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Production of LaFe11.4Si1.6 compound at high temperature with a very short annealing time

V. S. KOLAT1, T. IZGI1, H. GENCER1, A. O. KAYA1, N. BAYRI1, S. ATALAY1,*

Affiliation

  1. Inonu University, Science and Arts Faculty, Physics Department, Malatya, Turkey

Abstract

In this work, LaFe11.4Si1.6 compound was prepared by arc-melting method and annealed at temperature of 1473 K for 5, 10, 30, 60, 180 and 7200 min. X-ray results indicated that as-cast compound mainly consists of α-Fe and LaFeSi phases. After 5 min annealing time at 1473 K, the mixture of α-Fe and LaFeSi was gradually transformed into cubic NaZn13 type phase of LaFe11.4Si1.6. X-ray result indicated that the sample annealed for 30 min crystallized in a single phase with a cubic NaZn13 structure. The magnetic characterizations of the samples were carried out at various temperatures and magnetic fields. The maximum magnetic entropy change (|ΔSm|) of the sample annealed at 1473 K for 30 min is 22.7 J/kg K at a magnetic field change of 5 T. It was shown that magnetic and magnetocaloric properties for short high temperature annealing of LaFe11.4Si1.6 compound are in a good agreement with previously reported values..

Keywords

NaZn13-type intermetallics compounds, Magnetocaloric effect, Magnetic entropy change, LaFeSi.

Submitted at: May 5, 2009
Accepted at: Aug. 7, 2009

Citation

V. S. KOLAT, T. IZGI, H. GENCER, A. O. KAYA, N. BAYRI, S. ATALAY, Production of LaFe11.4Si1.6 compound at high temperature with a very short annealing time, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 8, pp. 1106-1110 (2009)