The infrared and Raman spectra of β-TaPO5 and β-NbPO5

Stranford, G.T.; Condrate, R. A.

doi:10.1007/bf00729379

Cited by 29 publications

(7 citation statements)

References 5 publications

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“…5. By the doping of niobium ion into the amorphous TiP 2 O 7 , the relative Raman intensity at 337 and 762 cm −1 corresponding to P O P bending and symmetric stretching modes decreased [14], while the Nb O stretching mode at 645 cm −1 increased [13,15,16]. Therefore, the increase in the intensity of this Nb O band corresponds to the promotion of non-bridging oxygen species in the samples.…”

Section: Resultsmentioning

confidence: 97%

New sunscreen materials based on amorphous cerium and titanium phosphate

Masui

Hirai

Imanaka

et al. 2006

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 97%

New sunscreen materials based on amorphous cerium and titanium phosphate

Masui

Hirai

Imanaka

et al. 2006

Journal of Alloys and Compounds

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“…Features at 2990, 2936 and 2910 cm À1 (C-H stretching of methyl and methylene groups, n C-H ) 41 conrm the presence of coordinated alkoxo or alcohol species, while the IR bands between 580 and 680 cm À1 are related to Nb-O stretching of NbO 6 octahedra coupled with the bending vibrations of PO 4 groups. 37 Moreover, all dried gels exhibit a broad absorption band in the range 3000-3750 cm À1 centred at about 3450 cm À1 with two shoulders at about 3640 and 3240 cm À1 . This broad band arises from O-H stretches (n O-H ) involved in hydrogen bonding, while the shoulders at 3640 and 3240 cm À1 are related to free and strongly H-bonded OH groups, respectively.…”

Section: Raman and Infrared Spectroscopymentioning

confidence: 93%

Phosphorus stably bonded to a silica gel matrix through niobium bridges

et al. 2015

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For the first time niobium-phosphorus-silicon mixed oxide gels xNb2O5·xP2O5·(100 - 2x)SiO2, with x = 2.5 (2.5PNb), 5 (5PNb), 7.5 (7.5PNb) and 10 (10PNb), were synthesized at room temperature by an innovative sol-gel route from phosphoryl chloride, niobium chloride and tetraethoxysilane. Thermogravimetry/differential thermal analysis, X-ray diffraction, solid state 29Si and 31P NMR, Raman and Fourier transform infrared spectroscopy were used to examine the structure of dried and heat-treated (1 h at 500 °C) gels. The synthesis procedure developed in this work allowed obtaining, for each studied composition, transparent chemical gels by means of careful control of the precursor reactivity. Amorphous dried gels were obtained which were characterized by a very high degree of silicon cross-linking. Moreover, Si-O-Nb bridges were formed which allowed phosphorus to be anchored stably through Nb-O-P bonds within the gel. All heat-treated gels retain their amorphous nature with a high content of OH groups that are mainly linked to phosphorus, making them strong acidic solids

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“…The Nb-O stretching modes are usually observed in the 580-890 cm −1 region [14]. In Raman spectra (Fig.…”

Section: Factor Group Analysismentioning

confidence: 95%

Raman and infrared spectral analysis of thallium niobyl phosphates: Tl2NbO2PO4, Tl3NaNb4O9(PO4)2 and TlNbOP2O7

Bushiri

Jayasree

Fakhfakh

et al. 2002

Materials Chemistry and Physics

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Raman and infrared spectra of Tl 2 NbO 2 PO 4 , Tl 3 NaNb 4 O 9 (PO 4 ) 2 and TlNbOP 2 O 7 are reported. The observed bands are assigned in terms of vibrations of NbO 6 octahedra and PO 4 tetrahedra in the first two compounds and in terms of NbO 6 octahedra and P 2 O 7 4− anion in the third compound. The NbO 6 octahedra in all the title compounds are found to be corner-shared and distorted. The higher wavenumber values of the ν 1 (NbO 6 ) mode and other stretching modes indicate that the NbO 6 octahedra in them are distorted in the order TlNbOP 2 O 7 > Tl 2 NbO 2 PO 4 > Tl 3 NaNb 4 O 9 (PO 4 ) 2 . The splitting of the ν 3 (PO 4 ) mode indicates that PO 4 tetrahedra is distorted more in Tl 2 NbO 2 PO 4 than in Tl 3 NaNb 4 O 9 (PO 4 ) 2 . The symmetry of P 2 O 7 4− anion in TlNbOP 2 O 7 is lowered. Bands indicate that the P-O-P bridge in the above compound has a bent P-O-P bridge configuration.

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The infrared and Raman spectra of β-TaPO5 and β-NbPO5

Cited by 29 publications

References 5 publications

New sunscreen materials based on amorphous cerium and titanium phosphate

New sunscreen materials based on amorphous cerium and titanium phosphate

Phosphorus stably bonded to a silica gel matrix through niobium bridges

Raman and infrared spectral analysis of thallium niobyl phosphates: Tl2NbO2PO4, Tl3NaNb4O9(PO4)2 and TlNbOP2O7

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