Giant Magnetocaloric Effect in the Region of Magnetic Phase Transition in Mn (As,Sb) Compounds

Pankratov, N. Yu.; Mitsiuk, V. I.; Krokhotin, A.I.; Smarzhevskaya, A.I.; Говор, Г. А.; Никитин, С.А.; Рыжковский, В. М.

doi:10.4028/www.scientific.net/ssp.190.343

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…Manganites [258] include La 0.7 Ca 0.3 MnO 3 [227,262,264,285], La 0.48 Ca 0.52 MnO 3 [174], Na-deficient La 0.8 Na 0.2−x MnO 3 [185], La 0.67 Sr 0.16 Ca 0.17 MnO 3 [207], La 0.8−x K x Ba 0.05 Sr 0.15 MnO 3 [297], as well as containing critical rare earth La 0.7−x Pr x Ca 0.3 MnO 3 [160], GdMnO 3 [186], Gd 2 NiMnO 6 and Gd 2 CoMnO 6 [193], TbMnO 3 [165,252], DyMnO 3 [247], PrPb manganites [294], etc. Materials containing highly toxic arsenic include MnAs [123,131,210,238,245,246,256,265,273,276,282,289] and MnFe(P,As) [48,49,239,298]. However, interest is shifting towards less toxic materials without As, such as (Mn,Fe) 2 (P,Si) [125,126,150] doped with Ge [109,205] or B [184,201,215].…”

Section: ∆S T T C (K) ∆T S (K)mentioning

confidence: 99%

Viable Materials with a Giant Magnetocaloric Effect

Zarkevich

Zverev

2020

Crystals

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This review of the current state of magnetocalorics is focused on materials exhibiting a giant magnetocaloric response near room temperature. To be economically viable for industrial applications and mass production, materials should have desired useful properties at a reasonable cost and should be safe for humans and the environment during manufacturing, handling, operational use, and after disposal. The discovery of novel materials is followed by a gradual improvement of properties by compositional adjustment and thermal or mechanical treatment. Consequently, with time, good materials become inferior to the best. There are several known classes of inexpensive materials with a giant magnetocaloric effect, and the search continues.

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Section: ∆S T T C (K) ∆T S (K)mentioning

confidence: 99%

Viable Materials with a Giant Magnetocaloric Effect

Zarkevich

Zverev

2020

Crystals

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“…One is magnetoelastic transition, in which no crystal symmetry evolution but the change of lattice parameters is observed on both sides of the phase transition, such as MnFeP 1−x As x and La(Fe,Si) 13 [13][14][15]. The other is magnetostructural transition (MST), in which magnetic and crystallographic transitions oc-EPJ Web of Conferences 185, 05010 (2018) https://doi.org/10.1051/epjconf/201818505010 MISM 2017 cur simultaneously, such as Gd 5 (Si 2 Ge 2 ), Mn-Ni-Ga(Fe) [16,17] and MnAs [18][19][20]. In these cases, relatively smaller thermal/magnetic hysteresis than those possessing magnetostructural transition are generally revealed.…”

Section: Introductionmentioning

confidence: 99%

“…In these cases, relatively smaller thermal/magnetic hysteresis than those possessing magnetostructural transition are generally revealed. In numerous materials presenting FOMT, Mn-based intermetallic compounds, such as MnFePAs(Si/Ge) [13,18], MnAs [20,21], Ni-Mn-based [9][10][11], and Mn(Co,Ni)Ge systems [12,14], have extensively been investigated owing to the low cost and higher magnetic moment of Mn atoms, sometimes even 4 µ B per Mn atom [18].…”

Section: Introductionmentioning

confidence: 99%

Giant magnetocaloric effect in composites based on polymeric matrix and manganese arsenide

et al. 2018

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A field and/or temperature hysteresis is more than just an interesting incomprehensibility that occurs in materials with a first-order magnetic transition. Indeed, the reversibility of the magnetocaloric effect (MCE), being essential for magnetic heat pumps, strongly depends on the width of the thermal hysteresis and, therefore, it is necessary to find solutions to minimize losses associated with thermal hysteresis in order to maximize the efficiency of magnetic cooling devices. In this work, the polymer matrix composites with MnAs powder as reinforcing material were obtained and its MCE by direct method was studied. The influence of composite preparation process on the MCE was investigated. It was found that the MCE of bulk MnAs shows strong temperature hysteresis caused by magnetostructural transition from paramagnetic to ferromagnetic state, which also leads to an irreversible MCE at cooling at first magnetization. The reversible MCE of bulk MnAs in field 12.5 kOe is ΔT ∼ 0.4 K. It was shown that Mn-based polymeric composite cured in aligned magnetic field presents a reinforcement of the MCE temperature hysteresis. Thus, the MCE value in aligned composite is less than the value of the MCE in the bulk MnAs. It was shown that the decreasing of linear size of MnAs grains in the polymeric composite leads to sharp decreasing of the MCE to value of 0.05 K. It was established that the optimal properties, such as giant MCE and low temperature hysteresis, are found for composite hardened under pressure of 10 kBar. In this composite an increase of reversible MCE (compared to the bulk MnAs) till to the value of ΔT ∼ 1.2K was observed.

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“…Магнитокалорический эффект (МКЭ) достигает наибольшего значения в области магнитных фазовых переходов. К числу материалов, обладающих данным эффектом, относятся соединения Gd 5 (Si 2 Ge 2 ) [4][5], Fe-Rh [6][7][8], сплавы Гейслера [9][10][11], а также MnAs 1 [12][13][14][15]. 1 Материал для магнитного холодильника: пат.…”

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Magnetocaloric properties of the single crystal Mn0.99Fe0.01As

Говор

Larin

Митюк

et al. 2019

Vescì Akademìì navuk Belarusì. Seryâ fizika-matematyčnyh navuk

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The Stockbargard – Bridgman method yielded single crystals Mn0.99Fe0.01As. The effect of an external magnetic field with an intensity of up to 10 T on phase transitions in the single crystal Mn0.99Fe0.01As is studied. It is established that the magnetostructural phase transition in Mn0.99Fe0.01As is accompanied by a change in the entropy ΔSm, which is due to the transformation of the crystal structure. At temperatures above the temperature of the magnetostructural transition Tu = 290 K, the existence of an unstable magnetic structure is obtained. The magnetocaloric characteristics of the material under study are determined by an indirect calculation method based on the Maxwell thermodynamic relations and the Clapeyron – Clausius equation.

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Giant Magnetocaloric Effect in the Region of Magnetic Phase Transition in Mn (As,Sb) Compounds

Cited by 6 publications

References 10 publications

Viable Materials with a Giant Magnetocaloric Effect

Viable Materials with a Giant Magnetocaloric Effect

Giant magnetocaloric effect in composites based on polymeric matrix and manganese arsenide

Magnetocaloric properties of the single crystal Mn0.99Fe0.01As

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