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研究生:張正武
研究生(外文):Cheng Wu Chang
論文名稱:FePt及FePtB奈米晶薄帶磁性、相變化與交換藕合效應之研究
指導教授:張文成張文成引用關係
指導教授(外文):W. C. Chang
學位類別:碩士
校院名稱:國立中正大學
系所名稱:物理系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
中文關鍵詞:薄帶FePtFePtB
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本實驗選擇以Fe-Pt合金系作為研究主體,利用銅輪熔融旋淬法製成奈米晶薄帶,探討不同配比之Fe-Pt合金薄帶對其磁性質、相變化及矯頑機制之影響。於FexPt100-x (x = 50-70)之合金薄帶中發現。隨著Fe含量的增加,飽和磁化量有上升而本質矯頑磁力下降的趨勢,而序化相γ1-FePt與非序化相γ-FePt之居禮溫度亦有隨之下降的現象。此二元FePt系列合金薄帶之最佳磁性出現於成份為Fe50Pt50,其磁性僅有iHc = 2.1 kOe及σr = 32.3 emu/g。
在(FeyPt1-y)82B18 (y = 0.5-0.7)系列薄帶中,發現B之添加不僅會形成FexBy相,且有助於細化晶粒,使得交換藕合效應增強,提高整體磁性質。隨著Fe含量的增加,飽和磁化量有上升以及本質矯頑磁力先升後降的現象。最佳磁性出現於成份為(Fe0.675Pt0.325)82B18,其磁性質為Br = 8.9 kG,iHc = 8.2 kOe,(BH)max = 13.2 MGOe。
最後,進一步改變B的添加量於Fe67.5Pt32.5合金薄帶中,探討B含量的改變對Fe-Pt合金薄帶之影響。最佳磁性出現於成份為(Fe0.675Pt0.325)84B16之合金薄帶,其磁性為Br = 9.4 kG,iHc = 7.5 kOe,(BH)max = 14 MGOe,且角形比值(σr/σ12kOe)高達0.86,此結果為FePtB奈米晶薄帶迄今所發表過磁性最高紀錄者。
Magnetic properties, phase evolution, and exchange coupling effect of FePt and FePtB nanocomposite ribbons have been investigated in this thesis. The nanocomposites of FexPt100-x, (FeyPt1-y)82B18, and (Fe67.5Pt32.5)100-zBz alloy ribbons were prepared by melt-spinning method. With increasing Fe content, the sauturation magnetization increased, on the contrary, coercivity and the Curie temperature of ordered -FePt phase and disordered -FePt phase decreased in binary FexPt100-x (x = 50-70) alloy ribbons. For binary FexPt100-x series ribbons. The optimal magnetic properties of iHc = 2.1 kOe and r = 32.3 emu/g were achieved in the Fe50Pt50 ribbon.
Addition of B in the (FeyPt1-y)82B18 (y = 0.5-0.7) series ribbons not only leads to the formation of some magnetically soft ferrous boride phases, but also effectively refines grain size. Accordingly, the magnetic properties and intergranular exchange coupling effect of ribbons were enhanced. The -FePt, -FePt, and Fe2B phase were present at y = 0.5, 0.6, and 0.65 ribbons, and Fe3B was appeared for y = 0.675 and 0.7. In this series ribbons, the optimal magnetic properties of Br = 8.9 kG, iHc = 8.2 kOe, (BH)max = 13.2 MGOe were achieved in the (Fe0.675Pt0.325)82B18 ribbon.
Finally, in the (Fe67.5Pt32.5)100-zBz (y = 12-20) alloy ribbons system, the addition of sufficient boron not only promotes the  transformation but also leads to some soft phase, Fe2B and Fe3B. New record magnetic properties with Br of 9.4 kG, iHc of 7.5 kOe, and (BH)max of 14.0 MGOe have been obtained in (Fe0.675Pt0.325)84B16 alloy ribbons.
第一章 緒 論………………………………………………………..1
1-1磁性材料簡介……………………………………….……….....1
1-2稀土永磁材料的發展歷程……………………….…………6
1-3 FePt合金材料簡介……………………………………………10
1-3-1 FePt之磁性結構………………………………….........10
1-3-2 FePt之序化與非序化………………………………….13
1-3-3 FePt之發展簡介……………………………………….14
1-4 研究動機……………………………………………………....17
第二章 理論基礎………………………………………………………20
2-1 磁性的來源……………………………………………………20
2-2 磁性質分類……………………………………………………22
2-3 磁滯曲線………………………………………………………26
2-4磁異向性...…………………………………….…………28
2-4-1 磁晶異向性………………………………………….…29
2-5 合金之磁硬化機構……………………………………………31
2-6磁粒子大小對磁性質的影響………………….…….…36
2-7晶格常數之計算……...……………………………….………38
2-8 交換藕合效應…………………………………………………39
2-8-1晶粒間的交互作用……………………………………..48
2-9 熔液旋淬法製成奈米粒……………………………..…52
第三章 實驗方法………………………………………………………..53
3-1實驗流程…………………………………………………….…53
3-2 合金薄帶之製備………………………………………………54
3-2-1 合金成份配製……………………………….…………54
3-2-2 合金熔煉……………………………… ………………55
3-2-3 熔融旋淬……………… ………………….........56
3-2-4 熱處理……………………………… …………….…...61
3-3 量測與分析………………………………… …………….…..62
3-3-1 磁性量測-VSM………………………… …………..…62
3-3-2 低溫磁性量測-SQUID………………………….……..63
3-3-3 結構鑑定-XRD………………………… ……………..63
3-3-4 磁性相分析-TMA………………………………….….64
3-3-5 微結構組織觀察-TEM…………………………….…..65
第四章 實驗結果與討論………………………………………….…....66
4-1 FePt二元合金薄帶磁性與相變化之研究…………….……...66
4-1-1 FePt合金薄帶之特性……………………………….…67
4-1-2 Fe60Pt40合金薄帶之特性………………………………70
4-1-3 Fe65Pt35合金薄帶之特性………………………………74
4-1-4 Fe67.5Pt32.5合金薄帶之特性……………………………78
4-1-5 Fe70Pt30合金薄帶之特性………………………………81
4-1-6各成份合金薄帶最佳條件下之比較……………...…..84
4-2 定量B添加對FePt合金薄帶磁性及相變化之影響……….91
4-2-1 (Fe0.5Pt0.5)82B18合金薄帶之特性………………………92
4-2-2 (Fe0.6Pt0.4)82B18合金薄帶之特性………………………96
4-2-3 (Fe0.65Pt0.35)82B18合金薄帶之特性…………………....100
4-2-4 (Fe0.675Pt0.325)82B18合金薄帶之特性………………..…104
4-2-5 (Fe0.7Pt0.3)82B18合金薄帶之特性……………………...108
4-2-6 各成份合金薄帶最佳條件下之比較………………...112
4-3 B的添加量對Fe67.5Pt32.5合金薄帶磁性與相變化之影響…..123
4-3-1 (Fe0.675Pt0.325)88B12合金薄帶之特性…………… …….123
4-3-2 (Fe0.675Pt0.325)86B14合金薄帶之特性…………… …….127
4-3-3 (Fe0.675Pt0.325)84B16合金薄帶之特性………………… .131
4-3-4 (Fe0.675Pt0.325)80B20合金薄帶之特性…………… …….135
4-3-5 各成份合金薄帶最佳條件下之比較…………… …..139
4-4矯頑機制之研究………………………………………… …..148
第五章 結論……………………………………….…..........................157
第六章 參考文獻……………………………………….…..................163
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