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Magnetocaloric Effect in Nanostructured Pr_2Fe_{17} and Nd_2Fe_{17} Synthesized by High-Energy Ball-Milling

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Alvarez P., Sánchez-Marcos J., Sanchez Llamazares J., Franco V., Reiffers M., Blanco J., Gorria P.
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issue 5
867-869
EN
Nanocrystalline Pr_2Fe_{17} and Nd_2Fe_{17} powders with rhombohedral Th_2Zn_{17}-type crystal structure and average particle sizes around 20 nm have been obtained by high-energy ball milling. While the bulk alloys show a well-defined and sharp drop in the low-field magnetization curve at the Curie temperature, T_{C} = 285 K (Pr) and 335 K (Nd), the ball-milled samples exhibit a substantial broadening of the ferro-to-paramagnetic transition due to a considerable augmentation of the disordered inter-grain boundaries. The latter results in an increase of more than 25% in the values of the full width at half maximum of the temperature dependence of the magnetic entropy change maintaining almost unchanged the relative cooling power.
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