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Vibrational spectra of double diphosphates CsLnP2O7 (Ln=Gd, Tb, Dy, Ho, Y, Er, Tm, Yb)

2001; Elsevier BV; Volume: 323-324; Linguagem: Inglês

10.1016/s0925-8388(01)01148-3

1873-4669

N. Khay, A. Ennaciri,

Luminescence Properties of Advanced Materials

Raman and infrared absorption spectra of diphosphates CsLnP2O7 (Ln=Gd, Tb, Dy, Ho, Y, Er, Tm, Yb) have been recorded and interpreted using factor group analysis. The spectral features predicted with factor group arising from the X-ray crystallographic space group P21/c (C2h5) for these compounds fit the observed results. Non-coincidences observed between most infrared and Raman bands confirmed that these materials possess the centrosymmetric structure. The similarities between the vibrational spectra of CsLnP2O7 suggested that they are isostructural. The shift of the frequencies νas (POP) and νs (POP) on the vibrational spectra is due to the influence of the cation Ln3+ on the P-O-P bridge angle. The POP angle values were estimated using the Lazarev's relationship.