Anomalies in magnetic susceptibility of nonstoichiometric Nd2NiO4+δ (δ=0.049, 0.065, 0.077, 0.234)
| Autor: | Mustapha Zaghrioui, I. Laffez, Fabien Giovannelli, N.Poirot D. Brouri |
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| Rok vydání: | 2004 |
| Předmět: |
Curie–Weiss law
Condensed matter physics Rietveld refinement Chemistry Reducing atmosphere Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Magnetization Tetragonal crystal system Charge ordering Crystallography Materials Chemistry Ceramics and Composites Orthorhombic crystal system Physical and Theoretical Chemistry |
| Zdroj: | Journal of Solid State Chemistry. 177:3351-3358 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2004.05.065 |
| Popis: | We have investigated the influence of oxygen excess on structural and physical properties of the Nd2NiO4+δ compounds. Using the citrate method and subsequent annealing in air and in a reducing atmosphere a various oxygen-doped compounds were prepared. X-ray diffraction at room temperature shows that structure is strongly oxygen excess dependent. Thus, by increasing δ by up to 0.077, the compounds adopt a tetragonal structure gradually with a biphasic domain between orthorhombic and tetragonal structures. And at higher δ values, the structure becomes orthorhombic. Moreover, Rietveld analysis shows that for δ |
| Databáze: | OpenAIRE |
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