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



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


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.
Journal of Physics: Condensed Matter


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


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], (Accessed June 15, 2024)


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Created March 18, 2010, Updated October 12, 2021