Published 1993
| Version v1
Journal article
Crystal chemistry of the diluted solid solution YCaCrxAl1-xO4 (x≤0.07) at 1273 K: reversed trends in the anisotropy of the K2NiF4 type structure
- 1. Orleans Univ., 45 (France)
- 2. Saint-Petersburg University (Russian Federation)
Description
Crystal chemistry as deduced from an X-ray diffraction powder study shows up a main feature: the overall anisotropy of the perovskite / rocksalt 1/1 intergrowth is reversed, as compared to the RT data i.e. the (A1, Cr)-Oapical distance no longer increases: consequently, the octahedra are more symmetrical. Such a phenomenon is enhanced by Cr3+ cations in agreement with their isotropic 'd3' electronic configuration. From that result, one can point out a lowering of the 2D character of the K2NiF4 structure at high temperature, in so far as pure geometrical effects are concerned
Additional details
Publishing Information
- Journal Title
- European Journal of Solid State and Inorganic Chemistry
- Journal Volume
- 30
- Journal Issue
- 6
- Journal Page Range
- p. 619-628.
- ISSN
- 0992-4361
- CODEN
- EJSCE5
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 24068900
- Subject category
- S36: MATERIALS SCIENCE; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- ALUMINIUM OXIDES; ANISOTROPY; CALCIUM OXIDES; CHROMIUM OXIDES; CRYSTAL STRUCTURE; INTERATOMIC DISTANCES; SOLID SOLUTIONS; STOICHIOMETRY; TEMPERATURE RANGE 1000-4000 K; X-RAY DIFFRACTION; YTTRIUM OXIDES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; CHROMIUM COMPOUNDS; COHERENT SCATTERING; DIFFRACTION; DISPERSIONS; DISTANCE; HOMOGENEOUS MIXTURES; MIXTURES; OXIDES; OXYGEN COMPOUNDS; SCATTERING; SOLUTIONS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS