A Comparative Studies of Magnetocaloric Effect in Ni-Mn-Cu-Ga and Ni-Mn-Pb-Ga Alloys

• Authors: K. Sielicki , R. Wróblewski , M. Leonowicz
• Languages of publication: EN

Abstracts

EN

Effect of Pb substitution for Cu on magnetocaloric properties of Ni₂Mn_{1-x}Cu_xGa (x = 0.25, 0.27, 0.29) alloy was investigated experimentally. The magnetic measurements of Ni-Mn-Pb-Ga alloys conducted at low field of 4kA/m (50 Oe) showed that their Curie points are above the room temperature (RT). The analysis of isothermal magnetic curves allowed the estimation of magnetic entropy change (ΔS_{M}). The highest calculated value of |ΔS_{M}|, ≈ 12 J/(kgK) and ≈ 1.8 J/(kgK), was registered for alloys containing 6.25 at.% of Cu and 6.75 at.% of Pb, respectively. The adiabatic temperature changes (ΔT) measured near RT are ≈ 0.4 K.

Keywords

EN

75.30.Sg

Discipline

• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 644-646

Dates

published

2015-02

Contributors

author

K. Sielicki

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland

author

R. Wróblewski

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland

author

M. Leonowicz

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.127.644