研究生: |
許仁和 Jen-Ho Hsu |
---|---|
論文名稱: |
鐵鉑釕奈米顆粒合成與性質研究 Synthesis and property studies of FexPt(1-x-y)Ruy nanoparticles |
指導教授: |
李志浩
Chih-Hao Lee |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 78 |
中文關鍵詞: | 鐵鉑 、釕 、EXAFS |
相關次數: | 點閱:1 下載:0 |
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具有自組裝行為的鐵鉑奈米顆粒由於具有高磁異向性常數,被視為未來磁儲存媒體的潛力材料之一。近年來在鐵鉑奈米顆粒中添加第三合金元素的研究相當多,包括銀、金、鈷、鈀等…
而本篇論文中主要是探討在鐵鉑奈米顆粒中添加-釕-原子對其序化溫度的影響。而在合成過程中,為了避免在FePt先核之前,PtRu就先成核而得到非預期的結構,所以我們改變了第三元素加入反應的溫度。而從XRD以EDX的圖譜中可以發現,我們已成功的合成出Fe50Ru3Pt47奈米顆粒。從NEXAS可以發現隨著退火溫度上升,其結構漸漸由FCC轉變為序化的L10結構。會而Fe50Ru3Pt47奈米顆粒的序化溫度為600℃,由低溫及室溫SQUID的磁滯曲線表現為鐵磁性行為。
Self-assembly FePt nanoparticles with extremely high magnetic anisotropy were predicted as one of the best materials for high-density storage hard disk in future. Recently FePtM (M=Cu, Ag, Au, Co, Pd, Mn ) nanoparticles were synthesized to investigate the effects of the third element addition.
A series of FexRuyPt(1-x-y) nanoparticles was chemically synthesized in order to investigate the effect on magnetic transition temperature in the alloy system. We expect that by adding ruthenium into FePt system could reduce the ordering temperature and enhance its coercivity after annealing. We injected the third element source at different reaction temperatures in order to avoid the nucleation of Pt-Ru seeds before the nucleation of Fe-Pt ones. From the XRD and EDX spectrum, Fe50Ru3Pt47 nanoparticles was synthesized successfully by adding third element source at 160℃, and the ordering temperature is at 600℃. It shows ferromagnetic measured by SQUID at 5K/room temperature.
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