11:00 〜 11:15
▲ [16a-Z19-8] Magnetocaloric properties of Ho1-xDyxB2 alloys
キーワード：magnetocaloric effect, magnetism, liquid hydrogen
The magnetocaloric effect (MCE) is a promising path for the development of refrigeration devices, based on solid-state technology. This effect is often characterized by two quantities: the magnetic entropy change and the adiabatic temperature change a material will experience when a field is applied either isothermally or adiabatically.
Recently, cryogenic magnetic refrigeration prototypes that use this effect has been proposed as a alternate pathway for liquefying hydrogen with higher effiency (>50%), and so magnetic materials with high magnetic entropy change are necessary.
Our recent discovery of gigantic magnetocaloric effect in HoB2 at TC = 15 K, is one of the most prominent materials for use in the liquefaction stage. However, not only materials with high magnetocaloric perfomance near the liquid hydrogen point are necessary, but also in the whole range between LH2 and LN2 (20.3 K-77 K).
To remedy this problem, we study the effect of Dy substitution in the magnetic and magnetocaloric properties of HoB2. Here, we report our experimental results and compare the results with other magnetocaloric materials in the same temperature range.
Recently, cryogenic magnetic refrigeration prototypes that use this effect has been proposed as a alternate pathway for liquefying hydrogen with higher effiency (>50%), and so magnetic materials with high magnetic entropy change are necessary.
Our recent discovery of gigantic magnetocaloric effect in HoB2 at TC = 15 K, is one of the most prominent materials for use in the liquefaction stage. However, not only materials with high magnetocaloric perfomance near the liquid hydrogen point are necessary, but also in the whole range between LH2 and LN2 (20.3 K-77 K).
To remedy this problem, we study the effect of Dy substitution in the magnetic and magnetocaloric properties of HoB2. Here, we report our experimental results and compare the results with other magnetocaloric materials in the same temperature range.