Reversible Magnetocaloric Effect of (La0.8Pr0.2)(0.67)Ba0.33MnO3 from Direct Measurements


Cetin S. K.

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, cilt.33, ss.683-691, 2020 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 33 Konu: 3
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s10948-019-05372-6
  • Dergi Adı: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
  • Sayfa Sayıları: ss.683-691

Özet

In this study, magnetic and magnetocaloric properties of (La0.8Pr0.2)(0.67)Ba0.33MnO3 manganite synthesized by sol-gel method were investigated. Under low magnetic field, temperature-dependent zero-field-cooled, field-cooled, and field-heated measurements were performed and the magnetic phase transition temperature corresponding to the sudden drop in magnetization was determined as 200 K. The magnetic entropy change value of the sample is determined as 2.2 J/kgK in 4.8 T magnetic field from isothermal magnetization curves. The adiabatic temperature change (Delta T-ad) of the sample was measured directly using an adiabatic calorimeter and measured as 0.72 K with a field change of 3 T. As a result of cyclic measurement of Delta T-ad, it is observed that the material has a reversible magnetocaloric effect (MCE) during the application and removal of the field 5 times. This reversible MCE property of the material is important in that it is the most desirable property of potential materials to be used in magnetic cooling systems.