Giant reversible barocaloric effects with high thermal cycle stability in epoxybonded(MnCoGe)_(0.96)(CuCoSn)_(0.04) composite  

作　　者：Yafei Kuang Kun Tao Bo Yang Peng Tong Yan Zhang Zhigang Sun Kewei Zhang Dunhui Wang Jifan Hu Liang Zuo 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China [2]Shanxi Key Laboratory of Magnetic and Electric Functional Materials and Applications,Taiyuan University of Science and Technology,Taiyuan 030024,China [3]Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031,China [4]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [5]School of Electronics and Information,Hangzhou Dianzi University,Hangzhou 310018,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第11期2528-2534,共7页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52301248,52271166,52071071,and 52275567);the Foundational Research Project of Shanxi Province,China(Nos.202203021222201 and 202203021212304);PhD Research Startup Foundation of Taiyuan University of Science and Technology(No.20222057);PhD Research Startup Foundation of Shanxi Province,China(No.20232051)。

摘　　要：Hexagonal MnMX-based(M=Co or Ni,X=Si or Ge)alloys exhibit giant reversible barocaloric effects.However,giant volume expansion would result in the as-cast MnMX ingots fragmenting into powders,and inevitably bring the deterioration of mechanical properties and formability.Grain fragmentation can bring degradation of structural transformation entropy change during cyclic application and removal of pressure.In this paper,giant reversible barocaloric effects with high thermal cycle stability can be achieved in the epoxy bonded(MnCoGe)0.96(CuCoSn)0.04 composite.Giant reversible isothermal entropy change of 43.0 J·kg^(−1)·K^(−1) and adiabatic temperature change from barocaloric effects(ΔT_(BCE))of 15.6 K can be obtained within a wide temperature span of 30 K at 360 MPa,which is mainly attributed to the integration of the change in the transition temperature driven by pressure of−101 K·GPa^(−1) and suitable thermal hysteresis of 11.1 K.Further,the variation of reversibleΔ_(TBCE) against the applied hydrostatic pressure reaches up to 43 K·GPa^(−1),which is at the highest level among the other reported giant barocaloric compounds.More importantly,after 60 thermal cycles,the composite does not break and the calorimetric curves coincide well,demonstrating good thermal cycle stability.

关 键 词：barocaloric effects cycle stability reversible isothermal entropy change reversible adiabatic temperature change MnCoGe alloys 

分 类 号：TB332[一般工业技术—材料科学与工程]