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研究生： 鄭煜昇
Zheng, Yu-Sheng
論文名稱： 氧化錳添加對俱X8R鈦酸鋇陶瓷介電性質與顯微結構之影響
Effects of MnO Doping on The Dielectric Properties and Microstructure of BaTiO3 with specification of X8R
指導教授： 方滄澤
Fang, Tsang-Tse
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2008
畢業學年度： 96
語文別： 中文
論文頁數： 137
中文關鍵詞： X8R 、relaxor 、氧化錳 、鈦酸鋇
外文關鍵詞： X8R, BaTiO3, releaxor, MnO
相關次數： 點閱：81  下載：6 
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    • 近幾年來，電容器要具有良好的溫度特性已經是必備的條件之一，某些應用上甚至特別要求在嚴苛的條件下還能夠擁有平緩的溫度特性。而積層陶瓷電容器，以X8R為例，其應用在許多不同類型的電子設備上，如設置在車輛引擎中的引擎電子控制元件(ECU)，輪軸轉角偵測器，反煞車制動裝置(ABS)模組等等，這些類型的電子設備被用在穩定引擎控制，駕駛控制，以及煞車控制，而這些電子設備的運作環境相當嚴苛，可以想像成氣溫約降至-20˚C的寒帶地區，或是夏天引擎剛發動時會上升至約+130˚C的溫度。因此，這些電子設備必須被要求設計成對於環境溫度變化有極良好的穩定性。
    在本研究中發現隨著MnO添加量的上升，整體之介電常數下降，但是相對於室溫之介電常數變化量ΔC/C25˚C在高溫時則有上升的趨勢，介電損失同樣的在高溫時的峰值也有增加的現象。在顯微結構方面，Mn會集中在晶界上，降低了晶界的移動能力而抑制了晶粒的成長。此外，也發現MnO的添加對於relaxor性質有相當重要的影響，根據modify Curie-Weiss law，當MnO添加量上升時會使得鈦酸鋇偏離relaxor而接近normal ferroelectric，表示隨著MnO的添加量的上升，relaxor性質下降。

    In recent years, capacitor is required to have excellent temperature characteristics. In particular, in some applications, it is desired that the temperature characteristics be smooth under harsh conditions. Multi-layer ceramic capacitors, like X8R, have some into use for various types of electronic equipment such as the engine electronic control units (ECU) mounted in engine compartments of automobiles, crank angle sensors, antilock brake system (ABS) modules, etc. These types of electronic equipments are used for stabilizing engine control, drive control, and brake control. The environment in which these types of electronic equipment are used is envisioned to be one in which the temperature fall s to as low as -20˚C or so in the winter in cold areas or the temperature rises to as high as +130˚C or in the summer right after engine startup. Therefore, these types of electronic equipment are required to have excellent circuit temperature stability.
    In this study, the increasing of MnO-doping decreases the dielectric permittivity. However, tangent loss and ΔC/C25˚C in high temperature range increased with additional MnO. In the aspect of microstructure, Mn prohibits the grain growth by decreasing the grain boundary mobility due to a high concentration of Mn near the grain boundary. Furthermore, Mn concentration also has important influence on the relaxor behavior. With increasing dopant of Mn, the BaTiO3 solid solution shows a decreased degree of deviation from the modify Curie–Weiss law. It indicates a crossover from relaxor behavior to a normal ferroelectric state, and results the reduction of relaxor behavior.

    摘要…………………………………………………………………Ⅰ Abstract……………………………………………………………Ⅱ 誌謝…………………………………………………………………Ⅲ 目錄…………………………………………………………………Ⅳ 表目錄………………………………………………………………Ⅶ 圖目錄………………………………………………………………Ⅷ 第一章 序論…………………………………………………………1 1.1 前言……………………………………………………………1 1.2 研究重點及目的………………………………………………3 第二章 基礎理論與文獻回顧………………………………………5 2.1 介電理論………………………………………………………5 2.1.1 介電常數(dielectric constant) ………………………5 2.1.2 介電損失(dielectric loss，tanδ) ……………………9 2.1.3 極化機制……………………………………………………11 2.2 鈦酸鋇的基本性質……………………………………………24 2.2.1 鈦酸鋇的晶體結構…………………………………………24 2.2.2 組成對鈦酸鋇顯微結構與介電性質的影響………………30 2.3 影響鈦酸鋇陶瓷介電常數的因素……………………………34 2.3.1 孔隙與混合相………………………………………………34 2.3.2 晶域(domain)與雙晶(twin) ……………………………36 2.3.3 晶粒效應與晶粒大小………………………………………37 2.4 添加物對鈦酸鋇性質的影響…………………………………41 2.4.1 等價離子對於居禮溫度的偏移及介電性質的影響………41 2.4.2 施體(donor)的添加對鈦酸鋇性質的影響…………………45 2.4.3 受體(acceptor)的添加對鈦酸鋇性質的影響……………46 2.4.4 補償性體(compensator)的添加對鈦酸鋇性質的影響……48 2.5 X8R材料及相關理論……………………………………………49 2.5.1 X8R材料的分類………………………………………………49 2.5.2 添加物對鈦酸鋇介電性質的影響…………………………49 2.5.3 擴散性相變化(diffuse phase transition，DPT)………57 2.5.4 core-shell結構……………………………………………61 第三章 實驗流程與方法……………………………………………63 3.1 實驗藥品………………………………………………………63 3.2 實驗流程………………………………………………………63 3.2.1 粉末配置及製作生胚………………………………………63 3.2.2 燒結條件……………………………………………………64 3.2.3 BCS((BaCa)SiO3)之合成……………………………………69 3.3 特性分析………………………………………………………71 3.3.1 X光繞射分析…………………………………………………71 3.3.2 密度分析……………………………………………………71 3.3.3 介電性質分析………………………………………………72 3.3.4 SEM顯微結構分析……………………………………………73 第四章 結果與討論…………………………………………………74 4.1 改變MnO添加量對於性質之影響………………………………74 4.1.1 介電性質分析………………………………………………74 4.1.2 SEM顯微結構分析……………………………………………81 4.1.3 XRD分析………………………………………………………85 4.2 改變MnO添加量對於relaxor性質之研究……………………89 4.2.1 Fitting to Curie-Weiss law……………………………89 4.2.2 Fitting to modify Curie-Weiss law…………………102 第五章 結論………………………………………………………114 第六章 參考文獻…………………………………………………115

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