釔鐵柘榴石與雜質的添加對於以LHPG法生長晶纖之研究

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毛之成(Tze-Chern Mao) 查詢紙本館藏

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機械工程學系

論文名稱

釔鐵柘榴石與雜質的添加對於以LHPG法生長晶纖之研究

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摘要(中)

釔鐵柘榴石材料因具有磁光法拉第旋轉特性及於近紅外光範圍有優異的穿透性，故在磁光元件上被廣泛的應用著。然而，因YIG屬於非共熔材料且其浮熔區會有非穩態性的振盪，故欲生長高品質晶體相當不易。本文以雷射加熱提拉法對YIG的晶纖生長機制作為探討，發現當其熔區成分在含鐵量高過78 mole %時可直接提拉出YIG晶纖，但若低於此含量則熔區會藉由自我調適行為，以YFeO3相的凝固與氧化鐵的排入熔區，進行改變熔區的成分改變至超過78 mole %含鐵量之後，因此時的凝固相轉為YIG，而供料也為YIG，故可達到一平衡狀況，穩定生長YIG晶纖。另外，對於雷射加熱提拉法(Laser Heating Pedstal Growth, LHPG)的方法也可採用緻密化的熔媒晶種與二階段拉晶方式可生長出特定方向的晶纖，使其長出的晶纖於應用上更為的便利。
另外，隨著新型態的設計與發展，提升YIG的磁光法拉第旋轉量可藉由摻雜的方式達成，所以在本文中，CeO2被添加至YIG材料中，企圖生長優異的Ce：YIG晶纖。然而為了生長出此成分的高品質晶纖，影響浮熔區法生長的晶纖品質的最重要兩個因素：材料棒的製成與晶纖生長時的拉速，需被逐一檢視與探討。就以固態陶瓷燒結的實驗中發現，添加CeO2後的YIG陶瓷，其燒結溫度可視其添加量適度的降低燒結溫度即可完成高緻密的陶瓷，而陶瓷的成分、微結構與磁性表現則也會因不同的添加量而有不同程度的變化。對於Ce：YIG晶纖的生長，拉晶的速度則必須視添加量的增加而逐漸減緩，主要是因為受到組成過冷的影響所致，若生長速度未適度的調降，則生長出的晶纖會較未添加的晶纖容易生成胞狀組織，並且也因為熱張力對流的影響，溶質將聚集於生長介面的中心處，導致長出胞狀組織的晶纖，在中心部分之胞狀組織也會比周圍的部分發展的更為完整。

摘要(英)

Yttrium iron garnet (Y3Fe5O12, YIG) single crystal is widely used in magneto-optical applications in fiber-optical communication systems and magnetic field sensors, both because of its large Faraday rotation and because it is highly transparent in the near-infrared region.?However, growing YIG single-crystals is difficult because of the incongruent melting of the compound and the unsteady oscillatory molten zone. In this study, YIG single-crystal fibers were grown by LHPG method. Based on the experimental results show that YIG single-crystal fibers could be directly grown at the stable freezing interface when the melt had a composition of 78 ~ 87 mole % Fe2O3. When the seed’s Fe2O3 concentration was below 78 mole %, the YFeO3 would crystallize out until the composition of the melt increased along the liquidus curve until it needed a concentration of 78 mole % Fe2O3 or higher, whereupon YIG started to crystallize from the liquid. In addition, YIG single-crystal fibers with the desired crystallographic orientation could only be obtained using a two-pass method.
CeO2 was added into YIG materials to increase the quantitative Faraday rotation of YIG. With the floating zone method, there were two essential conditions for growing a single crystal fiber of YIG: the degree of sintering of the feed rod and the growth rate. From our study, it can be seen that Ce:YIG ceramic with the necessary densification could be fabricated using a lower sintering temperature than that required for pure YIG ceramic. Moreover, the greater the amount of CeO2 added, the slower the pulling rate needed to grow good quality single crystal fibers. When a faster pulling rate is used to grow Ce:YIG material, a more significant amount of foreign phase and cellular structures will form in the core region than in the peripheral region of the grown crystal fibers.

關鍵字(中)

★ 釔鐵柘榴石

關鍵字(英)

★ YIG

論文目次

中文摘要 I
Abstract II
致謝 IV
目錄 IIV
表目錄 VII
圖目錄 VIII
符號說明 XII
第一章緒論 1
1.1 研究背景 2
1.2 材料介紹 4
1.3 相關研究 6
1.3.1 釔鐵柘榴石 6
1.3.2摻鈰釔鐵柘榴石 9
1.4 研究動機 11
1.5 研究目的 13
1.6 研究方法 14
圖表 15
第二章材料製程與實驗方法 23
2.1粉末的調配 23
2.2陶瓷材料棒的製作 24
2.3 晶纖生長 25
2.3.1 二氧化碳雷射加熱系統 26
2.3.2 光學轉換系統 26
2.3.3 長晶機台 26
2.3.4 紅外線熱影像儀 27
2.3.5 晶纖生長方式 27
2.4 晶體後續檢測 28
圖 31
第三章 YIG晶纖在LHPG系統下的生長機制 35
3.1自我調適行為 35
3.2陶瓷晶種孔隙對晶纖生長之影響 40
3.3控制YIG晶纖的生長方向 42
3.4本章結論 43
圖表 45
第四章鈰摻雜對陶瓷製程的影響 61
4.1 溫度對陶瓷燒結之影響 61
4.2 Ce:YIG陶瓷的密度與燒結溫度關係 63
4.3 Ce:YIG陶瓷的成分與微結構 64
4.4 Ce:YIG陶瓷的磁性檢測 66
4.5 本章結論 69
圖表 70
第五章鈰摻雜對晶纖生長的影響 87
5.1 YIG熔區的震盪對晶纖生長的影響 87
5.2 拉晶速度對Ce:YIG晶纖生長的影響 89
5.3 Ce:YIG晶纖生長的熔區振盪與胞狀結構的觀測 91
5.4 晶體檢測 93
5.5 本章結論 95
圖表 97
第六章總結論 113
參考文獻 115

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指導教授

陳志臣(Jyh-Chen Chen)

審核日期

2006-7-19

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