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標題: 鋁摻雜鐵矽粉末於氮氫混合氣氛熱處理後之特性分析
Characterization of Al-doped FeSi2 Powders Annealed in Forming Gas
作者: 李忠明
Li, Chung-Ming
關鍵字: Thermoelectric
出版社: 材料工程學系所
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摘要: 本研究以真空電弧熔煉法製備摻雜 Al 元素於 FeSi2 中,並在還原氣氛下對研磨成粉體的 p 型 FeSi2 進行還原熱處理,使材料相變化為具有半導體性質之β相結構。本研究分別以傅立葉轉換紅外光譜儀、感應耦合電漿質譜分析儀、元素分析儀、X光繞射儀、拉曼光譜儀、粒徑分析儀及場發射掃描式電子顯微鏡等分析儀器,觀察FeSi1.985 Al0.015之成份、結構以及粒徑尺寸等性質,探討不同熱處理溫度與持溫時間對FeSi1.985 Al0.015的成份變化及相變化趨勢的影響。 由FTIR及氧分壓的結果顯示,試片中有SiO2的生成。在EA及ICP-MS的分析中發現,於還原氣氛下熱處理一定時間內能降低雜質,但更長時間的熱處理會使得試片發生氧化以及Al的散失。XRD及Raman的結構分析方面,發現熔煉後的試片內含α及ε相。隨著熱處理之後,試片即轉變為以β相為主的結構。由PCS及FE-SEM中,可得知球磨後的試片呈現機械互鎖的狀態,使得顆粒有團聚的現象。且平均粒徑的變化與XRD中相變化的趨勢一致。
In this study, Al-doped FeSi2 compounds were prepared by using vacuum arc remelting and ball-milling. The p-type FeSi2 compounds were ground into powder, then annealed in forming gas for various times and temperatures to transform into the semiconducting β phase. The composition, structure and particle size properties were characterized by means of inductively coupled plasma-mass spectrometer (ICP-MS), elemental analyzer (EA), X-ray diffractometer (XRD), Raman spectroscopy, Fourier transformation infrared spectroscopy (FTIR), photon correlation spectroscopy (PCS) and field-emission SEM (FE-SEM), respectively. As shown by FTIR, SiO2 formed in agreement with the theoretical prediction. The results in EA and ICP-MS show that annealing in forming gas can reduce the impurity in the powders. However, longer heat treatments cause oxidation and Al loss. From XRD and Raman analyses, the as-prepared samples contain only the α and ε phase. After annealing, the samples transform into the β phase. The PCS and FE-SEM results show that the as-prepared powder exhibit aggregation due to mechanical interlocking. The change of average particle size corresponds to the phase transformation observed in XRD.
Appears in Collections:材料科學與工程學系



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