Effect of Dy substitution in the giant magnetocaloric properties of HoB2

Science and Technology of Advanced Materials

Suguru Iwasaki¹  Yoshito Saito²  Pedro Baptista de Castro²  Shintaro Adachi²  Ryo Matsumoto²  Hiroyuki Takeya²  Takafumi D. Yamamoto²  Kensei Terashima²  Yoshihiko Takano² 

[1] Hokkaido University;National Institute for Materials Science;

关键词: magnetic refrigeration;    magnetocaloric effect;    adiabatic temperature change;   

DOI  :  10.1080/14686996.2020.1856629

来源: DOAJ

【 摘 要 】

Recently, a massive magnetocaloric effect near the liquefaction temperature of hydrogen has been reported in the ferromagnetic material HoB2. Here we investigate the effects of Dy substitution in the magnetocaloric properties of Ho1-xDyxB2 alloys (x = 0, 0.3, 0.5, 0.7, 1.0). We find that the Curie temperature (TC) gradually increases upon Dy substitution, while the magnitude of the magnetic entropy change |ΔSM| and adiabatic temperature change ΔTad showed a gradual decrease. On the other hand, due to the presence of successive transitions in these alloys, the peak height of the above magnetocaloric properties tends to be kept in a wide temperature range, leading to a relatively robust figure of merit in a wide temperature span. These alloys could be interesting candidates for magnetic refrigeration in the temperature range of 10–60 K.

【 授权许可】

Unknown