Power Losses in LaFe_{x}Co_{y}Si_{1.1} Intermetallics near the Magnetic Phase Transition

• Authors: R. Gozdur , M. Lebioda , Ł. Bernacki
• Languages of publication: EN

Abstracts

EN

The paper presents magnetic parameters of LaFe_{x}Co_{y}Si_{1.1} bulk specimens proving strong magnetocaloric effect. The main research work was oriented on measurements of the alloy's power losses according to IEC 60404 standards and validated with unbalanced bridge method and other methods. The measurements of the LaFe_{10.8}Co_{1.1}Si_{1.1} specimens were determined in the range of temperatures near the Curie temperature where the magnetocaloric effect is the strongest. Power losses were taken into account mainly for the evaluation of usefulness and efficiency in the magnetic refrigeration applications. The results of presented measurements testify that the most suitable range of temperature and the best operational conditions are very close to the point of magnetic phase transition and slightly above it. It indicates that the magnetic state between the T_{ΔSmax} and T_{c} is more effective for the magnetic refrigeration applications due to lower power losses and high level of the isothermal changes of entropy. Operating temperature below the T_{ΔSmax} in ferromagnetic state is improper because of the increasing power losses which achieve the level of 130 mJ/kg for main frequency and decrease to 20 mJ/kg for the value of 0.1 Hz.

Keywords

EN

75.30.Sg; 75.30.Kz; 75.50.Bb

Discipline

• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 75.50.Bb: Fe and its alloys
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 1
• Pages: 98-103

Dates

published

2015-7

received

2015-02-02

Contributors

author

R. Gozdur

• Łódź University of Technology, Department of Semiconductor and Optoelectronics Devices, B. Stefanowskiego 18/22, 90-924 Lódź, Poland

author

M. Lebioda

• Łódź University of Technology, Institute of Electrical Engineering Systems, B. Stefanowskiego 18/22, 90-924 Lódź, Poland

author

Ł. Bernacki

• Łódź University of Technology, Department of Semiconductor and Optoelectronics Devices, B. Stefanowskiego 18/22, 90-924 Lódź, Poland

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Identifiers

DOI

10.12693/APhysPolA.128.98