Published January 15, 1989
| Version v1
Journal article
Oxygen vacancy ordering in the defect pyrochlore Pb2[TiSb]O6.5: A Rietveld refinement of neutron powder diffraction data
- 1. Consejo Superior de Investigaciones Cientificas, Madrid (Spain). Inst. de Ciencia de Materiales
- 2. Institut Max von Laue - Paul Langevin, 38 - Grenoble (France)
Description
Mr=688.13, cubic, Fanti 43m, a=10.4109 (2) A, V=1128.40 (6) A3, Z=8, Dx=8.10 Mg m-3, neutron powder diffraction (Rietveld method), λ=1.9109 A, T295 K, Rp=5.40, Rwp=7.14, Re=5.48, RI=1.69% for 52 integrated Bragg intensities, goodness of fit Rg=1.70. Oxygen coordination polyhedra for Ti,Sb are nearly regular octahedra, whereas that for Pb is a scalenohedron with the eight vertex unoccupied. The Pb atoms are displaced by 0.040 (4) A along th [111] direction from the ideal Fdanti 3m pyrochlore structure, producing small tetrahedral cages [Pb-Pb distances 3.617 (3) A] inside which the oxygen vacancies show an ordered arrangement. (orig.)
Additional details
Publishing Information
- Journal Title
- Acta Crystallographica, Section C
- Journal Volume
- 45
- Journal Issue
- 1
- Series
- Acta Crystallogr., Sect. C.
- Journal Page Range
- 3-7
- ISSN
- 0108-2701
- CODEN
- ACSCE
INIS
- Country of Publication
- Denmark
- Country of Input or Organization
- Denmark
- INIS RN
- 20031139
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANTIMONY OXIDES; CRYSTAL STRUCTURE; CUBIC LATTICES; EXPERIMENTAL DATA; INTERATOMIC DISTANCES; LATTICE PARAMETERS; LEAD OXIDES; MEDIUM TEMPERATURE; NEUTRON DIFFRACTION; POWDERS; TITANIUM OXIDES; VACANCIES
- Descriptors DEC
- ANTIMONY COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTAL LATTICES; DATA; DIFFRACTION; DISTANCE; INFORMATION; LEAD COMPOUNDS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; POINT DEFECTS; SCATTERING; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS