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La-Ca-Co-Zn 掺杂M型锶铁氧体的相变过程和磁性能研究
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1.四川大学材料科学与工程学院;2.成都锦钛精工有限公司;3.西南石油大学石油天然气工程

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国家科技攻关计划


The phase transformation and magnetic properties of La-Ca-Co-Zn doped M-type hexaferrites
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Affiliation:

1.College of Materials Science and Engineering , Sichuan University;2.Oil and Natural Gas Engineering , Southwest Petroleum University

Fund Project:

The National Key Technologies R&D Program of China

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    摘要:

    采用陶瓷法制备La-Ca-Co-Zn 掺杂的M型锶铁氧体Sr0.3La0.3Ca0.4Fe10.625Co0.225Zn0.1O19。使用高温X射线衍射仪、振动样品磁强计、热分析、和扫描电子显微镜等对Sr0.3La0.3Ca0.4Fe10.625Co0.225Zn0.1O19 在25°C 到1450°C的相变过程进行了分析,并且讨论了其磁性能。实验结果表明:La-Ca-Co-Zn 掺杂的M型六方铁氧体的形成主要分为两个部分,在大概700℃左右,SrCO3 和Fe2O3先反应生成中间相Sr3Fe2O7-d,然后Sr3Fe2O7-d再和剩下的Fe2O3反应生成M相,并且Sr3Fe2O7-d中的Fe离子化合价与温度有关;随着温度升高,La3+, Ca2+, Co2+ 和 Zn2+开始逐渐溶入中间相或者随后生成的M相中,且在M相中分布均匀;和高温射线衍射仪检测结果不同的是在700℃左右退火时,得到了钙钛矿相;在1200℃烧结,可以得到单一程度很高的M相,但有少量的第二相存在,第二相的存在有利于提高烧结致密度;当烧结温度为1380℃时,铁氧体开始分解;Sr0.3La0.3Ca0.4Fe10.625Co0.225Zn0.1O19 铁氧体粉末退磁曲线的矩形度要低于SrFeO12的退磁曲线矩形度。

    Abstract:

    The phase?transformation process form 25°C to 1450°C and magnetic properties of Sr0.3La0.3Ca0.4Fe10.625Co0.225Zn0.1O19 were investigated by means of high-temperature X-ray diffraction, thermal analysis, vibrating sample magnetometer and scanning electron microscopy. The formation of M-type hexagonal ferrites in air passes through two endothermal reactions. SrCO3 and partial Fe2O3 first generated the intermediate phase Sr3Fe2O7-d in around 700°C. And then Sr3Fe2O7-d and the remaining unreacted Fe2O3 generated SrFe12O19. Meanwhile, La3+, Ca2+, Co2+ and Zn2+ ions gradually dissolve in the intermediate phase or the late product M phase with the temperature increases. The perovskite was obtained when annealed at about 700°C, which may transform perovskite into Sr3Fe2O7-d during the cooling process. The average valence of Fe in Sr3Fe2O7-d was a function of temperature. A very high single degree of M phase and a small number of second phase were obtained at about 1200°C, and the cationic were evenly distributed in the crystal. The rectangularity of the demagnetizing curves of the LaCaCoZn-type substituted ferrite powder decreases compared to that of unsubstituted ferrite powder. The ferrite will be decomposed at about 1380°C.

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安健樟,叶金文,唐正华,陈亦可,秦尧. La-Ca-Co-Zn 掺杂M型锶铁氧体的相变过程和磁性能研究[J].稀有金属材料与工程,2019,48(8):2447~2453.[An Jianzhang, Jingwen Ye, Zhenghua Tang, Yike Chen, Yao Qin. The phase transformation and magnetic properties of La-Ca-Co-Zn doped M-type hexaferrites[J]. Rare Metal Materials and Engineering,2019,48(8):2447~2453.]
DOI:10.12442/j. issn.1002-185X.20180158

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  • 收稿日期:2018-02-14
  • 最后修改日期:2018-04-19
  • 录用日期:2018-04-26
  • 在线发布日期: 2019-09-05
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