Crystal structure refinement and stability of LaFe{sub x}Ni{sub 1-x}O{sub 3} solid solutions
- Universidad Nacional de Cordoba (Argentina)
- Universidad Nacional de La Plata (Argentina)
The crystal structure refinement of LaFe{sub x}N{sub 1-x}, O{sub 3} (0 {le} x {le} 1) solid solutions was determined and analyzed by means of Rietveld refinement from X-ray powder diffraction data. The solid solutions with 0 {le} x < 0.5 are isostructural with LaNiO{sub 3} and crystallize in the rhombohedral system, space group R{bar 3}c, while those with composition 0.5 < x {le} 1 are isoestructural with LaFeO{sub 3} and crystallize in the orthorhombic system, space group Pnma. All of the solutions are single phase except that with the intermediate composition (x = 0.5), where both phases are observed. The cell volume increases with the iron content. This can be ascribed to the larger ionic radius of Fe{sup 3+} (HS) compared to Ni{sup 3+} (LS). LaFe{sub 0.25}Ni{sub 0.75}O{sub 3} was found to be single phase when prepared at temperatures as high as 1000{degrees}C, indicating an increase in the stability of the perovskite phase at high temperatures when a relatively small amount of iron is substituted for Ni in LaNiO{sub 3}.
- OSTI ID:
- 613701
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 133; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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