Theoretical calculus of magnetocaloric effects of La(FexSi1-x)13. / Cálculo teórico do efeito magnetocalórico do composto La(FexSi1-x)13.

AUTOR(ES)

Luciano Gomes de Medeiros Junior

DATA DE PUBLICAÇÃO

2006

RESUMO

The study of the magnetocaloric effect of the compound La(FexSi1-x)13 became very important, once recent experiments revealed that this compound exhibits great values of the isothermal entropy change (Δ S) and the adiabatic temperature change(ΔTad), which are the quantities used to characterize the power of refrigeration of any compound. We studied the magnetocaloric effect of the compound La(FexSi1-x)13 , using a simple theoretical model, in which only one band and only one sublattice are considered. We treated the disorder of the system with then on diagonal Coherent Potential Approximation (CPA). We got a good agreement between our theoretical calculations and experimental data. We also studied the effect of the addition of hydrogen on the magnetocaloric properties of the compound La(FexSi1-x)13. We also found very satisfactory theoretical results for the composition La(FexSi1-x)13Hy , compared with the experimental data.

ASSUNTO(S)

fisica da materia condensada matéria condensada magnetocaloric effect efeito magnetocalório

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