Magnetostructural phase transitions and magnetocaloric effect in Tb-Dy-Ho-Co-Al alloys with a Laves phase structureстатья
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Дата последнего поиска статьи во внешних источниках: 6 февраля 2017 г.
Авторы:Tereshina I.S.,
Chzhan V.B.,
Tereshina E.A.,
Khmelevskyi S.,
Burkhanov G.S.,
Ilyushin A.S.,
Paukov M.A.,
Havela L.,
Karpenkov A.Yu,
Cwik J.,
Koshkid’ko Yu S.,
Miller M.,
Nenkov K.,
Schultz L.
Аннотация:The influence of simultaneous substitution within the rare earth (R) and Co sublattices on the structural, magnetic and magnetocaloric properties of the Laves phase RCo2-type compounds is studied. Main attention is devoted to the studies of the magnetostructural phase transitions and the transition types with respect to the alloy composition. Multicomponent alloys Tbx(Dy0.5Ho0.5)1-xCo2 and Tbx(Dy0.5Ho0.5)1-x(Co1.75Al0.25)2 were prepared with the use of high purity metals. Majority of the Tbx(Dy0.5Ho0.5)1-xCo2 alloys exhibit magnetic transitions of the first-order type and a large magnetocaloric effect. The substitution of Al for Co in Tbx(Dy0.5Ho0.5)1-xCo2 increases the Curie temperature but changes the transition type from first-to the second-order. The discussion of the physical mechanisms behind the observed phenomena is given on the basis of the first principles electronic-structure calculations taking into account both the atomic disorder and the magnetic disorder effects at finite temperatures. The advantage of Al-containing materials is that sufficiently high MCE values are preserved at T > TC.