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Crystals 2017, 7(6), 156; doi:10.3390/cryst7060156

Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

1
Laboratoire des Sciences des Matériaux et de l’Environnement, Faculté des Sciences de Sfax-Université de Sfax, BP 1171, 3018 Sfax, Tunisie
2
Chemistry Departement, College of Science and Arts at Ar-Rass, Qassim University, P.O. Box53, Buraydah 51452, Saudi Arabia
3
Laboratoire de Magnétisme et Spectroscopie des Solides, Département de Physique, Faculté des Sciences, Université Badji Mokhtar-Annaba, B.P. 12, Annaba 23000, Algeria
4
Laboratoire de Physique appliqué, Département de Physique, Faculté des Sciences de Sfax, 3018 Sfax, Tunisie
5
Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, THIAIS F-94320, France
*
Author to whom correspondence should be addressed.
Academic Editor: Alex V. Morozkin
Received: 16 April 2017 / Revised: 9 May 2017 / Accepted: 13 May 2017 / Published: 27 May 2017
(This article belongs to the Special Issue Crystal Structure of Magnetic Materials)
View Full-Text   |   Download PDF [2076 KB, uploaded 27 May 2017]   |  

Abstract

The structural, magnetic, and magnetocaloric properties of Er6Fe23−xAlx (x = 0 and 3) intermetallic compounds have been studied systematically. Samples were prepared using the arc furnace by annealing at 1073 K for one week. Rietveld analysis of XRD shows the formation of pure crystalline phase with cubic Fm-3m structure. Refinement results show that the unit cell volume decreases with increasing Al content. The Curie temperature Tc of the prepared samples was found to be strongly dependent on the aluminum content. This reduces magnetization and the ferrimagnetic phase transition temperature (Tc) from 481 K (for x = 0) to 380 K (for x = 3), is due to the substitution of magnetic element (Fe) by non-magnetic atoms (Al). With the increase of the Al content, a decrease in the values of magnetic entropy is observed. The magnitude of the isothermal magnetic entropy (|∆SM|) at the Tc decreases from 1.8 J/kg·K for x = 0 to 0.58 J/kg·K for x = 3 for a field change 14 kOe. Respectively, the relative cooling power (RCP) decreases with increasing Al content reaching 42 Jkg−1 for x = 0 to 28 Jkg−1 for x = 3. View Full-Text
Keywords: intermetallic; rare earth; crystal structure; magnetocaloric effect; relative cooling power intermetallic; rare earth; crystal structure; magnetocaloric effect; relative cooling power
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Jemmali, M.; Alleg, S.; Dhahri, E.; Bessais, L. Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds. Crystals 2017, 7, 156.

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