Structural, magnetic and magnetocaloric properties in perovskite RE2FeCoO6 (RE = Er and Gd) compounds

Dong, Zhongqi; Yin, Suhua

doi:10.1016/j.ceramint.2019.09.077

Cited by 38 publications

(6 citation statements)

References 37 publications

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“…The lack of strong divergence of the magnetic correlation at T N may suggest competition of magnetic interactions, which in some cases can lead to a complete suppression of the magnetic phase transition. This critical regime has been observed in the same temperature range for Ln 2 CoFeO 6 (Ln = Sm, Eu, Dy, Ho, Pr) family (246–269 K), but lower than the simple LnFeO 3 (above 600 K). ,,− This system shows a very little deviation from the mean-field approach with a frustration index f = |θ CW |/ T N around 1.4.…”

Section: Results and Discussionsupporting

confidence: 63%

“…The introduced chemical disorder, also known as antisite disorder (ASD), 7 can suppress or even lead to different magnetic and electronic phases into the system. 8,9 Interestingly, in the disordered Ln 2 CoFeO 6 family it has been observed multiple magnetic and electrical properties leading to high thermoelectric figure-of-merit, 10 spin reorientation transitions, 11−13 spin canting, 14 pyroelectric current, 13 magnetic entropy change, 15,16 and Griffith's-like phase. 17 From all of these results, it seems natural that spin-charge-lattice interactions play an essential role on the observed complex magnetic and electrical phase diagram.…”

Section: Introductionmentioning

confidence: 99%

“…The strong correlated unusual charge transport and magnetic properties bring about additional useful functionalities. − An additional degree of complexity in the structure property relationship is introduced when a random assembly of BO 6 and B′O 6 octahedra is considered in the crystal field. The introduced chemical disorder, also known as antisite disorder (ASD), can suppress or even lead to different magnetic and electronic phases into the system. , Interestingly, in the disordered Ln 2 CoFeO 6 family it has been observed multiple magnetic and electrical properties leading to high thermoelectric figure-of-merit, spin reorientation transitions, − spin canting, pyroelectric current, magnetic entropy change, , and Griffith’s-like phase . From all of these results, it seems natural that spin-charge-lattice interactions play an essential role on the observed complex magnetic and electrical phase diagram.…”

Section: Introductionmentioning

confidence: 99%

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Insulator–Metal Transition in the Nd₂CoFeO₆ Disordered Double Perovskite

et al. 2020

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A comprehensive study on the correlations of structural, magnetic, and electronic properties of a new disordered Nd2CoFeO6 double perovskite has been conducted. The lack of strong divergence of the magnetic susceptibility suggests competition between magnetic interactions at the magnetic phase transition T N = 246 K, which is confirmed by the absence of a heat capacity peak. The magnetic susceptibility results indicate that the Fe/Co spins form a classical noninteracting paramagnetic state above T ≈ 2.2T N, while deviations are found at intermediate temperatures indicating the presence of strong short-range magnetic interactions. AC and DC electrical resistivity results reveal a melting of insulating polaronic behavior to a metallic-like conductivity, establishing an electronic crossover closely related to both local magnetic moment and lattice-parameter evolution. We show from density functional calculations that the magnetic configurations have a strict relation to this crossover, being associated to a transition from low to high spin states of Co3+ ions. This insulator–metal transition has its origin driven by a local increase in the magnetic moment of Co3+ ions. Our results point to a scenario in which a continuous spin-state transition triggers a crossover between distinct electronic states from the insulating polaronic behavior to permanent metallic states.

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Section: Results and Discussionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Insulator–Metal Transition in the Nd₂CoFeO₆ Disordered Double Perovskite

et al. 2020

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“…Overview of the maximum mass magnetic entropy change for some Gd-based inorganic materials at cryogenic temperatures ( T ≤ 25 K). ,,,,− ,− …”

Section: Resultsmentioning

confidence: 99%

“…This makes Gd-based materials the most popular magnetocaloric refrigerants for cryogenic applications. The following materials are cited examples of promising Gd-based magnetocalorics: inorganic paramagnetic salts such as Gd 2 (SO 4 ) 3 ·8H 2 O, oxides such as Gd 3 Ga 5 O 12 , − Gd 2 FeCoO 6 , GdCrO 4 , , and GdVO 4 , intermetallics such as GdPd 2 Si, − borides, carbides, and borocarbides such as GdCo 2 B 2 , − and many molecular organometallic materials, including metal and cluster complexes, metal–organic frameworks, and polymers. ,− Note that for room-temperature refrigeration, while Gd 5 Si 2 Ge 2 is still a reference material, Mn-based compounds have become the best candidates as they are free of “critical” elements. − …”

Section: Introductionmentioning

confidence: 99%

NaGdS₂: A Promising Sulfide for Cryogenic Magnetic Cooling

et al. 2022

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The development of effective and eco-friendly cooling technology demands an investigation of new magnetocaloric materials. Compounds containing gadolinium are one of the best candidates due to the large spin-only magnetic moment of Gd 3+ ion. This work reports on the magnetocaloric properties of the AGdS2 family (A = Li, Na, K, Rb) in relation to crystal chemistry of these compounds. These sulfides crystallize in two different structure-types: NaCl (A = Li) and -NaFeO2 (A = Na, K, Rb). Although one would expect the larger magnetocaloric effect to be associated to LiGdS2 due to its higher magnetic/non-magnetic mass ratio, our study demonstrates that the NaGdS2 member leads to the best properties among the investigated series. The change of structure from the 3D NaCl structure of LiGdS2 to the layered -NaFeO2 structure of NaGdS2 drastically improves the magnetocaloric properties.Hence, thanks to its structural features associated to negligible exchange interactions, NaGdS2 exhibits a magnetic entropy change up to 54 J kg -1 K -1 at 2.5 K for µ0H = 5 T, which is comparable to the top ranked inorganic Gd-based materials operating in the cryogenic temperature range. These magnetocaloric figures of merit provide evidence that Gd-based sulfides are promising materials for magnetic refrigeration and, more broadly, this highlights the potential of sulfides in that field.

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