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研究生： Brianti Satrianti Utami
Brianti - Satrianti Utami
論文名稱： A Comprehensive Study Of (1-x)(Bi0.5Na0.5)TiO3-xBaTiO3 Lead Free Piezoceramic and Its Electric Field Induced Large Strain- Dependent Composition
A Comprehensive Study Of (1-x)(Bi0.5Na0.5)TiO3-xBaTiO3 Lead Free Piezoceramic and Its Electric Field Induced Large Strain- Dependent Composition
指導教授： 周振嘉
Chen-chia Chou
口試委員: 施劭儒
Shao-ju Shih
陳宜君
Yi-Chun Chen
學位類別： 碩士
Master
系所名稱： 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年： 2012
畢業學年度： 100
語文別： 英文
論文頁數： 116
外文關鍵詞： Intermediate Phase
相關次數： 點閱：322  下載：2 
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    • In this report, the comprehensive study of BNBxT piezoceramics is reported. (1-x)(Bi0.5Na0.5)TiO3-xBaTiO3 (abbreviated as BNBxT with x=0, x=0.03-0.12) piezoceramics had been successfully fabricated by oxide mixing route. The phase identification revealed that the ceramics with x=0-0.05 are having rhombohedral symmetry in the perovskite structure. For x=0.06-0.09 and x=0.10-0.12, the transition phase to tetragonal symmetry and tetragonal phase are identified, respectively. The electrical properties measurement revealed that the optimum properties is achieved by x=0.06-0.09. The giant strain was occurred during the piezoelectric measurement of BNB7T specimen in which achieved 0.32%. The giant strain is believed to be attributed from the coexistence of R3c symmetry and P4bm symmetry that construct the nano scale polarization. Once this nano scale polarization is induced by electric field, the nano size domain would be aligned along the direction of the field and this would exhibit the giant strain.
    The existence of mixed symmetry of R3c and P4bm is supported by the TEM image. Within x composition, the evolution of domain morphologies. The tweed like structure was observed almost in all grain of BNB3T-BNB9T. But tweed structure in BNB3T-BNB5T is much more complex. The long range domain and the nano size domain coexisted in one grain. In the other hand, BNB6T-BNB9T show more nano size domains. At BNB10T-BNB12T, the long range domains become obvious with the disappearance of nano size domains.
    Finally, the new built phase diagram is successfully interpreted from microstructural investigation through TEM, combined with the electrical properties measurement.

    ABSTRACT i Acknowledgements iii Table of Contents iv List of Figures vi List Of Tables x CHAPTER I INTRODUCTION 1 I. 1. BACKGROUND 1 I. 2. FUNDAMENTAL THEORY 4 I. 2. 1. DIELECTRICS 4 I. 2. 2. FERROELECTRICITY 6 I. 2. 3. ELECTROSTRICTION AND PIEZOELECTRICITY 9 I. 3. LITERATURE REVIEW 10 I. 4. PROBLEMS 19 I. 5. OBJECTIVES 20 CHAPTER II EXPERIMENTAL PROCEDURE 22 II. 1. RAW MATERIAL 24 II. 2. EXPERIMENTAL FLOWCHART 24 II. 3. CRYSTAL STRUCTURE BY X-RAY DIFFRACTION 26 II. 4. DENSITY MEASUREMENT 26 II. 5. SCANNING ELECTRON MICROSCOPY (SEM) 26 II. 6. TRANSMISSION ELECTRON MICROSCOPY (TEM) 27 II. 7. DIELECTRIC PROPERTIES MEASUREMENT 27 II. 8. ELECTROMECHANICAL MEASUREMENT 27 II. 9. FERROELECTRIC PROPERTIES (POLARIZATION VS ELECTRIC FIELD) 28 II. 10. PIEZOELECTRIC PROPERTIES (STRAIN VS ELECTRIC FIELD; D33) 29 II. 11. MECHANICAL PROPERTIES 30 CHAPTER III PHASE IDENTIFICATION AND MICROSTRUCTURAL INVESTIGATION 31 III. 1. TOLERANCE FACTOR 31 III. 2. X-RAY DIFFRACTION ANALYSIS 32 III. 3. MICROSTRUCTURAL INVESTIGATION BY SEM 38 CHAPTER IV ELECTRICAL PROPERTIES 43 IV. 1. DIELECTRIC PROPERTIES 43 IV. 2. FERROELECTRIC PROPERTIES 54 IV. 3. PIEZOELECTRIC PROPERTIES 61 IV. 3. 1. FIELD INDUCED STRAIN MEASUREMENT 61 IV. 3. 2. PIEZOELECTRIC CONSTANT (d33) MEASUREMENT 66 IV. 4. ELECTROMECHANICAL PROPERTIES 67 CHAPTER V MECHANICAL PROPERTIES 73 CHAPTER VI RELAXOR PHENOMENA 77 CHAPTER VII MICROSTRUCTURAL ANALYSIS 80 VII. 1. THE TEM INVESTIGATION ON BNB3T 80 VII. 2. THE TEM INVESTIGATION ON BNB6T 84 VII. 3. THE TEM INVESTIGATION ON BNB9T 87 VII. 4. THE TEM INVESTIGATION ON BNB12T 89 CHAPTER VIII A NEW BUILT PHASE DIAGRAM 91 CHAPTER IX SUMMARY 93 References xi Appendixes xviii

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