I.r. and Raman spectra of M3HP2O7·nH2O (M = Na, Cs; n = 0, 1, 9). Correlation between the POP bridge vibrational frequencies and the POP angle value

Influence of Bi2O3 on optical properties and structure of bismuth lithium phosphate glasses

“…5(a) and (b) shows that with increasing Bi 2 O 3 content, the band shifts towards higher frequency, which indicates that these bands are associated with the vibrations of Bi-O bonds. Moreover the increase of the frequency of (P-O-P) as groups (from 900 to 915 cm −1 ) is in accordance with the presence of pyrophosphate groups [55,56] and the frequency of (PO 2 ) s groups are shifting towards lower wave number. The intensity of the band at 1100 cm −1 does not change when compared with the intensity of as of P-O-P bridges at 900 cm −1 .…”

(NH4)2[Ni(H2P2O7)2(H2O)2]

“…The interpretation and assignment of Raman bands of (NH 4 ) 2 Ni(H 2 P 2 O 7 ) 2 Á2H 2 O (see Table 3) can be made in terms of PO 2 groups, POH groups, the P-O-P bridge, as well as NH 4 + and H 2 O (Sarr & Diop, 1987). These data confirm the presence of the different entities in the title compound.…”

Effect of Bi2O3 on structure and properties of zinc bismuth phosphate glass

“…16) Figure 5 shows that with increasing Bi2O3 content, the band shifted towards a higher frequency, which suggests that these bands are associated with the vibrations of Bi-O bonds. Moreover, the increase in frequency of (P-O-P)as groups (from 900 to 915 cm ) is in accordance with the presence of pyrophosphate groups 17), 18) and the frequency of (PO2)s groups are shifting towards a lower wave number. The intensity of the band at 1100 cm -1 did not change when compared to the intensity of vas of the P-O -P bridges at 900 cm -1 .…”