Rietveld refinements of the solid solution Li{sub (1-2x)}Ni {sub x}TiO(PO{sub 4}) (0 {<=} x {<=} 0.50)
- Laboratoire de Chimie des Materiaux Solides, Faculte des Sciences Ben M'Sik Boulevard Idriss El Harti, Sidi Othman, B.P. 7955 Casablanca (Morocco)
- Institut de Chimie de la Matiere Condensee de Bordeaux, 87, Av. du Dr. Schweitzer, 33608 Pessac Cedex (France)
Li{sub (1-2x)}Ni {sub x}TiO(PO{sub 4}) oxyphosphates with 0 {<=} x {<=} 0.10 crystallize in the orthorhombic system with the space group Pnma, those with 0.10 < x {<=} 0.25 crystallize in the monoclinic system with the space group P2{sub 1}/c and compositions with 0.25 < x < 0.50 present a mixture of the limit of the solid solution Li{sub 0.50}Ni{sub 0.25}TiO(PO{sub 4}) and Ni{sub 0.50}TiO(PO{sub 4}). The structure of the compositions 0 {<=} x {<=} 0.25 is based on a three-dimensional anionic framework constructed of chains of alternating TiO{sub 6} octahedra and PO{sub 4} tetrahedra, with the lithium and nickel atoms in the cavities in the framework. The dominant structural units in the compositions are chains of tilted corner-sharing TiO{sub 6} octahedra running parallel to one of the axis. The oxygen atoms of the shared corners, not implied in (PO{sub 4}) tetrahedra, justify the oxyphosphate designation. Titanium atoms are displaced from the geometrical center of the octahedra resulting in alternating long ({approx}2.25 A) and short ({approx}1.71 A) Ti-O(1) bonds. The four remaining Ti-O bond distances have intermediate values ranging from 1.91 to 2.06 A.
- OSTI ID:
- 20889728
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 40; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis, structure refinement and characterisation of a new oxyphosphate Mg{sub 0.50}TiO(PO{sub 4})
Synthesis, structure, magnetic susceptibility and Mossbauer and Raman spectroscopies of the new oxyphosphate Fe{sub 0.50}TiO(PO{sub 4})