The effect of ball milling in the microstructure and magnetic properties of Pr2Fe17 compound

Llamazares, J.L. Sánchez; Pérez, M.J.; Álvarez, Pablo; Santos, Joana; Sánchez, Marı́a Luisa Fernández; Hernando, B.; Blanco, J.A.; Marcos, Jorge Sánchez; Gorría, P.

doi:10.1016/j.jallcom.2008.07.210

Cited by 13 publications

(8 citation statements)

References 12 publications

(12 reference statements)

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“…6a)). Note that there is a small shift of temperature at which the peak of the MCE occurs and that this peak tends to stabilize at 175 K. In summary, the milling process leads to a reduction of the maximum magnetic entropy change in agreement with previously reported data [44]. KOe, close to the value reported by Morellon and co-authors [47].…”

Section: Magnetic Entropysupporting

confidence: 91%

“…2, showing that BM time acts on both materials in a similar way, shrinking them. In the literature, these changes, are usually associated with structural disorder (vacancies, dislocations and grain boundaries) promoted by the milling process [31,37,44]. But in the present case it is clear that the peak shifts are related to strain effect induced by the BM [44].…”

Section: A Structural Characterizationmentioning

confidence: 63%

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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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Section: Magnetic Entropysupporting

confidence: 91%

Section: A Structural Characterizationmentioning

confidence: 63%

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

et al. 2015

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“…In the latter, case, the structure can be a disordered variant in which the R atoms also occupy the 2c sites and the iron atoms occupy the 4e sites. 25,[37][38][39][40][41][42] In addition, for R 2 Fe 17 alloys, the rare-earth magnetic anisotropy is rather weak and the contributions of the rare-earth atoms are not sufficiently strong to counteract the iron sublattice anisotropy at room temperature, which favors an easy plane magnetization. Recently, the body of experimental data on R 2 Fe 17 has been enriched with results from a moderate MCE.…”

Section: Introductionmentioning

confidence: 99%

Magnetovolume and magnetocaloric effects in Er2Fe17

et al. 2012

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Combining different experimental techniques, investigations in hexagonal P 6 3 /mmc Er 2 Fe 17 show remarkable magnetovolume anomalies below the Curie temperature, T C . The spontaneous magnetostriction reaches 1.6 × 10 −2 at 5 K and falls to zero well above T C , owing to short-range magnetic correlations. Moreover, Er 2 Fe 17 exhibits direct and inverse magnetocaloric effects (MCE) with moderate isothermal magnetic entropy S M , and adiabatic temperature T ad changes [ S M ∼ −4.7 J(kgK) −1 and T ad ∼ 2.5 K near the T C , and S M ∼ 1.3 J(kgK)and T ad ∼ −0.6 K at 40 K for H = 80 kOe, respectively, determined from magnetization measurements].The existence of an inverse MCE seems to be related to a crystalline electric field-level crossover in the Er sublattice and the ferrimagnetic arrangement between the magnetic moments of the Er and Fe sublattice. The main trends found experimentally for the temperature dependence of S M and T ad as well as for the atomic magnetic moments are qualitatively well described considering a mean-field Hamiltonian that incorporates both crystalline electric field and exchange interactions. S M (T ) and T ad (T ) curves are essentially zero at ∼150 K, the temperature where the transition from direct to inverse MCE occurs. A possible interplay between the MCE and the magnetovolume anomalies is also discussed.

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“…In later years, some materials have large magnetocaloric effect (so-called giant magnetocaloric effect -GMCE) were discovered, such as: rare earthcontaining alloys, As-containing alloys, La-containing alloys, Heusler alloys, Fe and Mn based rapidly quenched alloys, the ferromagnetic perovskite maganites… [1][2][3][4][5][6][7][8]. Among them, alloys containing rare earth elements (RE) such as Gd, Pr, Nd… are considered as very attractive systems [9][10][11][12][13][14][15]. In particular, Fe-rich RE 2 Fe 17 alloys exhibit ferromagnetic order with high values for the Fe magnetic moment, and the Curie temperature, T C , around room temperature in the case of Pr and Nd [16,17].…”

Section: Introductionmentioning

confidence: 99%

Phase formation and magnetocaloric effect in (Pr,Nd)-Fe alloys prepared by rapidly quenched method

Nguyen

Nguyen³

et al. 2018

EPJ Web Conf.

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In this work, Pr2-xNdxFe17 (x = 0 - 2) ribbons with thickness of about 15 μm were prepared by melt-spinning method. The alloy ribbons were then annealed at different temperatures (900 - 1100°C) for various time (0.25 - 2 h). The formation of the (Pr,Nd)2Fe17 (2:17) crystalline phase in the alloys strongly depends on the Pr/Nd ratio and annealing conditions. Annealing time for the completed formation of the 2:17 phase in the rapidly quenched ribbons is greatly reduced in comparison with that of bulk alloys. Curie temperature, TC, of the alloys can be controlled in room temperature region by changing Pr/Nd ratio. Maximum magnetic entropy change (|ΔSm|max) and full width at haft the maximum peak (FWHM) of the magnetic entropy change of the alloys were respectively found to be larger than 1.5 J.kg−1K−1 and 40 K in room temperature region with magetic field change ΔH = 12 kOe.

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The effect of ball milling in the microstructure and magnetic properties of Pr2Fe17 compound

Cited by 13 publications

References 12 publications

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

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

Magnetovolume and magnetocaloric effects in Er2Fe17

Phase formation and magnetocaloric effect in (Pr,Nd)-Fe alloys prepared by rapidly quenched method

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