Enhancement of the refrigerant capacity in low level boron doped La0.8Gd0.2Fe11.4Si1.6

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dc.contributor.authorShamba, Pen_AU
dc.contributor.authorZeng, Ren_AU
dc.contributor.authorWang, JLen_AU
dc.contributor.authorCampbell, SJen_AU
dc.contributor.authorDou, SXen_AU
dc.date.accessioned2013-09-25T00:36:01Zen_AU
dc.date.available2013-09-25T00:36:01Zen_AU
dc.date.issued2013-06-01en_AU
dc.date.statistics2013-09-25en_AU
dc.description.abstractThe effects of boron doping on the itinerant-electron metamagnetic (IEM) transition and the magnetocaloric effects (MCEs) in the cubic NaZn13-type La0.8Gd0.2Fe11.4Si1.6 compound have been investigated. The Curie temperature, TC, of La0.8Gd0.2Fe11.4Si1.6Bx compounds with x=0, 0.03, 0.06, 0.2 and 0.3 was found to increase from 200 K to 222 K with increase in boron doping, x. The maximum values of the isothermal magnetic entropy change, Delta S-M, (derived using the Maxwell relation for a field change ΔB=0–5 T) in La0.8Gd0.2Fe11.4Si1.6Bx with x=0, 0.03, 0.06, 0.2 and 0.3 are 14.8, 16, 15, 7.5 and 6.6 J kg−1 K−1 respectively, with corresponding values of the refrigerant capacity, RCP of 285, 361, 346, 222 and 245 J kg−1. The large Delta S-M values observed for the undoped sample, and the low level B doped La0.8Gd0.2Fe11.4Si1.6B0.03 and La0.8Gd0.2Fe11.4Si1.6B0.06 compounds are attributed to the first order nature of the IEM transition while the decrease of Delta S-M at x=0.2 and 0.3 is due to a change in the second order phase transition with increase in B doping. The nature of the magnetic phase transitions is also reflected by the magnetic hysteresis of 3.7, 9, 5.7, 0.4 and 0.3 J kg−1 for x=0.0, 0.03, 0.06, 0.2 and 0.30 respectively. The possibility of tuning the TC and the magnetocaloric properties at temperatures close to room temperature make this system interesting from the points of view of both fundamental aspects as well as applications. © 2013, Elsevier Ltd.en_AU
dc.identifier.citationShamba, P., Zeng, R., Wang, J. L., Campbell, S. J., & Dou, S. X. (2013). Enhancement of the refrigerant capacity in low level boron doped La0.8Gd0.2Fe11.4Si1.6. Journal of Magnetism and Magnetic Materials, 331, 102-108. doi:10.1016/j.jmmm.2012.11.030en_AU
dc.identifier.govdoc5147en_AU
dc.identifier.issn0304-8853en_AU
dc.identifier.journaltitleJournal of Magnetism and Magnetic Materialsen_AU
dc.identifier.pagination102-108en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jmmm.2012.11.030en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4737en_AU
dc.identifier.volume331en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science BV.en_AU
dc.subjectSodiumen_AU
dc.subjectZincen_AU
dc.subjectCurie pointen_AU
dc.subjectBoronen_AU
dc.subjectLanthanumen_AU
dc.subjectIronen_AU
dc.titleEnhancement of the refrigerant capacity in low level boron doped La0.8Gd0.2Fe11.4Si1.6en_AU
dc.typeJournal Articleen_AU
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