MANOUN, B.; EL JAZOULI, Abdelaziz; GRAVEREAU, Pierre; CHAMINADE, Jean-Pierre; BOURÉE, Françoise

doi:10.1154/1.1515299

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MANOUN, B.
Laboratoire de Chimie des Matériaux Solides

EL JAZOULI, Abdelaziz
Laboratoire de Chimie des Matériaux Solides

GRAVEREAU, Pierre
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Powder Diffraction. 2002, vol. 17, n° 4, p. 290-294

Cambridge University Press (CUP)

Résumé en anglais

The structure of the oxyphosphate Li0.50Ni0.25TiO(PO4) has been determined from conventional X-ray and neutron powder diffraction data. The parameters of the monoclinic cell (space group P21/c, Z=4), obtained from X-ray results, are: a=6.3954(6) Å, b=7.2599(6) Å, c=7.3700(5) Å, and β=90.266(6)°; those resulting from neutron study are: a=6.3906(7) Å, b=7.2568(7) Å, c=7.3673(9) Å, and β=90.234(7)°. Refinement by the Rietveld method using whole profile, leads to satisfactory reliability factors: cRwp=0.128, cRp=0.100, and RB=0.038 for X-ray and cRwp=0.110, cRp=0.120, and RB=0.060 for neutrons. The structure of Li0.50Ni0.25TiO(PO4) can be described as a TiOPO4 framework constituted by chains of tilted corner-sharing TiO6 octahedra running parallel to the c axis and cross linked by phosphate tetrahedra. In this framework, there are octahedral cavities occupied by Li and Ni atoms: Li occupies the totality of the 2a sites and Ni occupies statistically half of the 2b sites. Ti atoms are displaced from the center of octahedra units in alternating long (2.242 Å) and short (1.711 Å) Ti-O bonds along chains.< Réduire

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X-rays

Neutrons

Titanyl oxyphosphate

Structure determination

Rietveld refinement

Powder diffraction

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Determination and Rietveld refinement of the crystal structure of Li0.50Ni0.25TiO(PO4) from powder x-ray and neutron diffraction

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