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研究生： 施順堯
Shih, Shun-Iuo
論文名稱： 殘留SrMoO4對Sr2FeMoO6磁阻效應之影響及Sr2Fe2-xMoxO6的磁性和導電機構之研究
Effect of Residual SrMoO4 on Magnetoresistance of Sr2FeMoO6 and Studies of Magnetism and Conductive Mechanism of Sr2Fe2-xMoxO6
指導教授： 方滄澤
Fang, Tsang-Tse
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2004
畢業學年度： 92
語文別： 中文
論文頁數： 133
中文關鍵詞： 磁阻 、導電性 、磁性
外文關鍵詞： magnetism, magnetoresistance, conductivity
相關次數： 點閱：89  下載：2 
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    • 　　本研究以不同比例的SrFeO2.97與SrMoO4作為固態反應法之前導粉末合成Sr2FeMoO6。在SrFeO2.97：SrMoO4=0.9：1及0.8：1的Sr2FeMoO6試片中，觀察到殘留SrMoO4相的存在。然而，我們發現在含有殘留SrMoO4相的Sr2FeMoO6試片中有較高的電阻率及較低的飽和磁化量，但卻擁有較高的低場磁阻效應（LFMR）。且發現殘留SrMoO4相是以類似非晶質型態的nano-sized cluster存在於晶粒中而非在晶界處。此外，我們也在含有殘留SrMoO4相的Sr2FeMoO6試片中觀察到anti-phase boundaries（APB）的存在。提昇電阻率及LFMR的可能機制，可被歸咎於在APB的自旋相依電子散射（spin-dependent scattering）所引起。
    　　在探討Sr2Fe2-xMoxO6磁性及導電機構方面，隨著Mo添加量的增加，Fe3+-O2--Mo5+反鐵磁偶也相對的增加，因而其飽和磁化量也越大。而電性則由於Fe3+-O2--Mo5+傳導帶的混成軌域之增加，因此導電性也隨之而提昇了。此外，藉由Mott的可變程跳躍（VRH ）傳導理論可以合理的解釋Sr2Fe2-xMoxO6在低溫時的電性傳導機制，而在高溫則是符合熱激活化之小極化子跳躍（SPH）傳導機制。

    　　In this study, different ratios of the precursor phases of SrFeO2.97 and SrMoO4 were used to prepare Sr2FeMoO6 by a solid-state reaction technique. The residual SrMoO4 was observed to exist in the samples with SrFeO2.97/ SrMoO4 ratio of 0.9 : 1 and 0.8：1. It was found that the sample with a residual SrMoO4 phase had higher resistivity, lower magnetization, but higher low field magnetoresistance (LFMR). It was found that nano-sized amorphous-like clusters of SrMoO4 phase were located inside the grains rather than at grain boundaries. Besides, anti-phase boundaries (APB) were observed in all samples of Sr2FeMoO6 with residual SrMoO4 phase. The possible mechanism for the conduction and LFMR of Sr2FeMoO6 is attributed to spin-dependent scattering at the unusual APB.
    　　The study of magnetism and conductive mechanism of Sr2Fe2-xMoxO6, with doping content of Mo increase, thus leading to antiferromagnetic coupling increase, and consequentially enhance the saturation magnetization. The linkage of Fe3+-O2--Mo5+ which leads to the formation of a narrow band results in enhancing the conductivity. Furthermore, the low temperature conductivity can be explained away by Mott’s variable range hopping (VRH) mechanism while the high temperature conductivity is contributed to the thermally activated small polaron hopping (SPH) mechanism.

    中文摘要........................................Ⅰ 英文摘要…......................................Ⅱ 目錄.............................................i 圖目錄...........................................v 表目錄..........................................xi 第一章 緒論......................................1 1-1 前言........................................1 1-2 研究動機與目的..............................3 第二章 理論基礎與文獻回顧........................4 2-1 磁性理論....................................4 2-1-1 磁性起源..................................4 2-1-2 磁性物質的分類............................5 2-1-3 超交換交互作用...........................11 2-2 磁阻簡介...................................15 2-2-1 磁阻的定義...............................16 2-2-2 磁阻的種類...............................16 2-2-3 磁阻材料的應用...........................24 2-3 鈣鈦礦結構.................................27 2-4 SrFeO3-x結構...............................31 2-5 Sr2FeMoO6簡介..............................35 2-5-1 Sr2FeMoO6之半金屬特性....................40 2-5-2 Sr2FeMoO6結構中B位置之有序無序排列.......45 2-5-3 Sr2FeMoO6之低場磁阻效應..................55 2-6 可變程跳躍模型.............................58 第三章 實驗方法與步驟...........................61 3-1 實驗藥品...................................61 3-2 實驗流程...................................62 3-2-1 探討殘留SrMoO4對Sr2FeMoO6磁阻效應等性質的影響之實驗流程....................................62 3-2-2 探討Sr2Fe2-xMoxO6磁性及導電機構之實驗流程.63 3-3 試片準備...................................64 3-3-1 SrFeO2.97粉末的合成製備..................64 3-3-2 SrMoO4粉末的合成製備.....................64 3-3-3 SrFeO2.97：SrMoO4=1：1、0.9：1、0.8：1試片之合成製備........................................64 3-3-4 Sr2Fe2-xMoxO6試片之合成製備..............65 3-4 分析與量測.................................66 3-4-1 X光繞射分析..............................66 3-4-2 磁性量測.................................66 3-4-3 電性量測.................................67 3-4-4 磁阻量測.................................69 3-4-5 TEM顯微結構觀察..........................70 第四章 結果與討論...............................74 4-1 殘留SrMoO4對Sr2FeMoO6性質之影響............74 4-1-1 XRD成份分析..............................74 4-1-2 顯微結構及成份分析.......................76 4-1-3 磁性分析.................................94 4-1-4 電性分析.................................96 4-1-5 磁阻分析.................................98 4-2 Sr2Fe2-xMoxO6磁性及導電機構之探討.........102 4-2-1 晶體結構及相成份分析....................102 4-2-2 磁性分析................................106 4-2-3 電性分析................................109 第五章 結論....................................126 參考文獻.......................................128

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