Vibrational spectra and factor group analysis of lanthanide and zirconium phosphates MIII0.33Zr2(PO4)3, where MIII=Y, La–Lu

Synthesis and investigation of neptunium zirconium phosphate, a member of the NZP family: crystal structure, thermal behaviour and Mössbauer spectroscopy studies

“…It is identical to the spectra of the rare earth phases with the space group R3c. 27,37 The IR bands observed in the region from 500 to 640 cm −1 are assigned to the asymmetrical bending ν 4 vibrations of the PO 4 units, bands from 920 to 980 cm −1to symmetrical stretching ν 1 vibrations, and from about 1000 to 1280 cm −1to asymmetrical stretching ν 3 vibrations. As in the case of lanthanide zirconium phosphates, the position of the weak high-frequency band of asymmetric vibrations at 1280 cm −1 , which is generally not characteristic of phosphates, is explained by the contribution of a part of the electronic density of small and highly charged polarizing zirconium cations to the P-O bond.…”

Bi0.33Zr2(PO4)3, a negative thermal expansion material with a Nasicon-type structure

“…When the P–O stretching and bending vibrational modes of BZP were compared with M III 0.33 Zr 2 (PO 4 ) 3 compounds (where M III = Y, La–Lu), a blue shift was observed due to the high electronegativity (2.02) of the Bi ion. 40…”

“…(where M III = Y, La-Lu), a blue shift was observed due to the high electronegativity (2.02) of the Bi ion. 40…”

Synthesis, crystal structure and spectroscopic characterization of a new cadmium phosphate, Na2Cd5(PO4)4

“…The IR and Raman spectra of the synthesized powder sample (Fig. 7) are typical of a monophosphate [35,36]. The Raman spec trum of Na 2 Cd 5 (PO 4 ) 4 is dominated by a strong band situated…”