COP of cooling cycles around the AF–F transition in FeRh based on experimental data

Annaorazov, M.P.; Güven, H.M.; Bärner, K.

doi:10.1016/j.jallcom.2005.01.016

Cited by 21 publications

(13 citation statements)

References 40 publications

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“…Mn 2−x Cr x Sb undergoes itinerant metamagnetic ferrimagnetic (Fr) to antiferromagnetic (AF) transition on cooling accompanied by significant change of the unit cell volume, electrical resistance, local Mn magnetic moment [5][6][7][8][9][10][11][12][13]. Thus, in this contribution we depict first data on Mn 2−x Cr x Sb, which has been considered to be a candidate for magnetocaloric cooling [3,14], in particular as some samples show only a very small thermal hysteresis together with reasonable entropy steps, …”

Section: Introductionmentioning

confidence: 93%

“…Interestingly, besides the quasistatic response that one derives from differentiating the ρ (T, p)-curves, in these AC γ-results contributions were discovered which subsequently were attributed to a percolation of certain phase regions [1]. Obviously, one wants to expand the γ-method to just any other compound, in particular to those metallic compounds which show a first order magnetic phase transition, which would lend itself to baro-or magnetocaloric cooling cycles around the transition temperature T S [2][3][4]. In that case, the first appearance of the other phase might be important for the design of a baroor magnetocaloric cycle.…”

Section: Introductionmentioning

confidence: 99%

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The baric coefficient of resistance of Mn1.9Cr0.1Sb as measured by the double AC method

Morchshakov

Медведева

Boshta

et al. 2008

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

The baric coefficient of resistance of Mn1.9Cr0.1Sb as measured by the double AC method

Morchshakov

Медведева

Boshta

et al. 2008

Journal of Alloys and Compounds

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“…Conventional nearly equiatomic stoichiometric Fe-Rh alloys exhibit a giant magnetocaloric effect (MCE) but have some limitations for widespread use in magnetic refrigeration technology. Among these are the sharp ferromagnetic/antiferromagnetic transition, the relatively high transition temperature and, of course, the high cost of Rh as a constituent of the working body of a refrigerator [1][2][3][4]. The obvious idea is to dope the pure alloy having CsCl-type structure with some elements so that the crucial parameters are adjusted to more suitable values.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of the magnetocaloric effect in FeRh-based alloys in the vicinity of the first order magnetic phase transition

et al. 2018

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Medical applications of magnetocaloric effect (MCE) require possibility for precision shift of a temperature of the magnetic phase transition at the same MCE value and minimize irreversibility. Thus, detail dynamic MCE investigation of such alloys with non-toxic biocompatible dopants need to be done. In present work, the giant magnetocaloric effect, which is observed in the whole family of Fe-Rh alloys, has been investigated in Pd-doped samples in slowly cycled magnetic fields of up to 1.8 T in magnitude for a range of temperatures, 250 K < T < 350 K. The shift of the ferromagnetic/antiferromagnetic transition temperature down towards room temperature and the decrease in the MCE have been observed in these alloys in comparison with a quasi-equiatomic FeRh alloy. The measurements have also shown an asymmetric behaviour of the first order magnetic phase transition with respect to whether the transition is traversed by heating from lower temperatures or cooling from above. These peculiarities have been explained in the framework of the ab-initio density functional theory-based disordered local moment theory of the MCE. The results have been compared with the those for the non-doped FeRh alloy. Thus features of the first order magnetic phase transition that these alloys have in common have been revealed which enable some predictions to be made appropriate for practical applications.

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“…The reverse transition takes place at lower temperature. The width of thermal hysteresis can be varied by the changing of alloy's chemical content, preparation technique of the samples, heat-and mechanical treatment in wide range of temperatures [1,2]. To decrease the hysteresis it is important for technical applications.…”

Section: Introductionmentioning

confidence: 99%

“…2. Experimental details, samples preparation, and selection of sample form FeRh alloys were prepared by induction melting in argon atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Phase Transitions in Fe-Rh Alloys Induced by Temperature

2015

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This research work was aimed to nd the composition of equiatomic FeRh alloy and to nd the way of preparation of samples with extremely narrow thermal hysteresis and repeatable results. Alloys with content of Fe from 48 up to 52 at.% were examined. FeRh alloys were prepared in forms of bulk piece, plate and wire. The plates of alloys were found to be more perspective for further investigations. The inuence of parameters of ingot and samples treatments on antiferromagnetic-ferromagnetic transition was studied. The ways of narrowing of temperature hysteresis were established.

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COP of cooling cycles around the AF–F transition in FeRh based on experimental data

Cited by 21 publications

References 40 publications

The baric coefficient of resistance of Mn1.9Cr0.1Sb as measured by the double AC method

The baric coefficient of resistance of Mn1.9Cr0.1Sb as measured by the double AC method

Peculiarities of the magnetocaloric effect in FeRh-based alloys in the vicinity of the first order magnetic phase transition

Phase Transitions in Fe-Rh Alloys Induced by Temperature

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