Improving the Magnetocaloric Performance of NiMnSnB Heusler Alloys with V Substitutions

Кират, Г.

doi:10.1007/s10948-022-06396-1

Cited by 1 publication

(2 citation statements)

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“…As illustrated in Figure 1, there is a wide halo at 2θ ≈ 22°, commonly attributed to the presence of an amorphous glass-coating layer, also observed in our previous works [19,21]. The presence of (220), (400), and (422) peaks in the XRD pattern must be attributed to the cubic structure [42]. Accordingly, the presence of the austenite phase is expected at room temperature in the studied Co2MnSiC samples.…”

Section: Structural Propertiessupporting

confidence: 78%

“…where K is a dimensionless form factor with a value of roughly 0.94 (which might vary As a result, the entire diffraction pattern has been successfully identified by the existence of the cubic austenite structure. We should state that the lack of (111) and (200) superlattice diffraction peaks confirms the presence of an A2-type cubic structure [42,43]. Indeed, no secondary phase was detected in all the XRD patterns.…”

Section: Structural Propertiesmentioning

confidence: 77%

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Carbon-Doped Co2MnSi Heusler Alloy Microwires with Improved Thermal Characteristics of Magnetization for Multifunctional Applications

et al. 2023

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In the current work, we illustrate the effect of adding a small amount of carbon to very common Co2MnSi Heusler alloy-based glass-coated microwires. A significant change in the magnetic and structure structural properties was observed for the new alloy Co2MnSiC compared to the Co2MnSi alloy. Magneto-structural investigations were performed to clarify the main physical parameters, i.e., structural and magnetic parameters, at a wide range of measuring temperatures. The XRD analysis illustrated the well-defined crystalline structure with average grain size (Dg = 29.16 nm) and a uniform cubic structure with A2 type compared to the mixed L21 and B2 cubic structures for Co2MnSi-based glass-coated microwires. The magnetic behavior was investigated at a temperature range of 5 to 300 K and under an applied external magnetic field (50 Oe to 20 kOe). The thermomagnetic behavior of Co2MnSiC glass-coated microwires shows a perfectly stable behavior for a temperature range from 300 K to 5 K. By studying the field cooling (FC) and field heating (FH) magnetization curves at a wide range of applied external magnetic fields, we detected a critical magnetic field (H = 1 kOe) where FC and FH curves have a stable magnetic behavior for the Co2MnSiC sample; such stability was not found in the Co2MnSi sample. We proposed a phenomenal expression to estimate the magnetization thermal stability, ΔM (%), of FC and FH magnetization curves, and the maximum value was detected at the critical magnetic field where ΔM (%) ≈ 98%. The promising magnetic stability of Co2MnSiC glass-coated microwires with temperature is due to the changing of the microstructure induced by the addition of carbon, as the A2-type structure shows a unique stability in response to variation in the temperature and the external magnetic field. In addition, a unique internal mechanical stress was induced during the fabrication process and played a role in controlling magnetic behavior with the temperature and external magnetic field. The obtained results make Co2MnSiC a promising candidate for magnetic sensing devices based on Heusler glass-coated microwires.

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Section: Structural Propertiessupporting

confidence: 78%

Section: Structural Propertiesmentioning

confidence: 77%