| Autor: |
Chen, Jing-Han, Bruno, Nickolaus M., Ning, Zhenhua, Shelton, William A., Karaman, Ibrahim, Huang, Yujin, Li, Jianguo, Ross Jr, Joseph H. |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
2018 Journal of Alloys and Compounds |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1016/j.jallcom.2018.02.050 |
| Popis: |
Off-stoichiometric Ni$_2$MnIn Heusler alloys have drawn recent attention due to their large magnetocaloric entropy change associated with the first-order magneto-structural transition. Here we present crystal structural, calorimetric and magnetic studies of three compositions. Temperature-dependent X-ray diffraction shows clear structural transition from a 6M modulated monoclinic to a L2$_1$ cubic. A significant enhancement of relative cooling power (RCP) was achieved by tuning the magnetic and structural stability through minor compositional changes, with the measured results quantitatively close to the prediction as a function of the ratio between the martensitic transition ($T_m$) temperature and austenite Curie temperature ($T_C$) although the maximal magnetic induced entropy change ($\Delta S_{max}$) reduction is observed in the same time. The results provided an evaluation guideline of RCPs as well as magnetic-induced entropy change in designing practical active materials. |
| Databáze: |
arXiv |
| Externí odkaz: |
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