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頁籤選單縮合
題名 | Preparation of Metal Substituted Hexagonal Barium Ferrite with Organic Precipitant Method=有機沈澱劑法研製含金屬取代之鋇鐵氧磁體 |
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作者 | 張富昌; 陳榮森; | 書刊名 | 材料科學 |
卷期 | 25:2 1993.06[民82.06] |
頁次 | 頁84-94 |
分類號 | 440.35 |
關鍵詞 | 沈澱劑法; 金屬; 鋇鐵氧磁體; |
語文 | 英文(English) |
中文摘要 | 建立-製備BaTixCoxFe�詁�-�矩O���e體的新方法中,以 8-Hydroxyquinoline(oxine)作為鈦、鈷、鐵及鋇等離子之有機沉澱劑,同時加入0.2M 草酸根以確保鋇離子之完全沉澱。OXine與鐵在溶液中之濃度比為0.8:1.0,pH為 9.4。本法使沉澱物易於沉澱及過濾,其粒徑可由氨水加入的速率控制,所得之 沉澱物用化學分析法及熱分析法觀察不同溫度下之分解現象。 沉澱物燒結後之粉體用X-射線繞射儀及掃描式電子顯微鏡鑑定,並用以推論形成 六角形鋇鐵氧磁體之反應機制。二價鐵的氧化為其主要的速率控制步驟,粉體密 度隨鍛燒溫度及時間而改變。 |
英文摘要 | A new method for the preparation of BaTixCoxFe�詁�-�矩O���e) powder was developed. 8-Hydroxyquinoline (oxine) was used as an organic precipitant for Ti, Co, Fe and Ba, and oxalic acid was added to assure the complete precipitation of barium ions.The optimum precipitation conditions were obtained at pH 9.4 containing an oxine :Fe ratio of 0.8:1.0 in the presence of 0.2M oxalate or 0.1M carbonate. The precipitant is free from alkaliions and easy for sedimentation and filtration. The particle size can be controlled by the flow rate of NH�淋H during the precipitation step. The chemical composition of the precipitate was characterized by chemical analysis and thermal analysis. The characterization of calcined powder was evaluated with x-ray diffraction spectrometer and scanning electron microscopy. The formation mechanisms of hexagonal barium ferrite were investigated. The rate controlling step for the complete formation of barium ferrite is the oxidation of the Fe��* ions. Density is proportional to the temperature and time of calcination. |
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