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題名 | 水熱法合成計量比之錳鋅鐵氧磁體奈米粉末特性研究=Characterization of Stoichiometric Mn-Zn Ferrite Nanopowders by Hydrothermal Synthesis |
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作者姓名(中文) | 吳玉祥; 蔡豫強; | 書刊名 | 中華科技大學學報 |
卷期 | 43 2010.04[民99.04] |
頁次 | 頁1-17 |
分類號 | 440.34 |
關鍵詞 | 水熱法; 錳鋅鐵氧磁體粉末; 礦化劑; 磁化量; Hydrothermal method; Mn-Zn ferrite powder; Meralizer; Magnetization; |
語文 | 中文(Chinese) |
中文摘要 | 本研究係以水熱法生長錳鋅鐵氧(Mn(下標 x)Zn(下標 1-x)Fe2O4)磁體奈米粉末,以氯化錳、氯化鋅、氯化鐵為起始原料,分別使用不同鹼性Na2CO3、NaOH作為礦化劑,在長晶溫度170、200℃下進行錳鋅鐵氧磁體粉末的合成,探討不同錳鋅計量比、鹼性礦化劑和溫度對於錳鋅鐵氧磁體粉末的影響。以X-ray繞射儀(XRD)、掃瞄式電子顯微鏡(SEM)、拉曼光譜儀(Raman)、超導量子磁化干涉儀(SQUID)進行粉末特性分析。XRD顯示出當礦化劑為Na2CO3弱鹼(pH 9.7)性質時,並不能促使反應完全且結晶性質不佳;但是當礦化劑為NaOH強鹼(pH 11.5)性質時,可以促使反應完全,合成出完整的尖晶石結構。隨著Mn濃度的增加,錳鋅鐵氧磁體粉末結晶性質變佳,結晶顆粒大小也隨之增加。由SEM觀察到在Na2CO3弱鹼礦化劑時,粉末呈現大範圍的團聚現象,並且結晶顆粒呈現出不規則形狀;但是在礦化劑為NaOH、水熱溫度為170℃合成Mn0.8Zn0.2Fe2O4時,可觀察到立方體的結晶顆粒,代表著強鹼礦化劑會比弱鹼礦化劑更適合來合成錳鋅鐵氧磁體粉末。由SQUID分析得知,以NaOH為礦化劑在200℃所合成的錳鋅鐵氧磁體,當x=0.8時(Mn0.8Zn0.2Fe2O4)呈現出最佳的磁化量,隨著Mn濃度的提升,磁化量也相對的提升,因此Mn離子是錳鋅鐵氧磁體磁性的重要關鍵因素。 |
英文摘要 | This work uses hydrothermal method to grow up Mn(subscript x)Zn(subscript 1-x)Fe2O4 magnetic nanopowders. At first, MnCl2, ZnCl2, FeCl3 as the raw materials and mineralizer Na2CO3, NaOH are put into the autoclave at 170 and 200℃with high pressure. The Mn-Zn ferrites are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and SQUID. The XRD results show that the synthesized ferrites with mineralizer Na2CO3 can not have a completed reaction and crystalline. Nevertheless, the mineralizer is NaOH that can make a great reaction and show spinel structure. Mn(subscript x)Zn(subscript 1-x)Fe2O4 magnetic nanopowders show good crystalline and bigger grain size with the Mn(superscript +2) concentration increasing. The powders morphology can be observed by the SEM that show aggromeration and abnormal grain phenomenon with the mineralizer Na2CO3. Moreover, the cubic grain can be obtained with NaOH, 170℃ with Mn0.8Zn0.2Fe2O4. From SQUID results, Mn0.8Zn0.2Fe2O4 (x=0.8) reveals the best magnetization with the mineralizer NaOH. The magnetization increases with the Mn(superscript +2) concentration increasing. The Mn(superscript +2) ion is the key point to affect the Mn-Zn ferrites magnetic quality. |
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