作為諧振器、濾波器、天線、波導(dǎo)等微波元件的關(guān)鍵材料,微波介質(zhì)陶瓷在移動通訊、衛(wèi)星通訊等微波通訊領(lǐng)域有著十分重要的應(yīng)用。特別是5G移動通信技術(shù)的迅速發(fā)展,對具有超高Q值和近零諧振頻率溫度系數(shù)的中介電常數(shù)微波介質(zhì)陶瓷提出了迫切的需求。本學(xué)位論文工作,系統(tǒng)研究了具有R-P結(jié)構(gòu)的（Sr1-xCax）2Ti04和 Sr2[Ti1_x（A10.5Nb0.5）x]O4陶瓷以及具有鈣鈦礦結(jié)構(gòu)的CaTi1-x（Al0.5Nb0.5）x03陶瓷的結(jié)構(gòu)和微波介電性能,獲得如下結(jié)論:（1）使用標(biāo)準(zhǔn)固相反應(yīng)法合成了（Sr1-xCax）2TiO4（0≤x≤0.15）陶瓷。在x=0⁰.15組分范圍內(nèi)獲得了空間群I4/mmm的四方Ruddlesden-Popper（R-P）（Sr1-xCax）2TiO4固溶體,只在x≥0.10時檢測到少量Sr3Ti207第二相。在該陶瓷中,介電常數(shù)εr和諧振頻率溫度系數(shù)τ∫隨著x增加均先降低后增加,而品質(zhì)因子Qf初始時輕微下降而在x≥0.10快速下降。在x=0.075時獲得微波介電性能的最佳組合:εr=39.3,Qf=93,550 GHz,τ... 

【文章來源】：浙江大學(xué)浙江省 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：99 頁

【學(xué)位級別】：博士

【文章目錄】：
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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