Magnetocaloric Properties of MnBi Compound as a Function of Grain Size
| Autor: | Michaela Küpferling, E.S. Olivetti, L. Martino, Vittorio Basso, Carmen Curcio |
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| Rok vydání: | 2016 |
| Předmět: |
Kinetic Effect
Magnetocaloric Effect MnBi Horizontal scan rate Materials science Logarithm Condensed matter physics Transition temperature MnBi Magnetocaloric Effect Condensed Matter Physics Atomic and Molecular Physics and Optics Grain size Magnet Thermal Magnetic refrigeration Kinetic Effect General Materials Science Entropy (order and disorder) |
| Zdroj: | Solid State Phenomena. 257:143-146 |
| ISSN: | 1662-9779 |
| Popis: | MnBi is a magnetic material with many peculiar properties, interesting for different applications such as rare-earth-free permanent magnets and magnetic refrigeration. In this work the entropy change and the transformation kinetics of the magneto-structural transition are investigated, for two sets of samples with different grain size (“as-annealed” and “compacted pwd”). Both sets show a logarithm dependence on the temperature scan rate of the transition temperature upon cooling. This suggests that thermal activation effects are present. The estimated activation volume v0 of the magneto-structural transition corresponds to around 120 atoms. |
| Databáze: | OpenAIRE |
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