Magnetic properties and room-temperature magnetocaloric effect in the doped antipervoskite compounds Ga1−xAlxCMn3 (0≤x≤0.15)

Wang, Bosen; Li, Chi-Chung; Lin, Shuai; Lin, Jiamao; Lj, Li; Tong, P.; Lu, W. J.; Zhu, Xiaobin; Yang, Zhihua; Song, Weiguo; Dai, J.; Sun, Ying

doi:10.1016/j.jmmm.2011.02.046

Cited by 18 publications

(9 citation statements)

References 35 publications

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“…Mn-based antiperovskites with the general formula Mn 3 AX, (A:Al, Zn, Ga, Ge,Sn, In) and (X:C,N,B), show alarge variety of magnetic orderingconfigurations and magnetostructural transitions with narrow hysteresis properties. [165][166][167][168][169][170] These materials crystallize in the Pm3m space group with cubic symmetry.M ni sl ocateda tt he face-centered positions,t he Aatomsr eside on the cube corners and the Xatoms occupy the octahedral sites at the cube center. Mn 3 GaC has been particularly investigated due to its narrow hysteresis at the first-order transition.…”

Section: Mn 3 Gac-based Antiperovskitesmentioning

confidence: 99%

“…Fort he case of Mn 3 GaC,t he compound orders ferromagnetically at a T C = 250 Ka nd undergoes an isostructural phase transitiont ot he AF state at T t = 165 K, as depicted in Figure 21 a. Thet ransition temperature is shifted towards lower temperatures at a rate of À4.4 KT À1 upon applyingamagnetic field. Therefore,i te xperiences an inverse MCE in ac omparable way to the Heusler alloys.B oth T t and T c can be tuned by variouse lemental substitutions on the Mn or Ga sites [168][169][170] as well as by external pressure. [194,195] Direct measurements of the adiabatic temperature change under am agnetic field of 3Tshow an MCE of up to À3.1 K for the first field application.…”

Section: Mn 3 Gac-based Antiperovskitesmentioning

confidence: 99%

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Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

et al. 2018

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Magnetic refrigeration relies on a substantial entropy change in a magnetocaloric material when a magnetic field is applied. Such entropy changes are present at first‐order magnetostructural transitions around a specific temperature at which the applied magnetic field induces a magnetostructural phase transition and causes a conventional or inverse magnetocaloric effect (MCE). First‐order magnetostructural transitions show large effects, but involve transitional hysteresis, which is a loss source that hinders the reversibility of the adiabatic temperature change ΔTad. However, reversibility is required for the efficient operation of the heat pump. Thus, it is the mastering of that hysteresis that is the key challenge to advance magnetocaloric materials. We review the origin of the large MCE and of the hysteresis in the most promising first‐order magnetocaloric materials such as Ni–Mn‐based Heusler alloys, FeRh, La(FeSi)13‐based compounds, Mn3GaC antiperovskites, and Fe2P compounds. We discuss the microscopic contributions of the entropy change, the magnetic interactions, the effect of hysteresis on the reversible MCE, and the size‐ and time‐dependence of the MCE at magnetostructural transitions.

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Section: Mn 3 Gac-based Antiperovskitesmentioning

confidence: 99%

Section: Mn 3 Gac-based Antiperovskitesmentioning

confidence: 99%

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

et al. 2018

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“…Neutron diffraction studies have shown that increase in C concentration results in a lattice expansion, increasing Mn-Mn next nearest neighbor distance. This is implied to cause an increase in Mn 3d -C 2p hybridization which strengthens Mn-C-Mn antiferromagnetic interactions over Mn-Mn ferromagnetic interactions causing the sample to transform via a discontinuous volume expansion [1,5,11,12,13]. However, X-ray absorption near edge structure (XANES) studies at Mn L edges did not show any change in near edge features as a function of C content that would suggest an increase in Mn 3d -C 2p hybridization [3].…”

Section: Introductionmentioning

confidence: 96%

Effect of carbon content on magnetostructural properties of Mn3GaC

Dias

Priolkar

Nigam

2014

Journal of Magnetism and Magnetic Materials

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Effect of carbon content on magnetostructural transformation in antiperovskites of the type Mn 3 GaC x (x = 0.8, 1.0 and 1.05) has been investigated. It is found that, increase in carbon content changes the ground state from ferromagnetic metallic (x = 0.8) to antiferromagnetic semiconducting (x = 1.05) type. This has been attributed to localization of itinerant Mn 3d electrons due to increased Mn3d -C2p hybridization. Such a hybridization strengthens Mn-C-Mn antiferromagnetic interactions over Mn-Mn ferromagnetic interactions. Further, magnetic field can be used as a tool to modulate the relative strengths of these ferromagnetic and antiferromagnetic interactions thereby affecting the nature and strength of magnetocaloric properties.

