A review of phase equilibria in Heusler alloy systems containing Fe, Co or Ni

Yin, Ming; Hasier, John; Nash, Philip

doi:10.1007/s10853-015-9389-y

Cited by 49 publications

(26 citation statements)

References 137 publications

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“…matches well with literature reports [24,25] It is also noted that the XRD patterns of the FCC series revel few diffraction peaks due to the low crystallinity of the samples, as depicted in Figure 3b. The peaks appearing at 2θ = 33.2° (110), 35.7° (002), and 39° (111) reflections are assigned to be from the monoclinic CuO structure (JCPDS 48-1548).…”

Section: Structure By Xrd and Ramansupporting

confidence: 91%

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Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

et al. 2017

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Nanosized FeCo-based solids were prepared via distinct preparation procedures. The catalytic performances of the solids for styrene oxidation in the presence of hydrogen peroxide were evaluated. The addition of promoters in FeCo such as Sn, Mo, or Cu was also investigated. The catalysts were characterized with XRD, Raman spectroscopy, TEM, chemical analyses, EPR and SEM-EDS. Of these solids obtained via four different methods, the catalyst prepared via the NC and CM procedures enabled a partial incorporation of the Sn into the FeCo matrix forming a very active phase, namely the Heusler alloy. This was ascribed to the high initial dispersion of Sn as a promoter into the FeCo matrix, which led to available FeCoSn (FCS) particles well dispersed and stable on the catalyst surface. In the case of incorporating Mo or Cu to the nanosized FeCo catalyst, a poor stability towards leaching was observed when operating under the same reaction conditions. Cu was much less active than both Sn and Mo, mainly leading to acetophenone, ethylbenzene, 2-phenyl ethanol, 2-phenyl acetic acid, and 2-phenyl acetaldehyde products. The best catalytic results under the optimized reaction conditions, especially at 50 • C and styrene/H 2 O 2 molar ratio of 1 were achieved with nanosized FCS. This solid had a conversion of ca. 70% and selectivity for aldehydes of ca. 27%, and the selectivity for the condensation products was 29%.

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Section: Structure By Xrd and Ramansupporting

confidence: 91%

“…Based on the reflections at about 26. [24,25]. These types of alloys have a CsCl-type structure and result from the process related to the thermal antisite defects in Fe and Co vacancies, especially for FeCoSn-and FeCoCu-based materials [25].…”

Section: Structure By Xrd and Ramanmentioning

confidence: 99%

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

et al. 2017

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“…The B2 unit cell may serve as a basic brick for the construction of other ordered structures, in particular those of ternary alloys like half-Heusler (XYZ, C1b structure) and Heusler (X 2 YZ, L2 1 structure) alloys [6], where X and Y are transition metal elements, notably 3d elements, and Z is a sp element. The structures of Heusler and half-Heusler can be described from four interpenetrating fcc sublattices, one being empty in half-Heusler alloys.…”

Section: Introductionmentioning

confidence: 99%

B2 long-range order in mechanically alloyed Fe53.3−0.6x Co46.7−0.4x Sn x (2 ≤ x ≤ 26) annealed at moderate temperatures

2016

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Recent interest in Fe-Co-Sn alloys stems from Heusler alloys. A Co 2 FeSnHeusler alloy is found to be unstable relative to other phases from ab initio calculations. However, it may be synthesized by non-equilibrium techniques. The present work focuses similarly on metastable ordered phases in ternary Fe-Co-Sn alloys. First, disordered phases of Sn in near-equiatomic Fe-Co are prepared by high-energy ball-milling. As-milled powders are then annealed to possibly produce long-range ordered phases. As-milled powders, of overall composition Fe 53.3-0.6x Co 46.7-0.4x Sn x (2 B x B 34), consist of a single supersaturated bcc phase for x \ *15 at.%. For larger values of x, they are primarily composed of a bcc phase, whose tin content still increases up to *26 at.%, and of extra phases, which include hexagonal (Fe,Co) 3 Sn 2 . Neutron diffraction patterns and 119 Sn Mössbauer spectra prove that bcc phases of as-milled alloys order to CsCl (B2)-type structures for x B 26 when annealed at 673 K. In addition, 119 Sn Mö ssbauer spectra reveal that a Sn content of *15 at.% marks the separation between domains with different short-range orders. From previous and present results, metastable B2 ordering of Sn-rich Co-Fe-Sn alloys is concluded to occur over a significant concentration range. temperatures below *1000 K for x ranging between *40 and *60 [1]. A perfect B2 FeCo alloy may be described as two interpenetrating simple cubic sublattices, in (0,0,0) and in (1/2,1/2,1/2), Fe on one and Co on the other. Ferromagnetism stabilizes the B2

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“…This cycle was repeated to check the repeatability of the measurement and reversibility of the transformation. Since this technique was developed to support ongoing work with half-metallic ferromagnetic Heusler alloys a selection of 50 mg crystallographically pure Heusler compounds from these ongoing studies [17][18][19] were used to validate the technique on more exotic samples.…”

Section: Methodsmentioning

confidence: 99%

Curie temperature determination via thermogravimetric and continuous wavelet transformation analysis

2017

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A cost effective method for conversion of a vertical tube thermogravimetric analysis system into a magnetic balance capable of measuring Curie Temperatures is presented. Reference and preliminary experimental data generated using this system is analyzed via a general-purpose wavelet based Curie point edge detection technique allowing for enhanced speed, ease and repeatability of magnetic balance data analysis. The Curie temperatures for a number of Heusler compounds are reported.

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A review of phase equilibria in Heusler alloy systems containing Fe, Co or Ni

Cited by 49 publications

References 137 publications

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

B2 long-range order in mechanically alloyed Fe53.3−0.6x Co46.7−0.4x Sn x (2 ≤ x ≤ 26) annealed at moderate temperatures

Curie temperature determination via thermogravimetric and continuous wavelet transformation analysis

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