Correlation between Magnetic Properties and Mn/Co Atomic Order in LaMn0.5Co0.5O3+δ. 2. Magnetic and Calorimetric Properties
| Autor: | Ryutaro Yamazaki, Mitsuru Itoh, Tôru Kyômen |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Diffraction Quenching Condensed matter physics Annealing (metallurgy) General Chemical Engineering Analytical chemistry General Chemistry Polymer Heat capacity Magnetic susceptibility Condensed Matter::Materials Science Magnetization chemistry Ferromagnetism Materials Chemistry |
| Zdroj: | Chemistry of Materials. 16:179-184 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm030279t |
| Popis: | Correlation between magnetic properties and Mn/Co atomic order in LaMn0.5Co0.5O3+δ was investigated by powder X-ray diffraction, dc magnetization, ac magnetic susceptibility, and heat capacity measurements. The Mn/Co atomic order was controlled by annealing at some temperatures and successive quenching. The qualitative and quantitative magnetic properties depend on whether the annealing temperature is above or below 1400 K. The samples annealed below 1400 K showed a clear heat capacity anomaly and deviation from Curie−Weiss law due to ferromagnetic critical fluctuation. On the other hand, the samples quenched from above 1400 K showed an unclear heat capacity anomaly, downward deviation from Curie−Weiss law, and asymmetric M−H loop after high-field cooling. These results suggest that the long-range ordering of the Mn/Co atomic configuration occurs at around 1400 K, that the long-range ferromagnetic ordering occurs only when the long-range order of Mn/Co atomic configuration is present, and that ferromagnet... |
| Databáze: | OpenAIRE |
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