臺灣博碩士論文加值系統

本研究嘗試以燃燒合成法製備奈米級SrFe12O19及SrTiO3微粉，利用金屬硝酸鹽（nitrate）及氨基乙酸（glycine）為反應物，藉由調整兩者計量比與反應混合物之氧氣平衡值以觀察其燃燒現象，並獲得不同特性之初得產物。初得產物經不同溫度熱處理後，以X光繞射判定其晶相發現，初得產物經 ≧ 900℃熱處理一小時後可獲得接近單晶SrFe12O19，而在相同OB值下，經燃燒反應後不需熱處理即可得SrTiO3單晶;為何鈣鈦礦結構SrTiO3之生成較M型六方晶SrFe12O19迅速之相關實驗結果及原因將於文中詳細說明。
另為探討高介電材料對陶瓷氧化物之電磁特性影響，進一步以燃燒合成法製備添加莫耳比0.00-0.15高介電材料鈦酸鍶（SrTiO3，以下稱STO）之強磁性M型鍶鐵氧體（Sr Fe12O1 9，以下稱SrM）並探討STO添加物於相對導磁率、介電常數及1 MHz-1.8 GHz之微波吸收行為的影響。由XRD分析可知，初得產物中含副產物SrCO3與 Fe2O3及預期中之SrM與STO產物。之後，經熱處理後所獲得之產物即以SrM與STO組成。於SrM中添加STO不僅可改善其 ，亦可修正其 。此外，我們發現STO含量增加則其產物具有較寬之反射特性，但其吸收效果呈現遞減趨勢。

關鍵詞：燃燒合成；氧氣平衡值；硝酸鹽；氨基乙酸；鍶鐵氧體；鈦酸鍶；相對導磁率；相對介電常數

In this study, nanopowders of SrFe12O19 and SrTiO3 were tried to prepare by a combustion synthesis method using metallic nitrates and glycine as reactants. By adjusting the glycine-to-nitrates ratio, the oxygen balance (OB) values of the reactant mixtures can be varied in which the combustion phenomena is altered and thereby the as-synthesized products with different characteristics are obtained. Development of crystalline phases in the as-synthesized powders after heat-treatments at various temperatures was monitored by X-ray diffraction. Nearly single-phased SrFe12O19 could be obtained after calcination of the as-synthesized Sr-ferrite powder at a temperature ≧ 900℃ for 1 h, whereas single-phased SrTiO3 could be formed directly after the combustion reaction without calcination at the same OB value. Associated with he experimental results, possible reasons were proposed to explain why the formation of perovkskite-structured SrTiO3 was more readily than that of M-type SrFe12O19 belonging to hexagonal crystal system.
On the other hand, the hard-magnet of M-type strontium ferrite (SrFe12O19, abbreviated as Sr-M) incorporated with the high-dielectric material of strontium tiatanate (SrTiO3, shortened to STO) in the range of 0.00-0.15 molar ratio was prepared simultaneously in one step by using the combustion method performed in our previous study. The effects of SrTiO3 additive on the relative complex permittivity ( ), permeability ( ) and the behavior of microwave absorption in the frequency range of 1 MHz-1.8 GHz have been investigated. Judging from the XRD analysis, it is revealed that the products as-synthesized contained the by-products of SrCO3 and Fe2O3 in addition to the excepted phases of M-Sr and STO. However, the calcined and even the sintered products were the simple composites composed of M-Sr and STO. Adding more STO to M-Sr was demonstrated not only to improve the but also to modify the . Besides, it was found that the reflection band became broader and shifted to lower frequency with increasing STO content, but the absorption efficiency [i.e., the minimum point of dB attained] was degraded gradually.

Keywords:Combustion synthesis; Oxygen balance; Nitrates; Glycine; SrFe12O19; SrTiO3; Complex permittivity; Complex permeability

誌謝 ii
摘要 iii
ABSTRACT iv
目錄 vi
表目錄 viii
圖目錄 ix
1. 緒論 1
1.1 陶瓷氧化物 1
1.2 研究動機 3
1.3 電磁波吸收原理 4
2. 文獻回顧和研究動機 8
2.1 文獻回顧 8
2.2 鐵氧體 8
2.3 陶瓷氧化物粉末合成方法 12
2.4 燃燒合成法簡介 16
3. 實驗 17
3.1 藥品 17
3.2 分析儀器設備 17
3.3 儀器分析、檢測 18
3.4製備鍶鐵氧磁體（SrFe12O19） 20
3.5製備鈦酸鍶（SrTiO3） 21
3.6 製備含鈦酸鍶之鍶鐵氧體（SrFe12O19+ηSrTiO3） 22
3.7 試片的製作 23
4. 結果與討論 26
4.1 SrFe12O19之製備 26
4.1.1 燃燒反應之性質（SrFe12O19） 26
4.1.2 初得產物（SrFe12O19）之特性分析 35
4.1.2.1 相組成 35
4.1.2.2 形態特徵 37
4.1.2.3 電磁特性 45
4.2 SrTiO3之製備 50
4.2.1 燃燒反應之性質（SrTiO3） 50
4.2.2 初得產物（SrTiO3）之特性分析 53
4.3 SrFe12O19 ＋ηSrTiO3之製備 59
4.3.1 相組成及形態觀察 59
4.4 電磁特性量測 63
4.4.1 相對介電常數 63
4.4.2 相對導磁率 65
4.5 微波吸收特性 69
5 結論 70
參考文獻 72
論文發表 76
自傳 77

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