The M1 site is an antiprism sharing faces with two AO 6 octahedra.The M2 site is a large cage bounded by 8 oxygens.

The monoclinic phosphates with K3Ln(PO4)2 (Ln=rare earth) formula were synthesized. Their infrared and Raman spectra have been reported and analysed. The results of a force field calculation for K3Nd(PO4)2 are presented.

The monoclinic pyrophosphates with AMP2O7 formula were synthesized. Their infrared and Raman spectra have been reported and analysed. The results of a force field calculation for CaCuP2O7 are presented.

The monoclinic phosphates with K(3)Ln(PO4)(2) (Ln = rare earth) formula were synthesized. Their infrared and Raman spectra have been reported and analysed. The results of a force field calculation for K3Nd(PO4)(2) are presented. (C) 2004 Elsevier B.V. All rights reserved.

The monoclinic pyrophosphates with AMP2O7 formula were synthesized. Their infrared and Raman spectra have been reported and analysed. The results of a force field calculation for CaCuP2O7 are presented.

In this paper, a vitreous domain of the ternary system: xLa2O3-yMgO-zB2O3 characterised by X-ray diffraction is shown. Structural approach using vibrational spectroscopy and optical probe is realized for some of these glasses and compared to crystalline LaMgB5O10.

In this paper, a vitreous domain of the ternary system: xLa(2)O(3)-yMgO-zB(2)O(3) characterised by X-ray diffraction is shown. Structural approach using vibrational spectroscopy and optical probe is realized for some of these glasses and compared to crystalline LaMgB5O10. (C) 2002 Elsevier Science B.V. All rights reserved.

The infrared and Raman spectra of triclinic phosphates SrM2(PO4)(2) where M = Co, Ni have been reported and analysed. The results of a force field calculation for SrNi2(PO4)(2) are presented. (C) 2002 Elsevier Science B.V. All rights reserved.

The infrared and Raman spectra of triclinic phosphates SrM2(PO4)2 where M = Co, Ni have been reported and analysed. The results of a force field calculation for SrNi2(PO4)2 are presented.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

This paper reports a structural approach of phosphates with general formula ACaLn(PO4)(2), with A = K, Rb, Cs and Ln = rare earth, using infrared and Raman spectroscopy and Eu3+ as local structural probe. ne results permit us to decide which of the two possible space groups is valid for these materials.

Raman and infrared spectra of 4-methyl-1,2,4-triazolethione showed that two crystalline phases, one stable and the other metastable, can be obtained from various crystallization processes. The metastable phase transforms into the stable phase at 395 K by an irreversible first-order phase transition. The two phases were characterized spectroscopically and structural properties are discussed. Copyright (C) 2000 John Whey & Sons, Ltd.

The structure of K2CsLa(VO4)(2) has been refined using 1098 reflections. The compound crystallizes in the monoclinic system with space group P2(1)/m and lattice parameters : a = 10.094 Angstrom, b = 5.991 Angstrom, c = 7.858 Angstrom, beta = 90.76 degrees and Z = 2. An assignment of all the vibrational modes characterized by Raman and infrared spectroscopies is proposed and confirmed by an analysis in normal coordinates.

We have synthesized and characterized the different solid state phases of RbCaLa(PO4)(2-y)(AsO4)(y) 0 less than or equal to y less than or equal to 2 by X-ray diffraction and Infrared Spectroscopy. Xray diffraction of these materials was achieved by isotype analysis with KCaNd(PO4)(2), whose structure derive from hexagonal CePO4. The aim of this study is to develop new materials that have improved optical properties for luminophors.

The IR and Raman spectra of triclinic diphosphates. AMP(2)O(7) (A :Ca, Ba; M: Mg, Co, Ni, Cu,Zn: Cd) have been analysed. Their study has confirmed the (phenomenon) of incommensurability in the case of BaNiP2O7 and revealed it for BaCoP2O7. The results of a force field calculation for BaCdP2O7 are presented. Correlation between the frequencies of the vibrational modes of the POP group and some structural parameters has been established.

Vibrational spectra of MX(2)TA and MX(2)TA(2) complexes have been studied in the region below 400 cm(-1) using C-2h and D-2h Line-group analysis, respectively. Assignments of stretching vibrations and some bending modes have been made. Some structural features have been outlined. Particularly, v((MN)) frequencies follow the ligand field stabilisation energies and Irving-Williams sequence. This result shows that all the complexes have the same geometry for metallic ion, octahedral one. The comparison of data obtained for TA complexes with those given previously for imidazole compounds show a more important retrodonation for the first ones.