A procedure to extract the magnetocaloric parameters of the single phases from experimental data of a multiphase system

Ipus, J.J.; Moreno-Ramírez, Luis M.; Blázquez, J.S.; Franco, V.; Conde, A.

doi:10.1063/1.4900790

Cited by 8 publications

(10 citation statements)

References 39 publications

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“…If the phase 2 experiences a SOPT, n 2 should be field independent while n 1 ¼ 1. This range has been explored for mechanically alloyed amorphous FeNbB alloys, where the presence of remaining a-Fe crystallites yields the behavior of the exponent n of the system to deviate from the field independency predicted for single phase materials [22].…”

Section: Resultsmentioning

confidence: 98%

Effect of α-Fe impurities on the field dependence of magnetocaloric response in LaFe11.5Si1.5

Blázquez

Moreno-Ramírez

Ipus

et al. 2015

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 98%

Effect of α-Fe impurities on the field dependence of magnetocaloric response in LaFe11.5Si1.5

Blázquez

Moreno-Ramírez

Ipus

et al. 2015

Journal of Alloys and Compounds

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“…The largest effect of N D is at the Curie temperature but it remains below~5 pct. [37,41,43] This allows us to conclude that neglecting demagnetizing field effects simply leads to a slight underestimation of the MCE. However, there is an important effect in the field dependence of the magnetic entropy change when demagnetizing field is not taken into account.…”

Section: Effect Of the Demagnetizing Fieldmentioning

confidence: 93%

“…[41] Figure 5 shows the linear relation predicted by Eq. [10] and Figure 6 was built using the slopes obtained at different fields.…”

Section: Effect Of Impuritiesmentioning

confidence: 96%

“…Despite the importance of demagnetizing field for the correct characterization of the samples, the applied field is seldom corrected to the internal field. [37][38][39][40][41][42][43][44] This correction can be done using N D = 1/3 for loosely spherical powder samples or for spherical powder in a spherical pack, which is derived from the expression: [45] …”

Section: Effect Of the Demagnetizing Fieldmentioning

confidence: 99%

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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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“…FeZrBCu, FeBCrGd, FeCoCrZrB alloys have been studied to understand how mechanical alloying affects MCE behaviour of the system. 2,13 Certain approaches exist to study the effect of annealing temperature on the magnetocaloric properties of the amorphous ribbons. 3,[14][15][16] In this paper it will be shown that the partial crystallisation plays a vital role in determining the ∆S M and RCP values of the amorphous alloy with composition Fe 40 Ni 38 Mo 4 B 18 .…”

Section: -2mentioning

confidence: 99%

Magnetocaloric effect in amorphous and partially crystallized Fe40Ni38Mo4B18 alloys

2016

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A study of magnetocaloric effect in amorphous and partially crystallized Fe40Ni38Mo4B18 alloys is reported. Amorphous Fe40Ni38Mo4B18, near its magnetic ordering temperature (600K) showed a magnetic entropy change ΔSM of 1.1 J/KgK and a relative cooling power of 36J/Kg in a field change of 10 kOe. Amorphous samples were partially crystallized by annealing at 700 K at different time intervals. Partially crystallized samples showed two distinct magnetic ordering temperature, one corresponding to the precipitated FeNi nanocrystals and the other one corresponding to the boron rich amorphous matrix. Magnetic ordering temperature of the residual amorphous matrix got shifted to the lower temperatures on increasing the annealing duration. Partially crystallised samples showed a magnetic entropy change of about 0.27J/kgK near the magnetic ordering temperature of the amorphous matrix (540K) in a field change of 10 kOe. The decrease in ΔSM on partial crystallisation is attributed to the biphasic magnetic nature of the sample.

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A procedure to extract the magnetocaloric parameters of the single phases from experimental data of a multiphase system

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Cited by 8 publications

References 39 publications

Effect of α-Fe impurities on the field dependence of magnetocaloric response in LaFe11.5Si1.5

Effect of α-Fe impurities on the field dependence of magnetocaloric response in LaFe11.5Si1.5

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

Magnetocaloric effect in amorphous and partially crystallized Fe40Ni38Mo4B18 alloys

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