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Magnetocaloric effects on TbCo3-XAlX compounds

R. TETEAN1,* , E. BURZO1, I. G. DEAC1

Affiliation

  1. Babes-Bolyai University, Faculty of Physics, RO-400084, Cluj-Napoca, Romania

Abstract

The TbCo3-XAlX compounds with x < 1 crystallize in a rhombohedral structure having m3R space group. The saturation magnetizations, at 4.2 K, increase as cobalt is replaced by aluminium from 3.8 B/f.u. (x=0) to 6.14 B/f.u. (x=1) in agreement with antiparallel ordering of Tb and Co sublattices. The magnetic behaviour of cobalt was analyzed in the spin fluctuation model. The adiabatic magnetic entropy changes, S∆ , were determined from magnetization data. The largest magnetic entropy change, max S∆ , was obtained for the sample with x=0.99 which have the Curie temperature around 300 K..

Keywords

Magnetocaloric effect, Magnetization, Rare-earth-transition metal compounds, Susceptibility.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

R. TETEAN, E. BURZO, I. G. DEAC, Magnetocaloric effects on TbCo3-XAlX compounds, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 501-503 (2006)