Magnetocaloric effect in melt-spun FePd ribbon alloy with second order phase transition

Prida, V.M.; Franco, V.; Vega, V.; Sánchez-Llamazares, J. L.; Suñol, J.J.; Conde, A.; Hernando, B.

doi:10.1016/j.jallcom.2010.09.060

Cited by 27 publications

(7 citation statements)

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“…The estimated critical exponents for La0.8Ca0.2Mn0.9Co0.1O3 indicate that the ferromagnetic transition belongs to a new universality class. The value of n obtained for x = 0.2 is in the vicinity of the value n = 0.75, being close to that obtained for the soft magnetic amorphous alloys [53,54].…”

Section: Discussionsupporting

confidence: 85%

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Critical Behavior of La0.8Ca0.2Mn1−xCoxO3 Perovskite (0.1 ≤ x ≤ 0.3)

et al. 2017

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Abstract:The critical properties of La 0.8 Ca 0.2 Mn 1−x Co x O 3 (x = 0, 0.1, 0.2 and 0.3) compounds were investigated by analysis of the magnetic measurements in the vicinity of their critical temperature. Arrott plots revealed that the paramagnetic PM-ferromagnetic (FM) phase transition for the sample with x = 0 is a first order transition, while it is a second order transition for all doped compounds. The critical exponents β, γ and δ were evaluated using modified Arrott plots (MAP) and the Kouvel-Fisher method (KF). The reliability of the evaluated critical exponents was confirmed by the Widom scaling relation and the universal scaling hypothesis. The values of the critical exponents for the doped compounds were consistent with the 3D-Heisenberg model for magnetic interactions. For x = 0.1, the estimated critical components are found inconsistent with any known universality class. In addition, the local exponent n was determined from the magnetic entropy change and found to be sensitive to the magnetic field in the entire studied temperature range.

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Section: Discussionsupporting

confidence: 85%

“…From Figure 10, it can be clearly seen that n evolves with the field in the entire studied temperature range and exhibits minimum values around their peak temperatures [51,52]. The value of n obtained for x = 0.2 is in the vicinity of the value n = 0.75, being close to that obtained for the soft magnetic amorphous alloys [53,54].…”

Section: Resultssupporting

confidence: 75%

Critical Behavior of La0.8Ca0.2Mn1−xCoxO3 Perovskite (0.1 ≤ x ≤ 0.3)

et al. 2017

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“…The small deviation of the exponent from the mean-field value in the melt-spun GdAl 2 suggests the role of disorder in the nanostructured sample. Such deviations have been observed earlier in the melt-spun FePd alloy and some rare earth based bulk metallic glasses [14,15].…”

Section: Resultssupporting

confidence: 77%

Magnetism and magnetocaloric effect of melt-spun, nanostructured GdAl₂

Prusty

Chelvane

Nirmala

2020

Mater. Res. Express

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Magnetocaloric effect (MCE) of melt-spun rare earth intermetallic compound GdAl 2 (Cubic, MgCu 2 -type) has been studied. The sample becomes nanostructured upon melt-spinning and the crystallite size obtained from the powder x-ray diffraction data is about 48 nm. A sluggish paramagnetic to ferromagnetic transition occurs at a Curie temperature (T C ) of about 136 K. This value is about 30 K lower than the ferromagnetic transition temperature of the arc-melted GdAl 2 . The maximum isothermal magnetic entropy change (ΔS m ) is found to be∼−8.3 Jkg −1 K −1 at 133 K for 70 kOe field change around T C . This value is quite comparable to that of bulk sample prepared by arcmelting which is about −8.5 Jkg −1 K −1 at 168 K for the same field change. Thus melt-spinning process results in broadening of the peak in the isothermal magnetic entropy change versus temperature plot without compromising on the magnetocaloric effect.

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“…The refrigeration capacity (RC) which approximately quantifies the total heat transferred between the hot and cold reservoirs over the active temperature range [22] was calculated from the product of S pk M with the full width at half maximum (FWHM) of the entropy curve for x = 0.2, 0.5, 0.7 and 1.0. The calculated RC values are plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%