Effect of Si Substitution and Annealing on Magnetocaloric Properties in TbCo2 |
| M. Janatova, J. Poltierova Vejpravova, P. Javorsky, J. Prokleska, P. Svoboda and S. Danis
Charles University Prague, Faculty of Mathematics and Physics, DCMP, Ke Karlovu 5, 121 16 Prague 2, Czech Republic |
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| Received: 9 07 2007; |
| We report on magnetocaloric properties of the as-cast and annealed TbCo2 with partial substitution of cobalt by silicon. The samples were characterized by powder X-ray diffraction and investigated by heat capacity measurements (8-300 K, in fields 0 T and 1 T). TbCo2 undergoes a second-order type phase transition at TC = 240 K, from paramagnetic to ferrimagnetic state;similar behavior was revealed in the Si-doped compounds. The temperature dependence of magnetic entropy and the corresponding magnetocaloric effect were derived for all studied samples. The influence of the heat treatment and Si doping on magnetocaloric properties will be discussed in context of the analogue case Er(Co1-xSix)2. |
| DOI: 10.12693/APhysPolA.113.311 PACS numbers: 65.40.Gd, 75.30.Sg |