Structural effects of Sr substitution in La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}}
Journal Article
·
· Physical Review, B: Condensed Matter
- Princeton Materials Institute and Department of Geosciences, Princeton University, Princeton, New Jersey08544 (United States)
- Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, Stanford, California94309 (United States)
Structures within the La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} system (0{lt}x{le}1) were refined by Rietveld analysis of powder x-ray-diffraction data. Our results reveal three distinct regimes that parallel energetic transformations within the series. For 0{le}x{lt}0.2, enthalpies of oxidation are strongly exothermic and the compounds are monophasic and orthorhombic. Hole saturation occurs for 0.2{lt}x{lt}0.6, and the symmetry decreases from orthorhombic to monoclinic. For 0.6{lt}x{lt}1.0, diffraction patterns suggest phase immiscibility between a Sr-poor, hole-saturated compound and a Sr-rich phase for which oxidation is strongly favored. Fourier synthesis maps for all compositions revealed evidence for microtwinning and positional disorder among apical oxygen atoms. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 627830
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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