Exploring magnetocaloric and heat capacity behavior in Fe doped Mn5Ge3 alloy

Magnetocaloric properties of hexagonally structured Mn 5 − xFe xGe 3 ( x = 0.15, 0.3, and 0.5) alloys have been investigated using DC magnetization and heat capacity measurements. The maxima of entropy change, − Δ S m max ∼ 5.04 ( 5.57 ) J/kg K, along with an adiabatic temperature change of Δ T a d...

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Bibliographic Details
Published in:Journal of applied physics 2023-11, Vol.134 (17)
Main Authors: Lalita, Babu, P. D., Pardeep, Basheed, G. A.
Format: Article
Language:English
Subjects:
Doping
Gadolinium
Germanides
Heavy metals
Magnetic properties
Magnetic transitions
Manganese compounds
Mean field theory
Rare earth elements
Refrigerants
Specific heat
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Summary:Magnetocaloric properties of hexagonally structured Mn 5 − xFe xGe 3 ( x = 0.15, 0.3, and 0.5) alloys have been investigated using DC magnetization and heat capacity measurements. The maxima of entropy change, − Δ S m max ∼ 5.04 ( 5.57 ) J/kg K, along with an adiabatic temperature change of Δ T a d max ∼ 5.05 ( 7.25 ) K was observed for x = 0.15 ( 0.5 ) at an applied magnetic field H = 5 T. With the scaling analysis of − Δ S m, the rescaled curves collapse onto a single universal curve anticipated by the mean-field theory, revealing a second-order type of magnetic transition. Furthermore, − Δ S m max follows a power law of H n with n = 0.597 ( 3 ), 0.591(3), and 0.586(3) for Mn 5 − xFe xGe 3 ( x = 0.15, 0.3, and 0.5) alloys, respectively. The refrigerant capacity (RC) is increased from 400 J/kg (for x = 0.15) to 420 J/kg (for x = 0.5) with Fe doping in Mn 5Ge 3. Moreover, the coefficient of refrigerant performance (CRP) enhances with Fe doping from 0.06 (for x = 0.15) to 0.1 (for x = 0.5). Thus, high RC and reasonable CRP values for earth-abundant Mn-based Mn–Fe–Ge alloys promise the potential to replace the high-cost rare-earth (Gd) and heavy metal-based metallic magnetocaloric systems for use in environment-friendly magnetic refrigeration technology.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0164702