Bibliographic Details
| Title: |
Modeling the magnetic properties and magnetocaloric effect of La0.7Sr0.3Mn0.9Ti0.1O3. |
| Authors: |
Yahyaoui, S.1, Khalfaoui, M.1, Kallel, S.2, Kallel, N.2,3, Amaral, J.S.4,5, Ben Lamine, A.1 aben_lamin@yahoo.fr |
| Source: |
Journal of Alloys & Compounds. Nov2016, Vol. 685, p633-638. 6p. |
| Subjects: |
Magnetic properties of perovskite, Magnetocaloric effects, Lanthanum compounds, Brillouin scattering, Mean field theory, Angular momentum (Mechanics), Equations of state |
| Abstract: |
We present a simple analysis based on the molecular field theory and on the Bean-Rodbell model to justify the magnetocaloric effect (MCE) on La 0.7 Sr 0.3 Mn 0.9 Ti 0.1 O 3 . The modeling the magnetic properties of the La 0.7 Sr 0.3 Mn 0.9 Ti 0.1 O 3 was investigated. Using the Brillouin function we have determined the mean field exchange parameter λ and the total angular momentum J of the perovskite. The mean-field equation of state leads the system to second order ferromagnetic (FM)-paramagnetic (PM) phase transition. The expressions describing entropy and its change under the influence of magnetic field have been derived. A large magnetic entropy (−ΔS M ) has been observed in our sample with a peak centered on the Curie temperature (T C = 210 K). The theoretical calculations are compared with experimental behavior. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
