水熱法中利用溶劑控制生長奈米尺度鈦酸鋇粉體之研究

Hydrothermal Synthesis Nano-Size BaTiO3 Used Solvent to Control Crystal Growth

陳建淳(Jian-Chuen Chen)

指導教授 ： 王錫福

共同指導教授 ： 盧俊安(Chun-An Lu)

國立臺北科技大學/工程學院/材料科學與工程研究所/博士(2014年)

https://doi.org/10.6841/NTUT.2014.00170

摘要

本研究藉由改變甲醇、乙醇、正丙醇、異丙醇、第三丁醇與水的比例於水熱合成法製備陶瓷粉體時，達到BaTiO3的粒徑控制，並將所製備之不同粒徑BaTiO3粉體進行X-Ray繞射儀、掃描電子顯微鏡、拉曼光譜分析儀等各項檢測。分析結果顯示BaTiO3粒徑尺度分佈範圍、結構隨粒徑尺度縮小所產生之非熱活化型相變化、晶格內部之氫氧根缺陷以及缺陷所造成的晶格常數變化，本研究驗證奈米尺度之BaTiO3在常溫條件下，由正方晶結構相變化成高溫穩定之立方晶結構，OH-導致立方晶系之BaTiO3其晶格常數會略大於理論值，進而利用拉曼光譜分析可觀察BaTiO3晶體內部有應力產生，而內部應力會隨BaTiO3粒徑縮小而增加，而拉曼光譜也顯示 BaTiO3內部有氫氧根缺陷之存在，因此推斷內部應力與氫氧根缺陷有關，另外研究也顯示使用一元醇做為用機溶劑有助於合成之BaTiO3粒徑分佈愈均勻及晶軸比之提升。

關鍵字

BaTiO3 ； 水熱合成法 ； 正方晶結構

並列摘要

In this study, the particle size of barium titanate was controlled by different concentration of methanol, ethanol, propa-1-ol, isopropanol and tret-butanol under hydrothermal condition. Experiences results showed by several analysis, using X-Ray diffractometer analyzed the barium titanate crystal phase, and scanning electron microscopy observed the microstructure for particle morphology, and Raman spectroscopy analyzed the residual TiO2 、lattice stress and OH- defects. Other results included particle size distribution, phase transformation of non-thermal activation and internal defects and lattice constant variation. The results showed that tetragonal structure transformed to cubic structure against nano particle size. And the OH- defects of structure caused the lattice constant larger than theoretical value slightly. For the results showed the barium titanate crystal had internal stress for OH- defects induced. The results showed the stress of crystal lattice increased with decreased particle size. The two important results of uniform particle size distribution and crystal type obtained by using alcohol as part of solvent to form nano size barium titanate in hydrothermal synthesis.

並列關鍵字

BaTiO3 ； Hydrothermal ； Tetragonal

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