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

• Authors: P. Alvarez , J. Sánchez-Marcos , J. Sanchez Llamazares , V. Franco , M. Reiffers , J. Blanco , P. Gorria
• Languages of publication: EN

Abstracts

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.

Keywords

EN

61.05.cp; 75.50.Tt; 75.30.Kz

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)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 5
• Pages: 867-869

Dates

published

2010-11

Contributors

author

P. Alvarez

• Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain

author

J. Sánchez-Marcos

• Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, Calvo Sotelo, s/n, 28049 Madrid, Spain

author

J. Sanchez Llamazares

• 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

V. Franco

• Departamento de Física de la Materia Condensada, ICMSE-CSIC, Universidad de Sevilla, Calvo Sotelo, s/n, P.O. Box 1065, 41080 Sevilla, Spain

author

M. Reiffers

• Institute of Experimental Physics, Watsonova 47, SK-04001 Košice, Slovakia

author

J. Blanco

• Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain

author

P. Gorria

• Departamento de Física, Universidad de Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain

References

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Identifiers

DOI

10.12693/APhysPolA.118.867