Abstract
In this work, we present the results of the substitution of aluminum for iron in Pr2Fe17. The polycrystalline Pr2Fe17-xAlx samples (x = 0, 0.25, 0.5, 0.75 and 1) were prepared by arc melting under a high purity argon and homogenized at 1373K for one week to minimize the amount of other possible impurity phases. The samples were characterized using powder X ray diffraction (XRD) and were refined using Rietveld method with Full-prof program. The lattice parameters increases with the Al content (from a = 8.5646 Å and c = 12.4394 Å, for x = 0, to a = 8.6194 Å and c = 12.5163 Å, for x = 1) and all the samples crystallize in time R3m of the Th2Zn17. We can explain this increasing by the largest covalent radius of Al compared to Fe. In addition, we have shown that the Al substitution of Fe increases Tc from 285K (for x = 0) to 361K (for x = 1) due mainly to the magnetovolumic effect. The magnetocaloric effect (MCE) of these compounds has been investigated by measuring their magnetic properties. The magnetic entropy variation decreases slightly from 5.51 Jkg-1K-1 to 4.71 Jkg-1K-1 under a magnetic field change of 0 - 51.
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Bessais, L., Guetari, R., Bez, R., Zehani, K., Mliki, N., Cizmas, C.B. (2014). Structure and magnetocaloric effect of Pr2Fe17-xAlx . In: TMS 2014: 143rd Annual Meeting & Exhibition. Springer, Cham. https://doi.org/10.1007/978-3-319-48237-8_2
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DOI: https://doi.org/10.1007/978-3-319-48237-8_2
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48593-5
Online ISBN: 978-3-319-48237-8
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