X-Ray Investigations on M-Si-B Systems (M = Mn, Fe, Co). II. Some Features of the Fe-Si-B and Mn-Si-B Systems.

Aronsson, B.; Engström, Ingvar; Åselius, J.; Refn, Susanne; Westin, Gertrud

doi:10.3891/acta.chem.scand.14-1403

Cited by 51 publications

(23 citation statements)

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“…Fe 5 SiB 2 15 and Fe 5 PB 2 16 are isomorphous with Cr 5 B 3 . They were initially reported by Aronsson and Engström 15 and Rundqvist 16 in 1960 and 1962. Several other borides crystallize within the same structure type.…”

Section: Introductionmentioning

confidence: 97%

Magnetic properties ofFe5SiB2and its alloys with P, S, and Co

et al. 2016

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Fe 5 SiB 2 has been synthesized and magnetic measurements have been carried out, revealing that M sat = 0.92 MA/m at T = 300 K. The M vs T curve shows a broad peak around T = 160 K. The anisotropy constant, K 1 , estimated at T = 300 K, is 0.25 MJ/m 3 . Theoretical analysis of Fe 5 SiB 2 system has been carried out and extended to the full range of Fe 5 Si 1−x PxB 2 , Fe 5 P 1−x SxB 2 , and (Fe 1−x Cox) 5 SiB 2 compositions. The electronic band structures have been calculated using the Full-Potential Local-Orbital Minimum-Basis Scheme (FPLO-14). The calculated total magnetic moments are 9.20, 9.15, 9.59 and 2.42µ B per formula units of Fe 5 SiB 2 , Fe 5 PB 2 , Fe 5 SB 2 , and Co 5 SiB 2 , respectively. In agreement with experiment, magnetocrystalline anisotropy energies (MAE's) calculated for T = 0 K changes from a negative (easy-plane) anisotropy −0.28 MJ/m 3 for Fe 5 SiB 2 to the positive (easy-axis) anisotropy 0.35 MJ/m 3 for Fe 5 PB 2 . Further increase of the number of p-electrons in Fe 5 P 1−x SxB 2 leads to an increase of MAE up to 0.77 MJ/m 3 for the hypothetical Fe 5 P 0.4 S 0.6 B 2 composition. Volume variation and fixed spin moment calculations (FSM) performed for Fe 5 SiB 2 show an inverse relation between MAE and magnetic moment in the region down to about 15% reduction of the spin moment. The alloying of Fe 5 SiB 2 with Co is proposed as a practical realization of magnetic moment reduction, which ought to increase MAE. MAE calculated in virtual crystal approximation (VCA) for a full range of (Fe 1−x Cox) 5 SiB 2 compositions reaches the maximum value of 1.16 MJ/m 3 at Co concentration x = 0.3, with the magnetic moment 7.75µ B per formula unit. Thus, (Fe 0.7 Co 0.3 ) 5 SiB 2 is suggested as a candidate for a rare-earth free permanent magnet. For the stoichiometric Co 5 SiB 2 there is an easy-plane magnetization, with the value of MAE = −0.15 MJ/m 3 .

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Section: Introductionmentioning

confidence: 97%

Magnetic properties ofFe5SiB2and its alloys with P, S, and Co

et al. 2016

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“…synthesized the prototypical Mo 5 SiB 2 [ 19 ] followed by the synthesis of Fe 5 SiB 2 and Mn 5 SiB 2 phases in 1960. [ 20 ] T2 is an atomically layered material and crystallizes in the tetragonal I 4/ mcm symmetry. Furthermore, the T2 phases are attractive due to their high oxidation resistance, [ 21 ] nearly isotropic thermal expansion, [ 22 ] and superconductivity.…”

Section: Introductionmentioning

confidence: 99%

Out‐Of‐Plane Ordered Laminate Borides and Their 2D Ti‐Based Derivative from Chemical Exfoliation

et al. 2021

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Exploratory theoretical predictions in uncharted structural and compositional space are integral to materials discoveries. Inspired by M5SiB2 (T2) phases, the finding of a family of laminated quaternary metal borides, M′4M″SiB2, with out‐of‐plane chemical order is reported here. 11 chemically ordered phases as well as 40 solid solutions, introducing four elements previously not observed in these borides are predicted. The predictions are experimentally verified for Ti4MoSiB2, establishing Ti as part of the T2 boride compositional space. Chemical exfoliation of Ti4MoSiB2 and select removal of Si and MoB2 sub‐layers is validated by derivation of a 2D material, TiOxCly, of high yield and in the form of delaminated sheets. These sheets have an experimentally determined direct band gap of ≈4.1 eV, and display characteristics suitable for supercapacitor applications. The results take the concept of chemical exfoliation beyond currently available 2D materials, and expands the envelope of 3D and 2D candidates, and their applications.

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“…They also did not detect any ternary Fe-Si-B compounds. At present, FeSiB 3 is assumed to be a new observed phase, which is different with the other three ternary compounds Fe 5 Si 2 B, Fe 4.7 SiB 2 , and Fe 2 Si 0.4 B 0.6 described by Aronsson [34]. Further investigation should be performed to confirm the FeSiB 3 lattice structure.…”

Section: Resultsmentioning

confidence: 93%

The Use of Eutectic Fe-Si-B Alloy as a Phase Change Material in Thermal Energy Storage Systems

et al. 2019

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Fe-26.38Si-9.35B eutectic alloy is proposed as a phase change material (PCM) as it exhibits high latent heat, high thermal conductivity, moderate melting point, and low cost. For successful implementation of it in the latent heat thermal energy storage (LHTES) systems, we investigate the use of graphite as a refractory material that withstands long-term melting/solidification in contact with the Fe-26.38Si-9.35B alloy. The PCM has been thermally cycled up to 1–4 times below and above its melting point at the temperature interval of 20 °C or 100 °C. It is observed that this eutectic alloy shows good thermal stability over a small temperature range of 1057–1257 °C. Some SiC and B4C solid precipitation will be formed at the top of the alloy. However, it does not seem to increase with time. The graphite crucible as a refractory material will produce a protective layer of SiC and B4C that will hinder the interaction between the PCM and the crucible. The small volume change during solidification will not break the graphite crucible during cycling. The chemical wear or dissolution of the crucible is negligible. It demonstrates the viability of Fe-26.38Si-9.35B alloy as a heat storage material in this type of container.

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X-Ray Investigations on M-Si-B Systems (M = Mn, Fe, Co). II. Some Features of the Fe-Si-B and Mn-Si-B Systems.

Cited by 51 publications

References 0 publications

Magnetic properties ofFe5SiB2and its alloys with P, S, and Co

Magnetic properties ofFe5SiB2and its alloys with P, S, and Co

Out‐Of‐Plane Ordered Laminate Borides and Their 2D Ti‐Based Derivative from Chemical Exfoliation

The Use of Eutectic Fe-Si-B Alloy as a Phase Change Material in Thermal Energy Storage Systems

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