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首页> 外文学位 >Size and shape controlled synthesis and superparamagnetic properties of spinel ferrites nanocrystals.
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Size and shape controlled synthesis and superparamagnetic properties of spinel ferrites nanocrystals.

机译：尖晶石铁氧体纳米晶体的尺寸和形状控制的合成及其超顺磁性。

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摘要

The correlationship between magnetic properties and magnetic couplings is established through the investigations of various cubic spinel ferrite nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin-orbital coupling, magnetocrystalline anisotropy, exchange coupling, shape and surface anisotropy upon superparamagnetic properties of spinel ferrite nanocrystals. A general synthetic method is developed for size and shape control of metal oxide nanocrystals. The size and shape dependent superparamagnetic properties are discussed. The relationship between spin-orbital coupling and magnetocrystalline anisotropy is studied comparatively on variable sizes of spherical CoFe2O4 and Fe3 O4 nanocrystals. It also addresses the effect of exchange coupling between magnetic hard phase and soft phase upon magnetic properties in core shell structured spinel ferrite nanocrystals. The role of anisotropic shapes of nanocrystals upon self assembled orientation ordered superstructures are investigated. The effect of thermal stability of molecular precursors upon size controlled synthesis of MnFe2O4 nanocrystals and the size dependent superparamagnetic properties are described.
机译：通过研究各种立方尖晶石铁氧体纳米晶体，建立了磁性能和磁耦合之间的相关性。通过系统研究自旋-轨道耦合，磁晶各向异性，交换耦合，形状的影响，本论文的结果有助于了解各种尖晶石铁氧体和核壳结构纳米晶体的尺寸和形状控制合成以及尖晶石铁氧体中的纳米磁性。和表面各向异性对尖晶石铁氧体纳米晶体超顺磁性能的影响。开发了用于控制金属氧化物纳米晶体的尺寸和形状的通用合成方法。讨论了尺寸和形状相关的超顺磁性。在球形CoFe2O4和Fe3 O4纳米晶体的可变尺寸上，比较研究了自旋-轨道耦合与磁晶各向异性之间的关系。它还解决了硬壳相和尖晶石相之间交换交换对核壳结构尖晶石铁氧体纳米晶体中磁性能的影响。研究了纳米晶体的各向异性形状在自组装取向有序超结构上的作用。描述了分子前体的热稳定性对MnFe2O4纳米晶体尺寸控制合成的影响以及尺寸相关的超顺磁性。

著录项

  • 作者

    Song, Qing.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Chemistry Inorganic.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 236 p.
  • 总页数 236
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无机化学;
  • 关键词

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