雷射加熱基座提拉法生長摻鈰之釔鐵柘榴石晶纖; LHPG method grow Ce:YIG crystal fibrous

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/2574

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/2574

Title:	雷射加熱基座提拉法生長摻鈰之釔鐵柘榴石晶纖;LHPG method grow Ce:YIG crystal fibrous
Authors:	卓于文;Yu-Wen Tso
Contributors:	機械工程研究所
Keywords:	鈰;雷射加熱基座提拉法;釔鐵柘榴石;LHPG;YIG;Ce
Date:	2005-07-08
Issue Date:	2009-09-21 11:50:51 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	YIG材料因具有特殊的磁光法拉第旋轉特性，故在磁光元件上的應用相當廣泛，但在現今高規格的需求下，此材料的特性已不敷使用，因此，諸多學者專家藉由摻雜各種元素來提升其性質，並發現到以摻雜鈰離子對YIG的磁光法拉第旋轉之增加最有幫助，因此，本文主要在探討以雷射加熱提拉法生長摻鈰之釔鐵柘榴石的研究。本文內容是以靜態熔解推展到實際長晶來做探討。而從靜態熔解實驗所觀察到的熔區之各種變化情形，我們合理地推測Ce的摻雜可能會導致熔區的普朗特數上升，且震盪頻率會隨著Ce的摻雜而減緩，此外，Ce的摻雜亦會影響到熔區中下固液介面溫度梯度的下降。而在實際長晶方面，從我們所做出的實驗結果發現在本研究中鈰離子於YIG中的極限摻雜量約為x=0.2左右，此外，我們發現隨著提拉速度的降低，晶體的品質也就越好，而根據實驗的結果我們歸納出鈰摻雜量的增加，長晶時所能使用的臨界提拉速度就越低，因此，若欲獲得良好的Ce：YIG晶體就需要放慢拉速生長。 Yttrium iron garnet (YIG) exhibits a large Faraday Effect in the near-infrared region, thus it has been widely applied as a magneto-optical Faraday element. With the development in technology, new materials were investigated for replacing YIG since it’s not enough magnitude of Faraday rotation to satisfy a device desired. Much research on cerium-substituted YIG had been reported with respect to the greatly larger Faraday effect than other materials. Consequently, Ce:YIG material is a much more promising material for magneto-optical devices. In this study, we found that the influence of the addition CeO2 on the growth of YIG single crystals fibrous by LHPG method. Based on the experimental results, the addition of CeO2 into YIG caused the variation of flow properties of the molten zone, such as Prandtl number, the temperature gradient of the solid-liquid interface and the strength of oscillatory thermocapillary flow. Therefore, we have to suitability vary pulling rate to grow good quality of Ce:YIG single crystal fibrous. We see that the more Ce-doped content in YIG single crystal fibrous, the slower the pulling rate.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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