Structural and magnetic study of the MnAs magnetocaloric compound

AUTOR(ES)

Nascimento, Fabiana Cristina, Santos, Adenilson Oliveira dos, Campos, Ariana de, Gama, Sérgio, Cardoso, Lisandro Pavie

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2006-03

RESUMO

The temperature induced phase transition in MnAs is analyzed in this work using X ray Rietveld refinement. The results show the presence of the hexagonal phase (P6(3)/mmc) at room temperature and the first-order structural-magnetic transition to the orthorhombic phase (Pnma) around 318 K was followed in detail. The MnAs magnetic characterization allowed to obtain the transition temperature and a maximum value of 47 J/(kg.K) for the measured magnetocaloric effect for a magnetic field variation of 5 T.

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