P 4 -P band is found to belong to the A , species. Multiple bands observed for the stretching and bending modes of water are probably due to hydrogen bonds of diffwent strengths and the correlation field efEect.
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