臺灣博碩士論文加值系統

無線衛星行動通訊設備的小型化，可藉由先進的電路設計與模組化來縮小部分元件的體積與重量，然而更穩定的基礎材料能更有效使元件的體積縮小，並提高元件的品質。BaO•Ln2O3•4TiO2（Ln=La，Pr，Nd，Sm及Gd）系列具有較高的介電常數，並可藉由摻雜不同離子等方式，控制其共振頻率溫度係數，加上其擁有高品質因子，故非常適合使用於微波區段通訊用途上，做為諧振器及濾波器用。本研究探討於固態反應中，不同溫度及持溫時間對煆燒後粉體之影響，並配合不同溫度及燒結持溫時間來研究持溫時間及溫度對燒結體的影響，藉此了解兩持溫時間與溫度對陶瓷製程所扮演的角色。並利用添加Sm2O3粉末方式，利用特製壓力罐於高溫及飽和蒸氣壓條件下，製備BaO•Sm2O3•4TiO2微波介電陶瓷粉末，實驗結果可使BaO•Sm2O3•4TiO2微波介電陶瓷於1200℃下生成BaSm2Ti4O12相。

The miniaturization of microwave telecommunication productions can be achieved by miniaturizing the microwave devices using IC design and modulation. The small volume and good quality of devices can be effective improved by the more stable and reliable dielectric materials. BaO•Ln2O3•4TiO2 (Ln = La, Pr, Nd, Sm and Gd) system with a high dielectric constant, a low temperature coefficient of resonance frequency, tf, and a high Q factor is well known to be use in microwave telecommunication. This research is to study the effects of the temperature and soaking time on the calcining and sintering in solid-state process. A hybrid method of hydrothermal synthesizing BaO•Sm2O3•4TiO2 dielectric ceramic powders was investigated. The initial results show that the BaSm2Ti4O12 phase can be sintered at temperature lower than 1200℃.

中文摘要 i
Abstract ii
致謝 iii
目 次 iv
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1 前言 1
1.2 研究方向及目的 2
第二章 前人研究探討 4
第三章 理論基礎 15
3.1微波陶瓷材料簡介 15
3.1.1 微波介電材料 15
3.1.2 介電諧振器DR 18
3.1.3 BaO•Sm2O3•4TiO2之晶體結構 19
3.2 微波介電理論 23
3.2.1 介電常數 23
3.2.2 共振頻率溫度係數 29
3.2.3 品質因子 31
3.3 各種陶瓷粉末合成方法 38
3.3.1 為何要合成陶瓷粉末 38
3.3.2 固相反應法 41
3.3.3 溶液法 45
3.3.4 氣相反應法 50
3.4 水熱合成單晶陶瓷粉末 53
3.4.1 簡介 53
3.4.2 文獻探討 55
3.4.3 水熱反應機構 62
第四章 實驗方法 67
4.1實驗使用儀器規格與操作條件 67
4.1.1 XRD粉末繞射分析儀 67
4.1.2 DTA熱差分析儀 67
4.1.3 SEM掃描式電子顯微鏡 68
4.1.4 雷射粒度分析儀 68
4.1.5 性質量測 69
4.2 n值對BaO•Sm2O3•nTiO2微波介電陶瓷之影響研究 71
4.2.1 藥品選擇 71
4.2.2 實驗步驟及流程 71
4.3煆燒與燒結條件對BaO•Sm2O3•4TiO2影響之研究 74
4.3.1 實驗步驟及流程 74
4.4水熱合成法合成BaO•Sm2O3•4TiO2之製備研究 76
4.4.1 藥品選擇 76
4.4.2 實驗步驟及流程 76
第五章 結果與討論 79
5.1 n值對BaO•Sm2O3•nTiO2微波介電陶瓷之影響 79
5.2 煆燒與燒結條件對BaO•Sm2O3•4TiO2之影響 88
5.3 水熱合成法合成BaO•Sm2O3•4TiO2之製備研究 102
第六章 結論與建議 117
第七章 參考文獻 119

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