钙钛矿与层状钙钛矿结构微波介质陶瓷

发布时间：2021-08-16 10:44

　　作为谐振器、滤波器、天线、波导等微波元件的关键材料,微波介质陶瓷在移动通讯、卫星通讯等微波通讯领域有着十分重要的应用。特别是5G移动通信技术的迅速发展,对具有超高Q值和近零谐振频率温度系数的中介电常数微波介质陶瓷提出了迫切的需求。本学位论文工作,系统研究了具有R-P结构的（Sr1-xCax）2Ti04和 Sr2[Ti1_x（A10.5Nb0.5）x]O4陶瓷以及具有钙钛矿结构的CaTi1-x（Al0.5Nb0.5）x03陶瓷的结构和微波介电性能,获得如下结论:（1）使用标准固相反应法合成了（Sr1-xCax）2TiO4（0≤x≤0.15）陶瓷。在x=0⁰.15组分范围内获得了空间群I4/mmm的四方Ruddlesden-Popper（R-P）（Sr1-xCax）2TiO4固溶体,只在x≥0.10时检测到少量Sr3Ti207第二相。在该陶瓷中,介电常数εr和谐振频率温度系数τ∫随着x增加均先降低后增加,而品质因子Qf初始时轻微下降而在x≥0.10快速下降。在x=0.075时获得微波介电性能的最佳组合:εr=39.3,Qf=93,550 GHz,τ... 

【文章来源】：浙江大学浙江省 211工程院校 985工程院校 教育部直属院校

【文章页数】：99 页

【学位级别】：博士

【文章目录】：
Acknowledgements
Abstract
摘要
Chapter 1 Literature review
    1.1 Introduction
    1.2 Microwave Dielectric Ceramics
        1.2.1 Progress History of Microwave Dielectric Ceramics
    1.3 Key Parameters For The Performance Of Microwave Dielectric Ceramics
    1.4 Testing Methods For Microwave Dielectric Properties
    1.5 Classification and Application of Microwave Dielectric Ceramic Systems
        1.5.1 Development trend of Microwave Dielectric Ceramics
    1.6 Perovskite Structure
        1.6.1 Layered Perovskite Structure
        1.6.2 Ruddlesden- Popper structure (R-P structure):
    1.7 Thesis proposal And Research Content
Chapter 2 (Sr_(1-x)Ca_x)TiO_4 Microwave dielectric ceramics with R-P structure (x～0-0.15)
    2.1 Introduction
    2.2 Experimental section
        2.2.1 Materials
        2.2.2 Experimental route
        2.2.3 Sample density
        2.2.4 Phase analysis and refinement of crystal structure
        2.2.5 Testing microwave dielectric ceramics
    2.3 Results and discussions
        2.3.1 Crystal structure analysis
    2.4 Microstructure Analysis
    2.5 Microwave dielectric characteristics
    2.6 Conclusions
Chapter 3 Structure and Microwave Dielectric Properties of Sr2[Ti_(1-x)(Al_(0.5)Nb_(0.5))_x]O_4(x≤0.50) ceramics
    3.1 Introduction
    3.2 Materials
        3.2.1 Experimental Route
    3.3 Results and Discussions
        3.3.1 Crystal Structure and Microstructure Analysis
    3.4 Microwave Dielectric Properties
    3.5 Conclusion
Chapter 4 Improved Microwave Characteristics of CaTi_(1-x)[Al_(0.5)Nb_(0.5)]_xO_3 ceramics
    4.1 Introduction
    4.2 Materials
        4.2.1 Experimental Method
    4.3 Results and Discussions
    4.4 Microwave Dielectric Characteristics
    4.5 Conclusion
Chapter 5 General Conclusion
References
List of Abbreviations
Resume
Publications List



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