| Autor: |
Basso, Vittorio, Küpferling, Michaela, Curcio, Carmen, Bennati, Cecilia, Barzca, Alexander, Katter, Matthias, Bratko, Milan, Lovell, Edmund, Turcaud, Jeremy, Cohen, Lesley F. |
| Předmět: |
|
| Zdroj: |
Journal of Applied Physics; 2015, Vol. 118 Issue 5, p053907-1-053907-6, 6p, 1 Diagram, 2 Charts, 7 Graphs |
| Abstrakt: |
In this paper, we present the results of an experimental investigation on the magnetocaloric properties of hydrogenated La(Fe-Mn-Si)13-H with Mn substituting Fe to finely tune the transition temperature. We measured the specific heat under magnetic field cp(H, T) and the magnetic field induced isothermal entropy change Δs(H, T) of a series of compounds by direct Peltier calorimetry. Results show that increasing Mn from 0.06 to 0.46 reduces the transition temperature from 339K to 270K whilst the total entropy change due to a 1.5 T field is depressed from 18.7 J kg-1K-1 to 10.2 J kg-1K-1 and the thermal hysteresis similarly is reduced from 1.5K to zero. In the paper, we interpret the results in terms of a magnetic phase transition changing from the first to the second order with increasing Mn content, and we discuss the value of the results for magnetic cooling applications. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
