Double magnetic entropy change peaks and high refrigerant capacity in Gd1-xHoxNi compounds in the melt-spun form
| Autor: | Jun-fan Jiang, Tangfu Feng, Renbing Sun, Hao Ying, Fang Wang, Xie Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Phase transition
Materials science Transition temperature Analytical chemistry General Physics and Astronomy 02 engineering and technology Liquid nitrogen Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Refrigerant 0103 physical sciences Curie temperature General Materials Science Orthorhombic crystal system Melt spinning 010306 general physics 0210 nano-technology |
| Zdroj: | Current Applied Physics. 18:1605-1608 |
| ISSN: | 1567-1739 |
| Popis: | Gd 1-x Ho x Ni melt-spun ribbons were fabricated by a single-roller melt spinning method. All the compounds crystallize in an orthorhombic CrB -type structure. The Curie temperature ( T C ) was tuned between 46 and 99 K by varying the concentration of Gd and Ho. A spin reorientation ( SRO ) transition is observed around 13 K. Different from T C , the SRO transition temperature is almost invariable for all compounds. Two peaks of magnetic entropy change (Δ S M ) were found. One at the higher temperature range was originated from the paramagnet-ferromagnet phase transition and the other at the lower temperature range was caused by the SRO transition. The maximum of Δ S M around T C is almost same. The other maximum of ΔS M around SRO transition, however, had significantly positive relationship with x. It reached a maximum about 8.2 J kg −1 K −1 for x = 0.8. Thus double large Δ S M peaks were obtained in Gd 1-x Ho x Ni melt-spun ribbons with the high Ho concentration. And the refrigerant capacity power reached a maximum of 622 J kg −1 for x = 0.6. Gd 1-x Ho x Ni ribbons could be good candidate for magnetic refrigerant working in the low temperature especially near the liquid nitrogen temperature range. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect