研究生: |
許彩珍 Tsai-Jen Shiu |
---|---|
論文名稱: |
製備經摻雜奈米粒子與其特性研究 Preparation and Characterization of Doped Nanocrystal Materials |
指導教授: |
蘇雲良
Yun-Liang Soo |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 49 |
中文關鍵詞: | 氧化鋯 、氧化鉿 |
相關次數: | 點閱:2 下載:0 |
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本論文以”非水解溶凝膠法”製備摻雜與非摻雜Co、Ni原子之ZrO2與HfO2奈米粒子,欲研究可能出現於材料中的物理現象。於”非水解溶凝膠法”製備出的奈米粒子,在室溫下以X光繞射分析出具有一定程度的晶性,其大小以謝樂方程與穿透式電子顯微鏡觀測估計平均粒子直徑約為5nm以下,但此些粒子形狀多為不規則狀。各樣品間能隙上的變化也反應其組成物與結構上的不同。於磁性方面,未摻雜其他元素的ZrO2與HfO2粒子表現微弱的反磁性,而一旦摻雜入過度金屬Ni、Co,順磁性便超越原本的反磁性質,並於溫度40K下經摻雜後的奈米粒子皆無發現鐵磁性存在。
“Nonhydrolytic Sol-Gel Synthesis Method” is adopted to prepare not only ZrO2 and HfO2 but also Co-doped and Ni-doped ZrO2、HfO2 nanoparticles in this paper﹒It can be found that Zr compounds are well-crystallized and average particle size is estimated below 5 nm﹒Hf compounds are bad-crystallized and appearance of particles reveals nonhomogeneity﹒It may be attribute to the factor in experimental conditions like temperature or pressure﹒Otherwise,ZrO2 and HfO2 particles reveal diamagnetism,but Co-doped and Ni-doped ZrO2、HfO2 particles are paramagnetic﹒Ferromagnetism is not detected in all kind of particles at 40K﹒
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