On the broadening of the magnetic entropy change due to Curie temperature distribution

Álvarez-Alonso, Pablo; Llamazares, J. L. Sánchez; Sánchez-Valdés, C.F.; Cuello, G.J.; Franco, V.; Gorría, P.; Blanco, J.A.

doi:10.1063/1.4867346

Cited by 29 publications

(16 citation statements)

References 17 publications

(19 reference statements)

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“…Our δ T FWHM values are higher than those of Gd (~35 K)49, Pr 2 Fe 17 (~78 K)36, Nd 2 Fe 17 (~95 K)36, (Fe 70 Ni 30 ) 89 Zr 7 B 4 (133 K)18 at an applied magnetic field of 1 T. Single and multiphase alloys of (Fe 70 Ni 30 ) 89 B 11 have δ T FWHM value of 174 K and 322 K, respectively13. Our high working temperature span results in high RCP, which quantifies the magnitude of the heat extracted in a thermodynamic cycle.…”

Section: Resultscontrasting

confidence: 64%

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Magnetocaloric Properties of Fe-Ni-Cr Nanoparticles for Active Cooling

Chaudhary

Ramanujan

2016

Sci Rep

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Low cost, earth abundant, rare earth free magnetocaloric nanoparticles have attracted an enormous amount of attention for green, energy efficient, active near room temperature thermal management. Hence, we investigated the magnetocaloric properties of transition metal based (Fe70Ni30)100−xCrx (x = 1, 3, 5, 6 and 7) nanoparticles. The influence of Cr additions on the Curie temperature (TC) was studied. Only 5% of Cr can reduce the TC from ~438 K to 258 K. These alloys exhibit broad entropy v/s temperature curves, which is useful to enhance relative cooling power (RCP). For a field change of 5 T, the RCP for (Fe70Ni30)99Cr1 nanoparticles was found to be 548 J-kg−1. Tunable TCin broad range, good RCP, low cost, high corrosion resistance and earth abundance make these nanoparticles suitable for low-grade waste heat recovery as well as near room temperature active cooling applications.

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Section: Resultscontrasting

confidence: 64%

“…The magnetocaloric effect in nanostructured materials has received considerable interest recently since they possess additional advantages513283132363738. These nanomaterials can be useful for active magnetic cooling devices, microfluidic reactors and other systems.…”

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confidence: 99%

Magnetocaloric Properties of Fe-Ni-Cr Nanoparticles for Active Cooling

Chaudhary

Ramanujan

2016

Sci Rep

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“…Moreover, concerning microstructure there is a higher content of inhomogeneities and structural defects in the amorphous alloys produced by MA when compared to those produced by RQ. This can lead to a broader Curie temperature distribution in the former case [12]. In this work, the effects of the demagnetizing factor and a Curie temperature distribution on a cobalt-based amorphous alloy obtained by mechanical alloying have been studied, making a comparative study with the same alloy composition produced by rapid quenching.…”

Section: Introductionmentioning

confidence: 99%

Analysis of magnetocaloric effect of ball milled amorphous alloys: Demagnetizing factor and Curie temperature distribution

Moreno-Ramírez

Ipus

Franco

et al. 2015

Journal of Alloys and Compounds

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“…Among RE-based materials Gd 5 Si 2 Ge 2 , [13,14] La(FeSi) 13 , [15][16][17][18] RE 2 Fe 17 intermetallics, [19,20] clathrates Eu 8 Ga 16 Ge 30 , [21] and amorphous alloys [13,14,22] can be found. Among TM-based systems Heusler alloys, [23][24][25] MnAs, [26][27][28][29] cFeNi, [30][31][32] and amorphous alloys [33][34][35][36][37] can be found.…”

Section: Results On Mce Of Ball-milled Samplesmentioning

confidence: 99%

Analysis of the Magnetocaloric Effect in Powder Samples Obtained by Ball Milling

Blázquez

Ipus

Moreno-Ramírez

et al. 2015

Metallurgical and Materials Transactions E

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Since the discovery of the giant magnetocaloric effect (MCE) close to room temperature in FeRh and particularly in Gd 5 Si 2 Ge 2 compounds, the study of this phenomenon has experienced an exponential growth. Among the different techniques used to produce magnetocaloric materials, ball milling has been shown as a very versatile one and presents several advantages over other preparation techniques (e.g., easy scale-up to industrial production). Although a general decrease of the peak value of the magnetic entropy change is observed for milled samples, it can be compensated by the large broadening of the MCE peak, leading to an increase of the refrigeration capacity. In this short review, several aspects inherent to powder samples affecting MCE will be discussed, such as the relevant effect of the demagnetizing field, the possible multiphase character, and the presence of Curie temperature distributions. In mechanically alloyed samples, the two latter factors are typically affected by the degree of integration of the different starting constituents.

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On the broadening of the magnetic entropy change due to Curie temperature distribution

Cited by 29 publications

References 17 publications

Magnetocaloric Properties of Fe-Ni-Cr Nanoparticles for Active Cooling

Magnetocaloric Properties of Fe-Ni-Cr Nanoparticles for Active Cooling

Analysis of magnetocaloric effect of ball milled amorphous alloys: Demagnetizing factor and Curie temperature distribution

Analysis of the Magnetocaloric Effect in Powder Samples Obtained by Ball Milling

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