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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/4545

Title: Raman and infrared spectral analysis of thallium niobyl phosphates: Tl2NbO2PO4, Tl3NaNb4O9(PO4)2 and TlNbOP2O7
Authors: Junaid, Bushiri M
Jayasree, R S
Fakhfakh, M
Nayar, V U
Keywords: Raman spectra
IR spectra
Niobyl phosphates
NbO6 octahedra
PO4 tetrahedra
P2O7 4− anion
Issue Date: 2002
Publisher: Elsevier
Abstract: Raman and infrared spectra of Tl2NbO2PO4, Tl3NaNb4O9(PO4)2 and TlNbOP2O7 are reported. The observed bands are assigned in terms of vibrations of NbO6 octahedra and PO4 tetrahedra in the first two compounds and in terms of NbO6 octahedra and P2O7 4− anion in the third compound. The NbO6 octahedra in all the title compounds are found to be corner-shared and distorted. The higher wavenumber values of the ν1 (NbO6) mode and other stretching modes indicate that the NbO6 octahedra in them are distorted in the order TlNbOP2O7 > Tl2NbO2PO4 > Tl3NaNb4O9(PO4)2. The splitting of the ν3 (PO4) mode indicates that PO4 tetrahedra is distorted more in Tl2NbO2PO4 than in Tl3NaNb4O9(PO4)2. The symmetry of P2O7 4− anion in TlNbOP2O7 is lowered. Bands indicate that the P–O–P bridge in the above compound has a bent P–O–P bridge configuration
Description: Materials Chemistry and Physics 73 (2002) 179–185
URI: http://dyuthi.cusat.ac.in/purl/4545
Appears in Collections:Dr.Junaid Bushiri M

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