Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 31: Poster II
MA 31.8: Poster
Wednesday, March 19, 2025, 17:00–19:30, P1
Design of CrxFe1−xMnCoNiGeSi high-entropy alloy with large barocaloric effect — •Yong Guo1,2, Yuanyuan Gong1, Tingting Zhang1, Zhishuo Zhang1, Bin Chen1, Fenghua Chen3,4, Zhengyi Jiang4, Feng Xu1, and Luana Caron2,5 — 1MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology , Nanjing 210094, PR China — 2Faculty of Physics, Bielefeld University, Bielefeld 33501, Germany — 3School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, PR China — 4School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia — 5Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany
This paper presents a high-entropy system exhibiting a large barocaloric effect. Experimental results confirm that equiatomic FeMnCoNiGeSi and CrMnCoNiGeSi are high-entropy solid-solutions with hexagonal and orthorhombic structures at room temperature, respectively. Further tuning Fe/Cr ratio in CrxFe1−xMnCoNiGeSi establishes a thermal-induced hexagonal-orthorhombic structural transformation. For the alloy with x=0.44−0.50, the structural transformation occurs at room temperature and can be induced by hydrostatic pressure. The barocaloric effect reaches -30.6 J/kgK for a pressure change from 5 to 0 kbar, and the entropy change per kbar is comparable to widely studied intermetallic compounds.
Keywords: Magnetocaloric effect; First-order Transformation; High-entropy alloys; Differential scanning calorimetry; X-ray diffractometers