Loading…
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...
Saved in:
Published in: | Journal of applied physics 2023-11, Vol.134 (17) |
---|---|
Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
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 |