Vibrational spectra of R(PO₃)₃ metaphosphates (R = Ga, In, Y, Sm, Gd, Dy)

Abstract

A series of R(PO 3 ) 3 (R = Ga, In, Y, Sm, Gd, Dy) metaphosphate crystals representing four different structural types were prepared and their vibrational spectra recorded. The distribution of internal and external chain modes was obtained taking into account the configuration (site symmetry) of the polyphosphate anions in the corresponding structures. The spectra presented reveal that the P -O − force constants are very sensitive to both the coordination of oxygen atoms and POP bond angles. The spectra of crystalline R(PO 3 ) 3 were compared with data for glassy metaphosphates. It was found that decreasing the size of R(III) cation leads to different structural effects in glasses and crystals of the same composition.

Disorder in LixFePO4: From glasses to nanocrystallites

“…We can make the hypothesis that this band is linked to a vibration mode of PO 3 . The same vibration mode has also been observed in R(PO 3 ) 3 metaphosphates (R = Ga, In, Y, Sm, Gd, Dy) in the range 1230-1280 cm À1 [28]. The other new feature is the absorption band located at 758 cm À1 for x = 0.…”

Synthesis, Characterization, and Crystal Structures of a New Coordination Polymer of Manganese(II) Containing Dimethyl Phosphate

“…Bands at 844 and 817 cm Ϫ1 corresponds to ν(P-O) of P-O-C phosphate ester fragment. Several bands in the 574-330 cm Ϫ1 spectral region are assigned to the ν(P-O-M) stretching vibrations [41]. Our experimental interpretations of the individual vibrational bands confirm the results of the previous findings on the infrared spectrum of solid NaDMP [42], and other ab initio computational calculations such as normal coordinate analysis of DMP [43].…”

Nanoscopic scale studies of LiFePO4 as cathode material in lithium-ion batteries for HEV application

“…Regarding now the final product, the only impurity that can be detected is the band at 1,226 cm −1 associated to NASICON. Indeed, lantern units building the Li 3 Fe 2 (PO 4 ) 3 lattice give rise to infrared bands in the range 1,150-1,250 cm −1 [30], which are attributed to the stretching vibrations of terminal PO 3 units because the NASICONlike phase shows the same vibrational modes that observed in R(PO 3 ) 3 metaphosphates (R=Ga, In, Y, Sm, Gd, Dy) in the range 1,230-1,280 cm −1 [31]. For the case of the sample heated at T s =400°C, this result corroborates the observation of this impurity phase on the XRD spectra.…”