Vibrational spectrum of KMIIP3O9 tricyclophosphates with the benitoite structure

High-temperature reactions in the Co3Cr4(PO4)6–Cr(PO3)3 system

“…Univocal attribution of the recorded absorption bands to the specific vibrations is not possible, because the full structure of the new compound is unknown. However, probable attribution can be made in the light of literature data [20][21][22][23][24][25]. IR spectrum of CoCr 2 (P 2 O 7 ) 2 is complex, but in general, four characteristic groups of bands are observed in the range 1500-300 cm -1 .…”

“…The absorption bands at 970, 945, 925 are assigned to the asymmetric stretching vibration of P-O-P linkages, while High-temperature reactions in the Co 3 Cr 4 (PO 4 ) 6 -Cr(PO 3 ) 3 system 99 the relatively weak band around 725 cm -1 is due to the symmetric stretching vibration of those linkages: P-O-P [20][21][22][23]. A weak band registered at 745 cm -1 occurring in the IR spectrum of CoCr 2 (P 2 O 7 ) 2 is probably due to symmetric stretching vibration of the P-O bonds with an internal oxygen atom [23,24]. The shoulder at about 625 cm -1 can be assigned to asymmetric bending vibrations of the O-P-O groups [20,21] and to stretching vibrations of the Cr-O bonds [20,23,25].…”

Chemical preparation, kinetics of thermal behavior and infrared studies of Pb3(P3O9)2.3H2O and Cd3(P3O9)2.14H2O

“…3a, 4a) (Fig. 3a, 4a) show bending vibration bands characteristic of phosphates with ring anions [20][21][22][23] . The vibrations corresponding to the different observed bands are given in Table 2.…”

“…-Between 600 and 400 cm -1 the spectra (Fig. 3d, 4c and 4d) show bending vibration bands characteristic of long-chain polyphosphates [20][21][22] . The nature of the vibration corresponding to the different observed bands is given in Table 3.…”

“…1b), nor exhibit the IR absorption bands characteristic of a cyclic phosphate P 3 O 9 3- (Fig. 2b) [20][21][22][23] 27 . The latter result is confirmed by chemical analyses, X-ray diffraction (Fig.…”