Magnetic and Structural Study of Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x} (0.25 < x < 0.32) Magnetocaloric Compounds Prepared by Arc Melting

• Authors: L. Hawelek , P. Wlodarczyk , P. Zackiewicz , M. Polak , M. Kaminska , R. Puźniak , I. Radelytskyi , A. Kolano-Burian
• Languages of publication: EN

Abstracts

EN

Recently, room temperature magnetocaloric materials increasingly attracted attention in the development of magnetic refrigerators. In this paper, an effect of P/Ge substitution on the magnetic phase transition in the series of Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x} (0.25 < x < 0.32) magnetocaloric compounds prepared by the arc melting technique and subsequent homogenization process has been studied. Calorimetric and magnetization results show that the temperature of structural phase transition coincide with the Curie temperature and fall within the temperature range 270-355 K. The magnetic entropy change reaches the maximum value for the compound with x=0.28 and equals to 32 J/(kg K) for the magnetic field change of 5 T. The adiabatic temperature change for the same sample, measured using magnetocalorimeter, is equal to 1.2 K for the magnetic field change of 1.7 T. It was found that the increase of Ge content in the sample causes weakening of first order magnetic transition, which is manifested by the lowering difference in transition temperature measured in two zero-field-cooling and field-cooled-cooling regimes.

Keywords

EN

75.30.Sg; 75.30.Kz; 61.05.C-; 61.66.Fn

Discipline

• 61.66.Fn: Inorganic compounds
• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 61.05.C-: X-ray diffraction and scattering(for x-ray diffractometers, see 07.85.Jy; for x-ray studies of crystal defects, see 61.72.Dd, Ff)
• 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: 76-80

Dates

published

2015-7

received

2015-05-13

Contributors

author

L. Hawelek

• Institute of Non-Ferrous Metals, J. Sowińskiego 5, 44-100 Gliwice, Poland

author

P. Wlodarczyk

• Institute of Non-Ferrous Metals, J. Sowińskiego 5, 44-100 Gliwice, Poland

author

P. Zackiewicz

• Institute of Non-Ferrous Metals, J. Sowińskiego 5, 44-100 Gliwice, Poland

author

M. Polak

• Institute of Non-Ferrous Metals, J. Sowińskiego 5, 44-100 Gliwice, Poland

author

M. Kaminska

• Institute of Non-Ferrous Metals, J. Sowińskiego 5, 44-100 Gliwice, Poland

author

R. Puźniak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

I. Radelytskyi

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

A. Kolano-Burian

• Institute of Non-Ferrous Metals, J. Sowińskiego 5, 44-100 Gliwice, Poland

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Identifiers

DOI

10.12693/APhysPolA.128.76