Magnetic properties and magneto-caloric effect in pseudo-binary intermetallic (Ce,R)2Fe17 compounds (R = Y, Pr and Dy)

Álvarez, Pablo; Gorría, P.; Llamazares, J. L. Sánchez; Pérez, M.J.; Franco, V.; Reiffers, M.; Čurlík, I.; Gažo, E.; Kováč, J.; Blanco, J.A.

doi:10.1016/j.intermet.2011.02.020

Cited by 29 publications

(10 citation statements)

References 35 publications

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“…For Pr 10+x Fe 90−x alloy series, MCE was optimized in Pr 13 Fe 87 alloys with the Pr 2 Fe 17 phase as the single-crystalline phase detected (87). Pseudobinary Ce 2−x RE x Fe 17 compounds, with RE = Y (x = 1.2), Pr (x = 1.5), and Dy (x = 1.15), also crystallize in a Th 2 Zn 17 -type structure and have been studied with the aim of tuning SOPT temperature (253, 264, and 273 K for Y, Pr, and Dy compounds, respectively) (88). | S M | and RC values decreased in a Pr > Y > Dy order (5.3, 4.3, and 3.3 J kg −1 K −1 , respectively, for H = 5 T).…”

Section: 15mentioning

confidence: 99%

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

Franco

Blázquez

Ingale

et al. 2012

Annu. Rev. Mater. Res.

1,009

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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Section: 15mentioning

confidence: 99%

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

Franco

Blázquez

Ingale

et al. 2012

Annu. Rev. Mater. Res.

1,009

447

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“…Values of S M ∼ −6 J(kgK) −1 under a magnetic field variation of H = 50 kOe are found around room temperature, for R = Pr or Nd compounds 15,30,34 and pseudobinary alloys where two different R elements are mixed. 43,44 Since studies of the magnetocaloric response in R 2 Fe 17 are scarce, we have performed a thorough investigation into the heavy rare-earth Er, which is expected to show its larger MCE around room temperature.…”

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 order to estimate the Curie temperature of the sample, the magnetization vs. temperature, M(T), curve under a low applied magnetic field µ 0 H = 5 mT (not shown) has been measured. Thereafter, the value of T C has been taken as the minimum of the dM/dT vs. T curve, which is a commonly adopted criterion [13,24,29]. In this way, T C = 291 ± 5 K for YPrFe 17 , which is in between those reported values for Pr 2 Fe 17 (T C = 286 ± 2 K [13]), and for Y 2 Fe 17 (T C = 301 ± 4 K [15]).…”

Section: Resultsmentioning

confidence: 98%

“…Thereafter, the value of T C has been taken as the minimum of the dM/dT vs. T curve, which is a commonly adopted criterion [13,24,29]. In this way, T C = 291 ± 5 K for YPrFe 17 , which is in between those reported values for Pr 2 The isothermal magnetic entropy change, |∆S M | has been calculated from the set of isothermal magnetization vs. applied magnetic field, M(H), curves depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The crystal structure of the binary intermetallic R 2 Fe 17 compounds can be either of Th 2 Zn 17 -type (rhombohedral R3m space group) for light rare-earths, or Th 2 Ni 17 -type (hexagonal P 6 3 mmc space group) for heavy rare-earths [19,20]. In the case of R = Y, Gd and Tb or in pseudo-binary intermetallic R 2-x R' x Fe 17 alloys with a mixture of two different R atoms, both crystal structures can coexist, with the rare-earths sharing the crystallographic sites [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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