臺灣博碩士論文加值系統

在BiFeO3與BiFeO3(0.95)-BaTiO3(0.05) 的高解析即時變溫同步輻射X-ray繞射之繞射圖譜分析呈現菱形晶系晶軸夾角αR之相對極小值於350 ~ 400 ℃之間，經由實驗結果證實為接近尼爾溫度的磁電耦合特徵，也就是表現於ZFH變頻介電常數的極值變化。BiFeO3以及BiFeO3(0.95)-BaTiO3(0.05) 之晶體結構從菱形晶系轉變成立方晶系的相變溫度分別發生在大約850 ℃與830 ℃。摻雜BaTiO3不但可以有效提高介電值並降低漏電流，而且BiFeO3(0.95)-BaTiO3(0.05) 的介電損耗在150 ℃以下低於0.04。

In-situ high-resolution synchrotron X-ray diffraction reveals a local minimum in rhombohedral distortion angle αR (associated with an inflection in the lattice constant aR) in the region of 350 ~ 400 oC in BiFeO3 (BFO) and 5 mol% BaTiO3-doped BiFeO3 (BiFeO3(0.95)-BaTiO3(0.05)). It confirms a coupling of ferroelectric and magnetic parameters near the Néel temperature, which is responsible for frequency-dependent maxima in dielectric permittivity. A rhombohedral–cubic structure transition occurs near 850 and 830 oC in BiFeO3 and BiFeO3(0.95)-BaTiO3(0.05), respectively. The BaTiO3-doping can enhance dielectric and ferromagnetic responses, and reduce electric leakage. The dielectric loss of BiFeO3(0.95)-BaTiO3(0.05) remains less than 0.04 below 150 oC.

中文摘要............................................................ i
英文摘要........................................................... ii
致謝.............................................................. iii
目錄............................................................... iv
圖目錄............................................................ vii
表目錄............................................................. ix
第一章 序論.......................................................... 1
1.1 鐵電材料的晶體點群................................................ 1
1.1.1 壓電性........................................................ 2
1.1.2 焦(熱)電性.................................................... 3
1.1.3 鐵電性........................................................ 3
1.2 鐵電材料的特徵性質................................................ 3
1.2.1 自發極化與晶域................................................. 4
1.2.2 相變溫度...................................................... 4
1.2.3 電滯曲線...................................................... 4
1.3 複鐵性鐵電材料- BiFeO3 .......................................... 5
1.4 文獻回顧........................................................ 6
1.5 研究動機........................................................ 7
第二章 實驗理論...................................................... 8
2.1 BiFeO3 晶體結構................................................. 8
2.2 X-ray 繞射原理.................................................. 9
2.2.1 布拉格定律..................................................... 9
2.2.2 X-ray 繞射光譜分析............................................ 10
2.2.3 同步輻射..................................................... 11
2.3 介電常數理論.................................................... 12
2.4 電滯曲線....................................................... 14
2.5 漏電流......................................................... 17
2.6 磁性原理....................................................... 18
第三章 實驗流程..................................................... 21
3.1 樣品製備....................................................... 21
3.1.1 BiFeO3 的調配與球磨........................................... 21
3.1.2 鍛燒......................................................... 25
3.1.3 高能球磨..................................................... 26
3.1.4 燒結......................................................... 26
3.2 介電常數分析.................................................... 30
3.3 結構相變....................................................... 30
3.4 鐵電性與電性量測分析............................................. 31
3.4.1 電滯曲線量測.................................................. 31
3.4.2 漏電流量測.................................................... 32
3.5 磁性量測分析.................................................... 33
第四章 實驗結果與討論................................................ 34
4.1 表面形態分析.................................................... 34
4.2 變溫介電常數分析................................................ 35
4.3 結構相變....................................................... 37
4.4 電滯曲線量測.................................................... 42
4.5 漏電流......................................................... 44
4.6 磁性量測分析.................................................... 45
第五章 結論......................................................... 47
參考文獻........................................................... 49

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