The isothermal variation of the entropy (ΔST) may be miscalculated from magnetization isotherms in some cases: MnAs and Gd5Ge2Si2 compounds as examples

Carvalho, A. Magnus G.; Coelho, A. A.; Ranke, P.J. von; Alves, C.S.

doi:10.1016/j.jallcom.2010.12.088

Cited by 75 publications

(23 citation statements)

References 25 publications

(51 reference statements)

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“…The

M_{B}

(T) curves have been used (instead of the isothermal magnetization

M_{T}

(B) curves) to calculate the isothermal magnetic entropy change (

boldΔ S_{m}

) because the application of the Maxwell equation on the

M_{B}

(T) curves is expected to prevent the so-called “spike” caused by a phase co-existence [31,32]. The isofield

M_{B}

(T) curves are first measured in the field upon cooling and then upon heating with a rate of 2 Kmin

^{- 1}

.…”

Section: Resultsmentioning

confidence: 99%

Tuneable Giant Magnetocaloric Effect in (Mn,Fe)2(P,Si) Materials by Co-B and Ni-B Co-Doping

2016

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Abstract:The influence of Co (Ni) and B co-doping on the structural, magnetic and magnetocaloric properties of (Mn,Fe) 2 (P,Si) compounds is investigated by X-ray diffraction (XRD), differential scanning calorimetry, magnetic and direct temperature change measurements. It is found that Co (Ni) and B co-doping is an effective approach to tune both the Curie temperature and the thermal hysteresis of (Mn,Fe) 2 (P,Si) materials without losing either the giant magnetocaloric effect or the positive effect of the B substitution on the mechanical stability. An increase in B concentration leads to a rapid decrease in thermal hysteresis, while an increase in the Co or Ni concentration hardly changes the thermal hysteresis of the (Mn,Fe) 2 (P,Si) compounds. However, the Curie temperature decreases slowly as a function of the Co or Ni content, while it increases dramatically for increasing B concentration. Hence, the co-substitution of Fe and P by Co (Ni) and B, respectively, offers a new control parameter to adjust the Curie temperature and reduce the thermal hysteresis of the (Mn,Fe) 2 (P,Si) materials.

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“…The

M_{B}

(T) curves have been used (instead of the isothermal magnetization

M_{T}

(B) curves) to calculate the isothermal magnetic entropy change (

boldΔ S_{m}

) because the application of the Maxwell equation on the

M_{B}

(T) curves is expected to prevent the so-called “spike” caused by a phase co-existence [31,32]. The isofield

M_{B}

(T) curves are first measured in the field upon cooling and then upon heating with a rate of 2 Kmin

^{- 1}

.…”

Section: Resultsmentioning

confidence: 99%

Tuneable Giant Magnetocaloric Effect in (Mn,Fe)2(P,Si) Materials by Co-B and Ni-B Co-Doping

2016

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“…This is because the state of the system will vary on the basis of the manner in which the final values of temperature and field are reached, due to the fact that the mixture of phases will be different (40). Alternative measurement paths have been proposed to avoid this phase coexistence and allow for use of Equation 2 to properly calculate S M (39)(40)(41). Reference 10 comprehensively studies the different artifacts that can appear when different measuring protocols are used.…”

Section: Indirect Measurementsmentioning

confidence: 99%

The Magnetocaloric Effect and Magnetic Refrigeration Near Room Temperature: Materials and Models

Franco

Blázquez

Ingale

et al. 2012

Annu. Rev. Mater. Res.

1,003

447

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In the past 20 years, there has been a surge in research on the magnetocaloric response of materials, due mainly to the possibility of applying this effect for magnetic refrigeration close to room temperature. This review is devoted to the main families of materials suitable for this application and to the procedures proposed to predict their response. Apart from the possible technological applications, we also discuss the use of magnetocaloric characterization to gain fundamental insight into the nature of the underlying phase transition.

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“…With Eq. (4), the RC value for our alloy was calculated and it is compared to the values for the most studied magnetocaloric materials, [5][6][7]26,28,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] as shown in Fig. 4(a).…”

mentioning

confidence: 99%

Giant magnetic refrigeration capacity near room temperature in Ni40Co10Mn40Sn10 multifunctional alloy

Huang

Cong

Suo

et al. 2014

Applied Physics Letters

137

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We report a giant effective magnetic refrigeration capacity in a Ni40Co10Mn40Sn10 multifunctional alloy. With a large magnetization difference between austenite and martensite, this alloy shows a strong magnetic field dependence of transformation temperatures. Complete magnetic-field-induced structural transformation and a considerable magnetic entropy change are observed in a broad operating temperature window of 33 K near room temperature. Consequently, an effective magnetic refrigeration capacity of 251 J/kg for 5 T is achieved, which is the largest value for Ni-Mn-based Heusler alloys and comparable to that of the high-performance Gd-Si-Ge and La-Fe-Si magnetocaloric materials. Incorporating the advantages of low cost and non-toxicity, this alloy shows very promising prospects for room-temperature magnetic refrigeration.

show abstract

The isothermal variation of the entropy (ΔST) may be miscalculated from magnetization isotherms in some cases: MnAs and Gd5Ge2Si2 compounds as examples

Cited by 75 publications

References 25 publications

Tuneable Giant Magnetocaloric Effect in (Mn,Fe)2(P,Si) Materials by Co-B and Ni-B Co-Doping

Tuneable Giant Magnetocaloric Effect in (Mn,Fe)2(P,Si) Materials by Co-B and Ni-B Co-Doping

The Magnetocaloric Effect and Magnetic Refrigeration Near Room Temperature: Materials and Models

Giant magnetic refrigeration capacity near room temperature in Ni40Co10Mn40Sn10 multifunctional alloy

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