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首页> 外文期刊>RSC Advances >Crystal chemistry and single-phase synthesis of Gd3+ substituted Co–Zn ferrite nanoparticles for enhanced magnetic properties
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Crystal chemistry and single-phase synthesis of Gd3+ substituted Co–Zn ferrite nanoparticles for enhanced magnetic properties

机译：Gd3 +取代的Co-Zn铁氧体纳米粒子的晶体化学和单相合成可增强磁性能

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摘要

Rare earth (RE) ions are known to improve the magnetic interactions in spinel ferrites if they are accommodated in the lattice, whereas the formation of a secondary phase leads to the degradation of the magnetic properties of materials. Therefore, it is necessary to solubilize the RE ions in a spinel lattice to get the most benefit. In this context, this work describes the synthesis of Co–Zn ferrite nanoparticles and the Gd ~(3+) doping effect on the tuning of their magnetic properties. The modified sol–gel synthesis approach offered a facile way to synthesize ferrite nanoparticles using water as the solvent. X-ray diffraction with Rietveld refinement confirmed that both pure Co–Zn ferrite and Gd ~(3+) substituted Co–Zn ferrite maintained single-phase cubic spinel structures. Energy dispersive spectroscopy was used to determine the elemental compositions of the nanoparticles. Field and temperature dependent magnetic characteristics were measured by employing a vibration sample magnetometer in field cooled (FC)/zero field cooled (ZFC) modes. Magnetic interactions were also determined by M?ssbauer spectroscopy. The saturation magnetization and coercivity of Co–Zn ferrite were improved with the Gd ~(3+) substitution due to the Gd ~(3+) (4f ~(7) )–Fe ~(3+) (3d ~(5) ) interactions. The increase in magnetization and coercivity makes these Gd ~(3+) substituted materials applicable for use in magnetic recording media and permanent magnets.
机译：如果将稀土（RE）离子容纳在晶格中，它们会改善尖晶石型铁氧体中的磁性相互作用，而形成第二相会导致材料的磁性下降。因此，有必要使尖晶石晶格中的RE离子溶解以获得最大的益处。在这种情况下，这项工作描述了Co-Zn铁氧体纳米颗粒的合成以及Gd〜（3+）掺杂对其磁性能的调节作用。改进的溶胶-凝胶合成方法提供了一种以水为溶剂合成铁氧体纳米粒子的简便方法。用Rietveld精修进行的X射线衍射证实，纯Co-Zn铁氧体和Gd〜（3+）取代的Co-Zn铁氧体均保持单相立方尖晶石结构。能量色散光谱法用于确定纳米颗粒的元素组成。通过采用场致冷（FC）/零场致冷（ZFC）模式的振动样品磁力计来测量场和温度相关的磁特性。磁性相互作用也通过Msssbauer光谱法确定。由于Gd〜（3+）（4f〜（7））-Fe〜（3+）（3d〜（5），随着Gd〜（3+）的取代，Co-Zn铁氧体的饱和磁化强度和矫顽力提高。 ）的互动。磁化强度和矫顽力的提高使得这些Gd〜（3+）替代材料适用于磁记录介质和永磁体。

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