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“…One such example is the Mn-based antiperovskite structural compounds, Mn 3 AX (A = metal or semiconducting elements and X = C or N), which have attracted considerable attention due to their electrical and magnetic transport properties [51], with a magnetic state and transition temperature strongly affected by A element doping [52].…”

Section: Magnetismmentioning

confidence: 99%

Synthesis and Characterization of New MAX Phase Alloys

Mockuté¹

2014

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The cover image is based on a cross-sectional TEM micrograph of a high current pulsed cathodic arc deposited (Cr 0.8 Mn 0.2 ) 2 AlC thin film (20 nm thickness), revealing its island-like nature. © Aurelija MockutėISBN: 978-91-7519-407-3 ISSN 0345-7524 Printed by LiU-Tryck Linköping, Sweden, 2014 AbstractThis Thesis explores synthesis and characterization of new MAX phase alloys (M = early transition metal, A = A-group element, and X = C or N), based on incorporation of M and X elements previously not considered. My primary focus is on M = Mn for attaining magnetic properties, and on X = O for potential tuning of the transport properties. A recent theoretical study predicted (Cr 1-x Mn x ) 2 AlC MAX phase to be a stable magnetic nanolaminate. I aimed at realizing this material and through a combinatorial approach based on magnetron sputtering from elemental targets, the first experimental evidence of Mn incorporation (x = 0.16) in a MAX phase is presented. The corresponding MAX phase was also synthesized using cathodic arc film deposition (x = 0.20) and bulk synthesis methods (x = 0.06). The primary characterization techniques were X-ray diffraction and high-resolution (scanning) transmission electron microscopy in combination with energy dispersive X-ray spectroscopy and/or electron energy loss spectroscopy, to obtain a precise local quantification of the MAX phase composition and to perform lattice resolved imaging. For epitaxial film growth of (Cr 1-x Mn x ) 2 AlC, evidence is presented for the formation of (Cr 1-y Mn y ) 5 Al 8 , exhibiting a bcc structure with an interplanar spacing matching exactly half a unit cell of the hexagonal MAX phase. Consequently, routinely performed X-ray diffraction symmetric θ-2θ measurements result in peak positions that are identical for the two phases. As (Cr 1-y Mn y ) 5 Al 8 is shown to display a magnetic response, its presence needs to be taken into consideration when evaluating the magnetic properties of the MAX phase. Methods to distinguish between Populärvetenskaplig sammanfattningMaterialvetenskap inkluderar forskning på material, dess syntes, struktur och sammansättning samt resulterande egenskaper, med fokus på att utveckla nya material skräddarsydda för specifika ändamål.En viktig del inom materialvetenskapen är forskning på tunna filmer, d.v.s. lager av material med tjocklek från ett atomlager till några mikrometer. Egenskaperna hos en yta, till exempel friktion, slitmotstånd, ledningsförmåga, eller utseende, kan förbättras genom att applicera en lämplig tunnfilm.Den här avhandlingen handlar om en grupp material som kallas MAX-faser. M står för en övergångsmetall (t.ex. Ti, Cr, Nb, Sc), A för ett element från grupp A i det periodiska systemet (t.ex. Al, Si, Ge, Ga), och X står för C eller N. Atomer av tre sådana olika element staplas i en struktur bestående av rena atomlager, t.ex. M-X-M-A-M-X-M-A. Ti 2 AlC, Cr 2 AlC, Ti 3 SiC 2 och Ti 4 AlN 3 är några exempel av mer än 60 hittills upptäckta MAX-faser. Det extra spännande med MAX-faser är att de kombinerar ...

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Magnetic properties and room-temperature magnetocaloric effect in the doped antipervoskite compounds Ga1−xAlxCMn3 (0≤x≤0.15)

Cited by 18 publications

References 35 publications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Effect of carbon content on magnetostructural properties of Mn3GaC

Synthesis and Characterization of New MAX Phase Alloys

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