Direct Measurement of the Magnetocaloric Effect in Gd_5}Si_2}Ge_1.9}Ga_0.1}

Published

March 19, 2010

Author(s)

E. N. Palacios, G. F. Wang, R. Burriel, Virgil Provenzano, Robert D. Shull

Abstract

Doping with some metals (Fe, Cu, Ga, Mn, Al) reduces or removes the strong thermal hysteresis in the giant magnetocaloric alloys Gd_5}Si_x}Ge_1-x}_4}. We present heat capacity and direct measurements of the isothermal entropy change, ¢ST , and adiabatic temperature increment, ¢TS, of Gd_5}Si_2}Ge_1.9}Ga_0.1}. TC = 293.6 § 0.2 K is quite higher than in the non-substituted alloys and similar to the values in the Si rich compounds (i.e. x > 0:5). The results indicate that even this small addition of Ga makes the transition of second-order type, as a usual magnetic transition in the orthorhombic phase. The magnetocaloric parameters are lower than in the non-substituted compound and comparable to those for pure Gd.

Citation

Journal of Physics: Condensed Matter

Pub Type

Journals

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Keywords

direct thermal measurements, Ga-doped Gd_{5}Ge_{2}Si_{2}, magnetic hysteresis, magnetocaloric alloys

Citation

Palacios, E. , Wang, G. , Burriel, R. , Provenzano, V. and Shull, R. (2010), Direct Measurement of the Magnetocaloric Effect in Gd_{5}Si_{2}Ge_{1.9}Ga_{0.1}, Journal of Physics: Condensed Matter, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903901 (Accessed October 6, 2024)