Title :
Magnetocaloric properties of La1-xPbxMnO3 (x=0.1,0.2,0.3) compounds
Author :
Min, S.-G. ; Kim, K.S. ; Yu, S.C. ; Suh, H.S. ; Lee, S.W.
Author_Institution :
Dept. of Phys., Chung-Buk Nat. Univ., Cheongju, South Korea
Abstract :
The magnetization behaviors have been investigated for La1-xPbxMnO3 (x=0.1,0.2,0.3) alloys. The Curie temperature increased from 195 to 352 K with increasing Pb concentration. A large magnetic entropy change (ΔSM), which is calculated from H versus M curves associated with the ferromagnetic-paramagnetic transitions, has been observed. The maximum ΔSM of La0.8Pb0.2MnO3 was 1.22 J/kg K at 294 K for an applied field of 1.5 T. Adiabatic temperature change (ΔTad) was measured directly by a special cryostat. The maximum ΔTad of La0.7Pb0.3MnO3 was 1.00 K at 352 K for an applied field of 2 T.
Keywords :
Curie temperature; ferromagnetic-paramagnetic transitions; lanthanum alloys; lead alloys; magnetisation; manganese alloys; 1.5 T; 294 K; 352 K; Curie temperature; La0.7Pb0.3MnO3; La0.8Pb0.2MnO3; La0.9Pb0.1MnO3; adiabatic temperature change; ferromagnetic-paramagnetic transitions; magnetic entropy change; magnetization behavior; magnetocaloric effect; magnetocaloric properties; Entropy; Isothermal processes; Magnetic field measurement; Magnetic materials; Magnetic properties; Magnetization; Paramagnetic materials; Physics; Power engineering and energy; Temperature measurement; Adiabatic temperature change; entropy change; magnetocaloric effect (MCE);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854823
