Magnetocaloric effect in melt-spun Laves phase intermetallic compound HoCo2
| Autor: | J. Arout Chelvane, R. Nirmala, Satish K. Malik, J. Rajesh Krishna, S. Quezado, R. Rajivgandhi |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Intermetallic Thermodynamics 02 engineering and technology Laves phase 021001 nanoscience & nanotechnology Condensed Matter Physics Cooling capacity 01 natural sciences Isothermal process Electronic Optical and Magnetic Materials Ferromagnetism Transition metal 0103 physical sciences Magnetic refrigeration 0210 nano-technology Entropy (order and disorder) |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 448:351-354 |
| ISSN: | 0304-8853 |
| Popis: | Magnetic and magnetocaloric properties of the melt-spun HoCo 2 compound have been investigated. The sample orders ferrimagnetically at ∼94 K (T C ). This is about 14 K larger than that of the T C reported for the arc-melted HoCo 2 sample. This is found to be a second order transition whereas the arc-melted analogue is known to undergo a first order transition. Melt-spinning synthesis leads to micrograin formation in the sample. The maximum isothermal magnetic entropy change, ΔS m max , near T C of the melt-spun HoCo 2 is about −4.6 J kg −1 K −1 and −9.5 J kg −1 K −1 for 20 kOe and 50 kOe field changes, respectively. The corresponding refrigeration capacity and relative cooling power values are 115 J/kg and 148 J/kg for 20 kOe field change and 308 J/kg and 398 J/kg for 50 kOe field change. The relative cooling power is nearly equal to that of the arc-melted sample because the change of order of transition leads to broadening of ΔS m vs T curve. The increase in T C could be due to the enhanced ferromagnetic interactions present in the transition metal sublattice of the melt-spun HoCo 2 . |
| Databáze: | OpenAIRE |
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