The magnetic properties and magnetocaloric effect in Mn1-xNixCoGe

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dc.contributor.authorRen, QYen_AU
dc.contributor.authorHutchison, WDen_AU
dc.contributor.authorWang, JLen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorCampbell, SJen_AU
dc.date.accessioned2021-08-13T03:40:22Zen_AU
dc.date.available2021-08-13T03:40:22Zen_AU
dc.date.issued2015-02-03en_AU
dc.date.statistics2021-08-12en_AU
dc.description.abstractMnCoGe-based compounds reveal promise for magnetic refrigeration and as such have been extensively investigated over the last decade [1]. Refrigeration based on magnetic cooling via the magnetocaloric effect offers potential as an alternative to conventional gas-compression systems. MoCoGe-based compounds have two crystallographic structures: nominally low temperature TiNiSi-type orthorhombic structure (Pnma) and the high temperature Ni2In-type hexagonal structure (P63/mmc). When the structural transition temperature between these two structures is ‘tuned’ between the respective Curie temperatures of the phases (~345 K for the orthorhombic phase and ~275 K for the hexagonal phase [1]), a magneto-structural transition can be obtained. Such a transition allows a direct change from the ferromagnetic orthorhombic phase to the paramagnetic hexagonal phase [1]. For a magneto-structural transition, the lattice and magnetic entropy changes occur simultaneously, thereby providing scope for observation of a large magnetocaloric effect [2]. The crystallographic structures and magnetic properties of annealed Mn1-xNixCoGe (x = 0.02, 0.03, 0.04, 0.05, 0.06 and 0.07) have been investigated using variable temperature X-ray diffraction and neutron diffraction (T = 5 - 320 K) with neutron diffraction measurements carried out both with and without applied magnetic fields for Mn0.95Ni0.05CoGe (B = 0 - 8 T). Such experiments allow separation of the structural and magnetic contributions to the total entropy change at a magneto-structural transition [3]. The magnetic entropy changes have been derived in the conventional way from a series of isothermal magnetisation experiments, e.g. –ΔSm ~8.8 J kg-1 K-1 for a magnetic field change of ΔB = 0 - 5 T in Mn0.95Ni0.05CoGe.en_AU
dc.identifier.citationRen, Q, Y., Hutchinson, W. D., Wang, J. L., Studer, A. J., & Campbell, S, J. (2015). The magnetic properties and magnetocaloric effect in Mn1-xNixCoGe. Paper presented at the 39th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 3 February 2015 - 6 February 2015, (pp. 83). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2015/Wagga2015_10_Handbook.pdfen_AU
dc.identifier.conferenceenddate6 February 2015en_AU
dc.identifier.conferencename39th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate3 February 2015en_AU
dc.identifier.isbn978-0-646-96433-1en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2015/Wagga2015_10_Handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11350en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectCobalt compoundsen_AU
dc.subjectCrystal structureen_AU
dc.subjectEntropyen_AU
dc.subjectGermaniumen_AU
dc.subjectMagnetic refrigeratorsen_AU
dc.subjectMagneto-thermal effectsen_AU
dc.subjectManganese compoundsen_AU
dc.subjectNickel compoundsen_AU
dc.subjectThermodynamic propertiesen_AU
dc.titleThe magnetic properties and magnetocaloric effect in Mn1-xNixCoGeen_AU
dc.typeConference Abstracten_AU
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