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

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

doi:10.1016/j.jallcom.2014.10.134

Cited by 21 publications

(19 citation statements)

References 18 publications

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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: 80%

“…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%

“…[57] Theoretical calculations were performed to explain the different behavior observed between rapid quenching and mechanically alloyed Co 62 Nb 6 Zr 2 B 30 amorphous samples. In order to do so, expression [14] was simplified to a summatory of discrete DS M (T,T C ) responses weighed using a Gaussian distribution of T C to describe the mechanically alloyed sample: [43] DS total M ðTÞ ¼ C…”

Section: Curie Temperature Distributionsmentioning

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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Section: Effect Of the Demagnetizing Fieldmentioning

confidence: 80%

Section: Effect Of the Demagnetizing Fieldmentioning

confidence: 99%

Section: Curie Temperature Distributionsmentioning

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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“…Consequently, there are no significant changes in between the -ΔSM (T) curves for the ball milled samplestheir differentiating factor is obvious in low applied fields. All the materials were measured in powder form with similar particle shape which allows us to neglect stray field effects since the demagnetization factor will be the same [51].…”

Section: Discussionmentioning

confidence: 99%

Influence of short time milling in R5(Si,Ge)4, R = Gd and Tb, magnetocaloric materials

et al. 2015

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The effect of the short milling times on R5(Si,Ge)4 R =Gd, Tb magnetocaloric material properties was investigated. In particular, the effect of milling on atomic structure, particles size and morphology, magnetic, and magnetocaloric effect was studied. With short milling times (< 2.5h), a reduction of the Gd5Si1.3Ge2.7 and Tb5Si2Ge2 particles size was achieved down to approximately 3.5 µm. For both compositions the main differences are a consequence of the milling effect on the coupling of the structural and magnetic transitions. In the Gd5Si1.3Ge2.7 case, a second-order phase transition emerges at high temperatures as a result of ball milling. Consequently, there is a decrease in the magnetocaloric effect of 35% after 150 minutes of milling. Interestingly, an opposite effect is observed in Tb5Si2Ge2 where a 23% increase of the magnetocaloric effect was achieved, driven by the enhancement of the coupling between magnetic and structural transitions arising from internal strain promoted by the milling process.

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“…Magnetocaloric effect (MCE) of different systems were analyzed considering a DTT: amorphous alloys [12,74], SOPT manganites [55,75], and other intermetallic phases [76]. It has been generally reported that the presence of a DTT leads to a decrease of the maximum of the magnetic entropy change, ∆S M .…”

Section: Effects Of Distribution Of Transition Temperaturesmentioning

confidence: 99%

Distribution of Transition Temperatures in Magnetic Transformations: Sources, Effects and Procedures to Extract Information from Experimental Data

Manchón-Gordón

López-Martín

Vidal-Crespo

et al. 2020

Metals

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The presence of a distribution of transition temperatures (DTT) is ubiquitous in materials science. It is common to ascribe deviations from theoretical pure-phase behavior to this fact. To adapt the different pure phase models to systems with a DTT, the parameters of such distribution must be known or at least estimated. In this review, the different sources for the existence of such distributions and their effects on magnetothermal properties are summarized. In addition, different models proposed to extract the parameters of the corresponding DTT are discussed and extended, starting from Weiss model, to account for other phenomenologies. Experimental results on amorphous Fe-Nb-B and intermetallic MnCo(Fe)Ge systems are also reported.

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

Cited by 21 publications

References 18 publications

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

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

Influence of short time milling in R5(Si,Ge)4, R = Gd and Tb, magnetocaloric materials

Distribution of Transition Temperatures in Magnetic Transformations: Sources, Effects and Procedures to Extract Information from Experimental Data

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