Large enhancement of magnetocaloric effect induced by dual regulation effects of hydrostatic pressure in Mn_(0.94)Fe_(0.06)NiGe compound  

作　　者：He Zhou Dekun Wang Zhe Li Junzhuang Cong Ziyuan Yu Shuo Zhao Peng Jiang Daoyong Cong Xinqi Zheng Kaiming Qiao Hu Zhang 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]College of Physics and Electronic Engineering,Key Laboratory for Advanced Functional and Low Dimensional Materials of Yunnan Higher Education Institute,Qujing Normal University,Qujing 655011,China [3]MultiFields Technologies(Beijing)Co.Ltd.,Beijing 100190,China [4]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Materials Science & Technology》2022年第19期73-80,共8页材料科学技术（英文版）

基　　金：financially supported by the National Key Research and Development Program of China (No. 2017YFB0702704);the National Natural Science Foundation of China (No. 51671022);the State Key Lab of Advanced Metals and Materials (No. 2019-Z11);the Fundamental Research Funds for the Central Universities (No. FRF-TP-18-014B1);the Youth Teacher International Exchange & Growth Program (No. QNXM20210014)

摘　　要：MM'X(M,M'=transition metals,X=carbon or boron group elements)compounds could exhibit large magnetocaloric effect due to the magnetostructural transition,and the composition regulation has been widely studied to realize the magnetostructural transition.Moreover,the magnetostructural transition is also sensitive to the pressure.Herein,the effect of hydrostatic pressure on magnetostructural transformation and magnetocaloric effect has been investigated in Mn_(0.94)Fe_(0.06)NiGe compound.Dual regulation effect of lowering structural transition temperature and strengthening ferromagnetic(FM)state of martensite is realized by applying hydrostatic pressure,which would greatly improve the magnetocaloric effect of Mn_(0.94)Fe_(0.06)NiGe compound.Moreover,the first-principles calculations have also been performed to discuss the origin of the regulation effect under hydrostatic pressure,and it indicates that the hydrostatic pressure can stabilize the hexagonal structure and decrease the structural transition temperature.The maximum isothermal entropy change increases by 109%from 4.3 J/(kg K)under 0 GPa to 9.0 J/(kg K)under 0.402 GPa for a magnetic field change of 0-3 T.This work proves that the hydrostatic pressure is an effective method to regulate the magnetostructural transition and enhance magnetocaloric effect in MM'X compounds.

关 键 词：Magnetocaloric effect Magnetostructural transition Hydrostatic pressure Magnetic properties 

分 类 号：TM271[一般工业技术—材料科学与工程]