The magnetic properties and magnetocaloric effect in (Mn1-xNix)CoGe

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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.accessioned2022-08-29T05:24:38Zen_AU
dc.date.available2022-08-29T05:24:38Zen_AU
dc.date.issued2016-02-02en_AU
dc.date.statistics2021-09-24en_AU
dc.description.abstractMagnetic refrigeration based on magnetocaloric effect is considered as a potential alternative to the conventional gas-compression based refrigeration [1], because the former can improve energy efficiency and reduce emission of environment-harmful chemicals. Materials with firstorder magneto-structural transitions are of great interest for large magnetocaloric effect, e.g. Gd5(Si,Ge)4 and Heusler alloys [3]. Magneto-structural transition and large magnetocaloric effect were also observed in MnCoGe-based alloys. For MnCoGe-based alloys, there are two stable crystallographic structures: nominally low temperature TiNiSi-type orthorhombic structure (Pnma, martensitic phase) and the high temperature Ni2In-type hexagonal structure (P63/mmc, austenitic phase), with a martensitic transformation around TM ~650 K [4]. Both phase present as ferromagnetic state at low temperature with Curie temperature of ~345 K and ~275 K, for the martensitic and austenitic phases, respectively. When the martensitic transition temperature TM is moved into the temperature range of the two Curie temperatures, e.g. Fe doping (Mn1−xFex)CoGe [5], coupling of magnetic and lattice structures is obtained and hence present a magneto-structural transition from the ferromagnetic martensite to the paramagnetic austenite. In this work, Ni was used as substitute for Mn to drive the martensitic transformation temperature. The crystallographic structures and magnetic properties of annealed (Mn1-xNix)CoGe (x = 0.02, 0.03, 0.04, 0.05, 0.06 and 0.07) were studied via X-ray diffraction (T = 20-310 K) and magnetisation (T = 5-340 K) measurements. Then the magneto-structural transition were confirmed by neutron diffraction experiments (T = 5-320 K), and the influence of magnetic field on the magnetostructural transition were investigated using magnetic-field neutron diffraction (B = 0-9 T). The magnetic entropy changes have been derived in the conventional way from a series of isothermal magnetisation experiments, e.g. –Sm ~ 8.8 J kg−1 K−1 for a magnetic field change of B = 0-5 T in (Mn0.95Ni0.05)CoGe.en_AU
dc.identifier.citationRen, Q, Y., Hutchinson, W. D., Wang, J. L., Studer, A. J., & Campbell, S, J. (2016). The magnetic properties and magnetocaloric effect in Mn1-xNixCoGe. Paper presented to the 40th Annual Condensed Matter and Materials Meeting Charles Sturt University, Wagga Wagga, NSW, 2nd February – 5th February, 2016, (pp. 125-126). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2016/Wagga_2016_Conference_Handbook.pdfen_AU
dc.identifier.conferenceenddate5 February 2016en_AU
dc.identifier.conferencename40th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate2 February 2016en_AU
dc.identifier.isbn978-0-646-96433-1en_AU
dc.identifier.otherTP17en_AU
dc.identifier.pagination124-125en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2016/Wagga_2016_Conference_Handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13652en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectElementsen_AU
dc.subjectMetalsen_AU
dc.subjectPhysical propertiesen_AU
dc.subjectRefrigeratorsen_AU
dc.subjectThermodynamic propertiesen_AU
dc.subjectTransition element compoundsen_AU
dc.subjectCobalt compoundsen_AU
dc.subjectGermaniumen_AU
dc.subjectEntropyen_AU
dc.subjectMagneto-thermal effectsen_AU
dc.subjectMagnetic refrigeratorsen_AU
dc.titleThe magnetic properties and magnetocaloric effect in (Mn1-xNix)CoGeen_AU
dc.typeConference Posteren_AU
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