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Abstracts
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.
Discipline
- 75.50.Tt: Fine-particle systems; nanocrystalline materials
- 61.05.cp: X-ray diffraction
- 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)
Journal
Year
Volume
Issue
Pages
867-869
Physical description
Dates
published
2010-11
Contributors
author
- Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain
author
- Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, Calvo Sotelo, s/n, 28049 Madrid, Spain
author
- Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José, 2055, Col. Lomas 4^a, San Luis Potosí, S.L.P. 78216, Mexico
author
- Departamento de Física de la Materia Condensada, ICMSE-CSIC, Universidad de Sevilla, Calvo Sotelo, s/n, P.O. Box 1065, 41080 Sevilla, Spain
author
- Institute of Experimental Physics, Watsonova 47, SK-04001 Košice, Slovakia
author
- Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain
author
- Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain
References
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- 4. P. Gorria, J.L. Sánchez-Llamazares, P. Alvarez, M.J. Pérez, J. Sánchez-Marcos, J.A. Blanco, J. Phys. D, Appl. Phys. 41, 192003 (2008)
- 5. P. Álvarez, P. Gorria, V. Franco, J. Sánchez-Marcos, M.J. Pérez, J.L. Sánchez Llamazares, I. Puente Orench, J.A. Blanco, J. Phys., Condens. Matter 22, 216005 (2010)
- 6. P. Gorria, D. Martínez-Blanco, M.J. Pérez, J.A. Blanco, A. Hernando, M.A. Laguna-Marco, D. Haskel, N. Souza-Neto, R.I. Smith, W.G. Marshall, G. Garbarino, M. Mezouar, A. Fernández-Martínez, J. Chaboy, L. Fernandez Barquín, J.A. Rodriguez Castrilló n, M. Moldovan, J.I. García Alonso, J. Zhang, A. Llobet, J.S. Jiang, Phys. Rev. B 80, 064421 (2009)
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv118n5062kz