English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 49521/84657 (58%)
造访人次 : 7592824      在线人数 : 86
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻

    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/92098

    题名: BaFe12O19 powder with high magnetization prepared by acetone-aided coprecipitation
    作者: Yu, Hsuan-fu
    贡献者: 淡江大學化學工程與材料工程學系
    关键词: Barium hexaferrite;Coprecipitation;Magnetic property;Magnetization;Hard magnets
    日期: 2013-09-01
    上传时间: 2013-08-29 10:26:31 (UTC+8)
    出版者: Amsterdam: Elsevier B.V.
    摘要: BaFe12O19 particles with high magnetization were produced using an acetone-aided coprecipitation process. An aqueous solution of iron and barium nitrates, in an Fe3+/Ba2+ molar ratio of 12, was added in a stirred precipitation liquid medium composed of H2O, CH3(CO)CH3 and NH4OH. After reacting metallic ions with ammonia, the precipitates were formed, centrifugally filtered, freezing-dried and calcined. Effects of amount of the acetone in the precipitation liquid medium on the formation of crystalline BaFe12O19 were investigated. The presence of acetone in the precipitation liquid medium can greatly promote formation of the crystalline BaFe12O19 at temperature as low as 650 oC and can enhance magnetization of the derived particles. On the other hand, raising the calcination temperature can effectively accelerate development in crystallite morphology and magnetic characters of the barium hexaferrites. While the barium hexaferrite powder obtained without acetone additions and calcined at 1000 oC had magnetization (measured at 50 kOe; M(50 kOe)) of 63.5 emu/g, remanence magnetization (Mr) of 31.3 emu/g and coercivity (Hc) of 4.7 kOe, the single magnetic domain sizes BaFe12O19 powder with M(50 kOe) of 70.6 emu/g, Mr of 34.4 emu/g and Hc of 3.7 kOe was produced at 1000 oC, using a precipitation liquid medium of 64 Vol.% acetone.
    關聯: Journal of Magnetism and Magnetic Materials 341, pp.79-85
    DOI: 10.1016/j.jmmm.2013.04.030
    显示于类别:[化學工程與材料工程學系暨研究所] 期刊論文


    档案 描述 大小格式浏览次数
    29-2013-9-JMMM Vol314 (Sept 2013)-BaFe12O19 powderwithhighmagnetizationprepared byacetone-aidedcoprecipitation.pdf1049KbAdobe PDF837检视/开启



    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