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Microstructure and magnetocaloric effect in cast LaFe11.5Si1.5Bx (x=0.5, 1.0) |
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| Authors: | H. Zhang Y. Long Ya. Mudryk K.A. Gschneidner Jr. V.K. Pecharsky |
| Affiliation: | a School of Materials Science and Engineering, University of Science and Technology of Beijing, 100083 Beijing, PR China b The Ames Laboratory, US Department of Energy, Iowa State University, Ames, IA 50011-3020, USA c Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-2300, USA |
| Abstract: | Phase formation, structure, and the magnetocaloric effect (MCE) in as-cast LaFe11.5Si1.5Bx (x=0.5, 1.0) compounds have been studied. The Curie temperatures, TC, are ∼211 and 230 K for x=0.5 and 1.0, respectively, which are higher than that of annealed LaFe11.5Si1.5 (TC=183 K), while the maximum magnetic entropy changes at the respective TC under a magnetic field change of 0-5 T are 7.8 and 5.8 J/(kg K). Wavelength dispersive spectrometry (WDS) analysis shows that only a small fraction of boron atoms is dissolved in the NaZn13-type structure phase, and that the compositions of the as-cast LaFe11.5Si1.5Bx (x=0.5, 1.0) alloys are much different from the intended nominal compositions. These as-cast alloys exhibit second-order magnetic phase transitions and low MCEs. However, based on the relative cooling power, the as-cast LaFe11.5Si1.5Bx alloys are promising candidates for magnetic refrigerants over a wide temperature range. |
| Keywords: | NaZn13 Magnetocaloric effect Wavelength dispersive spectrometry (WDS) |
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