Magnetostructural Transition and Magnetocaloric Effect in Co

发布时间：2021-07-21 19:09

　　The MnM’X-based（M’ = Ni or Co,X = Ge or Si）intermetallic compounds have received considerable attention in recent years thanks to their tunable magnetostructural transitions and the associated large magnetocaloric effect.As a member of MnM’X family,stoichiometric MnNiSi alloy has some interesting structural and magnetic properties,which can result in sufficient flexibility for the design of magnetocaloric materials.However,MnNiSi-based systems cannot achieve stable magnetostructural coupling thr... 

【文章来源】：南京理工大学江苏省 211工程院校

【文章页数】：85 页

【学位级别】：硕士

【文章目录】：
Abstract
1 Introduction
    1.1 Background
    1.2 Magnetoresponsive Effects
        1.2.1 Magnetocaloric Effect (MCE)
        1.2.2 Magnetostriction
    1.3 Magnetically ordered MM'X compounds:structure and magnetic properties
        1.3.1 MnCoSi
        1.3.2 MnCoGe
        1.3.3 MnNiGe
        1.3.4 MnNiSi
        1.3.5 How to fulfill the magnetostructural coupling in MnM'X alloys
    1.4 Main content and focus of the thesis
2 Experimental methods
    2.1 Sample preparation methods
        2.1.1 High-vacuum arc-melting furnace
        2.1.2 Vacuum tube sealing unit
        2.1.3 Muffle furnace
    2.2 Characterization techniques
        2.2.1 X-ray Diffractometry
        2.2.2 Differential Scanning Calorimetry
        2.2.3 Vibrating Sample Magnetometer
3 Structural and magnetic properties of Mn_(1-y)Co_yNiSi_(1-x)Ga_x alloys
    3.1 Structural properties of Mn_(1-y)Co_yNiSi_(1-x)Ga_x bulk alloys
    3.2 Influence of annealing treatment on structural properties of Mn_(0.6)Co_(0.4)NiSi_(1-x)Ga_xbulk alloys
    3.3 Structural phase transition of Mn_(0.5)Co_(0.5)NiSi_(1-x)Ga_x bulk alloys
    3.4 Magnetic properties of Mn_(0.5)Co_(0.5)NiSi_(1-x)Ga_x bulk alloys
    3.5 Chapter Summary
4 Structural and magnetic properties of Mn_(0.7)Co_(0.6)Ni_(0.7)Si_(1-x)Ga_x andMn_(0.7)Co_(0.7)Ni_(0.6)Si_(1-x)Ga_x alloys
    4.1 Structural properties of Mn_(0.7)Co_(0.6)Ni_(0.7)Si_(1-x)Ga_x and Mn_(0.7)Co_(0.7)Ni_(0.6)Si_(1-x)Ga_x bulkalloys
    4.2 Magnetostructural transformation in Mn_(0.7)Co_(0.6)Ni_(0.7)Si_(1-x)Ga_x system
    4.3 Chapter Summary
5 Magnetostructural transition and magnetocaloric effect in Mn_(1-y)Co_(2y)Ni_(1-y)Si_(1-x)Ga_x bulk alloys
    5.1 Structural properties of Mn_(1-y)Co_(2y)Ni_(1-y)Si_(1-x)Ga_x bulk alloys
    5.2 Magnetostructural transformation in Mn_(0.85)Co_(0.3)Ni_(0.85)Si_(1-x)Ga_x system
    5.3 Magnetocaloric effect in Mn_(0.85)Co_(0.3)Ni_(0.85)Si_(1-x)Ga_x system
    5.4 Chapter Summary
Conclusions
Acknowledgements
References
Appendices



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