Relative cooling power enhancement by tuning magneto-structural stability in Ni-Mn-In Heusler alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:744

Article

Chen, Jing-Han¹  Bruno, Nickolaus M.²  Ning, Zhenhua¹  Shelton, William A.³  Karaman, Ibrahim^4,5  Huang, Yujin⁶  Li, Jianguo⁶  Ross, Joseph H., Jr.^4,7 

[1] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[2] South Dakota Sch Mines & Technol, Dept Mech Engn, Rapid City, SD 57701 USA

[3] Louisiana State Univ, Dept Chem Engn, Baton Rouge, LA 70803 USA

[4] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

[5] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

[6] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[7] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

关键词: Magnetocaloric effect;    Heusler alloys;    Entropy;    Relative cooling power;   

DOI  :  10.1016/j.jallcom.2018.02.050

来源: Elsevier

【 摘 要 】

Off-stoichiometric Ni2MnIn 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. (C) 2018 Published by Elsevier B.V.

【 授权许可】

Free