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纳米多元稀土六硼化物R1-xCaxB6(R=La,Ce)的制备与表征及物理性能研究

中文摘要第4-6页
abstract第6-8页
1 Introduction第12-23页
    1.1 Rare-earth hexaborides (RB_6)第12-13页
    1.2 Synthesis methods of RB_6第13-14页
    1.3 Special characteristics of nanomaterials第14-15页
        1.3.1 Small size effect第14页
        1.3.2 Surface effect第14页
        1.3.3 Quantum size effect第14页
        1.3.4 Coulomb blockade and quantum tunneling effects第14-15页
    1.4 Recent developments in studies on optical properties of RB_6第15-16页
        1.4.1 Experimental studies on optical properties of RB_6第15-16页
        1.4.2 Theoretical studies on optical properties of RB_6第16页
    1.5 Outline of this thesis第16-18页
    References第18-23页
2 Theoretical aspect第23-31页
    2.1 First-principles calculations第23页
    2.2 Approximation method第23-24页
        2.2.1 Born-Oppenheimer approximation第23页
        2.2.2 Nonrelativistic approximation第23页
        2.2.3 Single electron approximation第23-24页
    2.3 Density functional theory第24页
    2.4 Pseudo-potential第24-26页
    2.5 Exchange-correlation energy第26-27页
    2.6 Introduction of CASTEP software第27-28页
    2.7 Theory of the optical absorption in solid第28-30页
    Reference第30-31页
3 Experimental and theoretical calculations methods第31-39页
    3.1 Raw materials第31页
    3.2 Preparation of nanocrystalline Ce_(1-x)Ca_xB_6第31-32页
    3.3 Preparation of ultrafine nanopowder La B_6第32-33页
        3.3.1 Preparation of polycrystalline rod La B_6第32页
        3.3.2 Process of evaporative condensation method第32-33页
    3.4 Sample characterization第33-36页
        3.4.1 XRD measurements第33-34页
        3.4.2 Morphology and microstructure measurements第34-36页
    3.5 Computational method第36-38页
    Reference第38-39页
4 Preparation and characterization of ultrafine nanopowder LaB_6 byevaporative condensation method第39-47页
    4.1 Introduction第39-40页
    4.2 Results and discussion第40-43页
        4.2.1 Phase composition of ultrafine nanopowder La B_6第40-41页
        4.2.2 Morphology of ultrafine nanopowder LaB_6第41页
        4.2.3 Microstructure of ultrafine nanopowder LaB_6第41-42页
        4.2.4 Morphological evolution mechanism of ultrafine nanopowderLaB_6第42-43页
    4.3 Conclusions第43-45页
    Reference第45-47页
5 An experimental and theoretical study on tunable optical behavior of Ca-doped nanocrystalline CeB_6第47-61页
    5.1 Introduction第47-48页
    5.2 Results and discussion第48-52页
        5.2.1 Phase composition of nanocrystalline Ce_(1-x)Ca_xB_6第48页
        5.2.2 Microstructure of nanocrystalline Ce_(1-x)Ca_xB_6第48-50页
        5.2.3 The correlation between reaction temperature and opticalproperties of nanocrystalline Ce_(0.8)Ca_(0.2)B_6第50-51页
        5.2.4 Optical absorption properties of nanocrytalline Ce_(1-x)Ca_xB_6第51-52页
    5.3 Theoretical analysis of Ce_(0.875)Ca_(0.125)B_6第52-58页
    5.4 Conclusions第58-59页
    References第59-61页
Publications第61页
Projects第61-62页
Acknowledgement第62页

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