...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Physics >Phase constituents and magnetic properties of the CoFe_2O_4 nanoparticles prepared by polyvinylpyrrolidone (PVP)-assisted hydrothermal route
【24h】

Phase constituents and magnetic properties of the CoFe_2O_4 nanoparticles prepared by polyvinylpyrrolidone (PVP)-assisted hydrothermal route

机译：聚乙烯吡咯烷酮（PVP）辅助水热法制备CoFe_2O_4纳米粒子的相组成和磁性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this research, nanoparticles of cobalt ferrite were synthesized by a simple hydrothermal process at 190 ℃ using different treatment durations with the assistance of polyvinylpyrrolidone (PVP) surfactant. The synthesized powders were characterized using X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscope and vibration sample magnetometer techniques. The quantitative values of phase constituents and also inversion parameter of cobalt ferrite spinel structure were calculated by Rietveld method using XRD results. XRD results show formation of cobalt ferrite as the main phase in all samples and also the presence of small amounts of Co_3O_4 lateral phase in some cases. Raman spectroscopies also confirm the presence of this lateral phase. Microstructural studies represent formation of nanoparticles with a narrow particle size distribution. Magnetic measurements represent that maximum magnetization (M_(max)) values are in the range of 25-57 emu/g with changes in the hydrothermal treatment duration. Intrinsic coercivity force values (_iH_c) change from 0 to 487 Oe in different samples. The highest M_(max) value of 57 emu/g was obtained in the sample after 3 h of hydrothermal treatment with PVP addition. The _iH_c value of this sample was 35 Oe, while without PVP addition, the high M_(max) value of 60 emu/g is observed in a sample that has ~iH_c value equal to 320 Oe.
机译：在这项研究中，在聚乙烯吡咯烷酮（PVP）表面活性剂的辅助下，通过简单的水热工艺，在不同的处理时间下，于190℃合成了铁氧体钴纳米颗粒。使用X射线衍射（XRD），拉曼光谱，场发射扫描电子显微镜和振动样品磁强计技术对合成粉末进行了表征。利用X射线衍射结果通过Rietveld方法计算了钴铁氧体尖晶石结构的相成分的定量值以及反演参数。 XRD结果表明，在所有样品中均形成了钴铁氧体作为主相，在某些情况下还存在少量Co_3O_4横向相。拉曼光谱法也证实了该横向相的存在。微观结构研究表明形成了具有窄粒度分布的纳米颗粒。磁测量表明，随着水热处理时间的变化，最大磁化强度（M_（max））值在25-57 emu / g的范围内。在不同样品中，固有矫顽力值（_iH_c）从0更改为487 Oe。加入PVP的水热处理3小时后，样品的最高M_（max）值为57 emu / g。此样品的_iH_c值为35 Oe，而没有添加PVP，在〜iH_c等于320 Oe的样品中观察到了60 emu / g的高M_（max）值。

著录项

  • 来源
    《Applied Physics》 |2016年第9期|835.1-835.6|共6页
  • 作者

    M. Jalalian; S. M. Mirkazemi; S. Alamolhoda;

  • 作者单位

    School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 13114-16846, Iran;

    School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 13114-16846, Iran;

    School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 13114-16846, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号