Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1594863 | Solid State Communications | 2008 | 5 Pages |
Abstract
A series of single phased Gd(Co1âxNix)2 compounds were prepared by an arc-melting method. The crystal structure, transport properties and magnetocaloric effect have been investigated by X-ray powder diffraction, and by measuring the temperature dependences of electrical resistivity, magnetization and heat capacity. All the samples exhibit the same single Laves-phase MgCu2-type structure, and lattice parameter a gradually decreases with increasing Ni content x. Only one paramagnetic-ferromagnetic (PM-FM) transition was found, and the Curie temperature TC decreases linearly with increasing x. The temperature dependences of electrical resitivity exhibit a metallic conductivity behaviour, and a clear change in slope near TC was found for all the present samples. The magnetic entropy change (ÎSM) and the adiabatic temperature change (ÎTad) as a function of temperature in magnetic fields (1 T, 4 T and 7 T) were estimated from the results of isothermal magnetization at various temperatures and temperature dependence of heat capacity. The peak values of âÎTad and âÎSM increase slightly with increasing x, and at a certain x they apparently increase with the increase of field. The Ni substitution effect on magnetic and transport properties, and the potential application of MCE for Gd(Co1âxNix)2 compounds are also discussed.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Lingwei Li, Katsuhiko Nishimura, Daisuke Tamei, Katsunori Mori,