About: Inapplicability of the Maxwell relation for the quantification of caloric effects in anisotropic ferroic materials

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About: Inapplicability of the Maxwell relation for the quantification of caloric effects in anisotropic ferroic materials Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Giant caloric effects were reported in elasto-, electro- and magnetocaloric materials near phase transformations. Commonly, their entropy change is indirectly evaluated by a Maxwell relation. Additionally to the well-known spurious “colossal results near first-order phase transitions and limitations in the presence of magnetic domains, we report the fundamental failure of this approach for materials that show structural reorientations in external fields. We analyze exemplarily the magnetic shape memory alloy Ni-Mn-Ga. Application of a magnetic field causes magnetically induced reorientation of the crystal structure in the martensite phase. This results in a spurious inverse magnetocaloric effect that disappears when the measurement procedure is repeated. This failure is universal as the vector character of the applied field is not considered in the common scalar evaluation of a Maxwell relation. Giant caloric effects were reported in elasto-, electro- and magnetocaloric materials near phase transformations. Commonly, their entropy change is indirectly evaluated by a Maxwell relation. Additionally to the well-known spurious “colossal results near first-order phase transitions and limitations in the presence of magnetic domains, we report the fundamental failure of this approach for materials that show structural reorientations in external fields. We analyze exemplarily the magnetic shape memory alloy Ni-Mn-Ga. Application of a magnetic field causes magnetically induced reorientation of the crystal structure in the martensite phase. This results in a spurious inverse magnetocaloric effect that disappears when the measurement procedure is repeated. This failure is universal as the vector character of the applied field is not considered in the common scalar evaluation of a Maxwell relation. (en)
Title	Inapplicability of the Maxwell relation for the quantification of caloric effects in anisotropic ferroic materials Inapplicability of the Maxwell relation for the quantification of caloric effects in anisotropic ferroic materials (en)
skos:prefLabel	Inapplicability of the Maxwell relation for the quantification of caloric effects in anisotropic ferroic materials Inapplicability of the Maxwell relation for the quantification of caloric effects in anisotropic ferroic materials (en)
skos:notation	RIV/68378271:_____/14:00431310!RIV15-GA0-68378271
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP107/11/0391)
http://linked.open...iv/cisloPeriodika	SI
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Heczko, Oleg
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	21103
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/14:00431310
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	magnetocaloric; shape memory alloys; multiferroic; Ni-Mn-Ga; Maxwell relation (en)
http://linked.open.../riv/klicoveSlovo	magnetocaloric multiferroic shape memory alloys Ni-Mn-Ga Maxwell relation
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[5356B4F537E1]
http://linked.open...i/riv/nazevZdroje	International Journal of Refrigeration
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Heusler alloys exhibiting magnetic shape memory effect and related phenomena
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	37
http://linked.open...iv/tvurceVysledku	Fähler, S. Heczko, Oleg Niemann, R. Schultz, L.
http://linked.open...ain/vavai/riv/wos	000330814400035
issn	0140-7007
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.ijrefrig.2013.07.029

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