Magnetic structure of the magnetocaloric compound AlFe2B2

Cedervall, Johan; Andersson, Mikael; Sarkar, Tapati; Delczeg‐Czirjak, Erna K.; Bergqvist, Lars; Hansen, Thomas C.; Béran, P.; Nordblad, Per; Sahlberg, Martin

doi:10.1016/j.jallcom.2015.12.111

Cited by 59 publications

(53 citation statements)

References 27 publications

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“…The reported saturation magnetic moment also manifests up to 25% variation from the theoretically predicted saturation moment of 1.25 µ B /Fe. The first reported saturation magnetization and effective moment values for AlFe 2 B 2 were 1.9 (2) µ B /f.u. at 4.2 K and 4.8 µ B /Fe respectively [3].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, AlFe 2 B 2 has attracted a growing research interest as a rare-earth free ferromagnet that might have potential as a magneto-caloric material [1,2]. It is a layered material that has been identified as an itinerant ferromagnet [3].…”

Section: Introductionmentioning

confidence: 99%

“…The Curie temperature for annealed, melt-spun ribbons was reported to be 312 K [6]. A Mössbauer study on arc-melted and annealed sample has reported the Curie temperature of 300 K [2]. At the lower limit, the Curie temperature of spark plasma sintered AlFe 2 B 2 was reported to be 274 K [7].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of single crystalline itinerant ferromagnet AlFe2B2

Lamichhane

Lin

et al. 2018

Phys. Rev. Materials

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Single crystals of AlFe2B2 have been grown using the self flux growth method and then measured the structural properties, temperature and field dependent magnetization, and temperature dependent electrical resistivity at ambient as well as high pressure. The Curie temperature of AlFe2B2 is determined to be 274 K. The measured saturation magnetization and the effective moment for paramagnetic Fe-ion indicate the itinerant nature of the magnetism with a Rhode-Wohlfarth ratio M C M sat ≈ 1.14. Temperature dependent resistivity measurements under hydrostatic pressure shows that transition temperature TC is suppressed down to 255 K for p = 2.24 GPa pressure with a suppression rate of ∼ −8.9 K/GPa. The anisotropy fields and magnetocrystalline anisotropy constants are in reasonable agreement with density functional theory calculations. EXPERIMENTAL DETAILS Crystal growthSingle crystalline samples were prepared using a selfflux growth technique [10]. First we confirmed that our initial stochiometry Al 50 Fe 30 B 20 was a single phase liquid at 1200 • C. Starting composition Al 50 Fe 30 B 20 with elemental Al (Alfa Aesar, 99.999%), Fe (Alfa Aesar, 99.99%) arXiv:1805.06373v1 [cond-mat.mtrl-sci]

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of single crystalline itinerant ferromagnet AlFe2B2

Lamichhane

Lin

et al. 2018

Phys. Rev. Materials

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“…As a Cr 2 AlB 2 ‐type MAB phase, Fe 2 AlB 2 has attracted much attention since 2013 because of its magnetic phase transition around 304 K and the largest isothermal entropy changes, which makes it a prospective magnetocaloric material . Although the structure was determined by Jeitschko early in 1969, only the fabrication of single‐crystal Fe 2 AlB 2 and the determination of the crystal structure and Vickers' hardness have been reported .…”

Section: Introductionmentioning

confidence: 99%

“…In a pioneering work, Barsoum et al succeeded in the fabrication of high purity MoAlB bulk using hot pressing at 1200°C for 5‐6 hours, with a relative density of 94±1% and minor Al 3 Mo and Al 2 O 3 impurities, followed by subsequent characterization showing interesting properties and significant potential for UHTCs of the MAB phases . Despite a few studies on Fe 2 AlB 2 , polycrystalline Fe 2 AlB 2 and other bulk Cr 2 AlB 2 ‐type MAB‐phases have yet to be fabricated to date.…”

Section: Introductionmentioning

confidence: 99%

Rapid synthesis, electrical, and mechanical properties of polycrystalline Fe₂AlB₂ bulk from elemental powders

Bai

Wang

et al. 2017

J Am Ceram Soc

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Polycrystalline Fe 2 AlB 2 bulk including minor Al 2 O 3 is synthesized by reactive hot pressing from Fe, Al, and B powders at 1200°C and 30 MPa for 30 minutes, with a relative density of 96%. The present approach enables a markedly reduced holding time compared with previous studies. The derived Fe 2 AlB 2 shows an electrical resistivity of 2.27AE0.01 lΩÁm, Vickers hardness of 10.2AE0.2 GPa, flexural strength of 232AE25 MPa, compressive strength of 2101AE202 MPa, fracture toughness of 5.4AE0.2 MPaÁm 1/2 and work of fracture of 117AE12 J/m 2 . No dominant indentation cracks are observed, indicating that Fe 2 AlB 2 may be quite damage tolerant. Interestingly, a noncatastrophic failure is present in the SENB test, with a high work of fracture. The energy-absorbing mechanisms in inhibiting crack formation are delamination and pullout of Fe 2 AlB 2 grains. K E Y W O R D S borides, electrical conductivity, hot pressing, mechanical properties

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