Influence of Partial Substitution of Fe by Mn on the Thermomagnetic Properties of Magnetocaloric LaFe_11.2Co_0.7Si_1.1 Alloy

Abstract

The aim of this paper was to study the influence of partial substitution of Fe by Mn in the LaFe11.2¡xMnxCo0.7Si1.1 (where x 0.1, 0.2 and 0.3) alloys. Measurements revealed that a systematic increase of Mn in the alloy composition resulted in a decrease of the Curie temperature, which correlated with a decrease of the lattice parameter of the La(Fe,Si)13-type phase. For samples corresponding to Mn content x 0.1 and 0.2 a decrease of magnetic entropy change was observed. However in the case of the sample with x 0.3 an increase of magnetic entropy change was detected.

Theoretical and Experimental Studies of Thermomagnetic Properties of the LaFe11.0Co0.8Si1.2 Alloy

“…Their structure is based on a face-centered cubic lattice with an F m3c space group [6]. A subsequent substitution of La by Ce [7], Pr, Ho [8], Dy [9], or Fe by Co [10,11], Ni [12], Mn [13,14] causes modifications in Curie temperature and magnetic entropy change.…”