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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Enhancement in the magnetic, optical and electrical properties of Ti_ (0.97)Co_ (0.03)O_ 2 and Ti_ (0.97)Fe_ (0.03)O_ 2 nanoparticles with Ce co-doping
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Enhancement in the magnetic, optical and electrical properties of Ti_ (0.97)Co_ (0.03)O_ 2 and Ti_ (0.97)Fe_ (0.03)O_ 2 nanoparticles with Ce co-doping

机译：Ce共掺杂增强Ti_（0.97）Co_（0.03）O_2和Ti_（0.97）Fe_（0.03）O_2纳米粒子的磁，光学和电性能

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Ti_ (0.97)Co_ (0.03)O 2 (TC3), Ti_ (0.93)Co_ (0.03)Ce_ (0.04)O_ 2 (TCC34), Ti_ (0.97)Fe_ (0.03)O_ 2 (TF3) and Ti_ (0.93)Fe_ (0.03)Ce_ (0.04)O_ 2 (TFC34) nanoparticles were prepared by a chemical route. The x-ray diffraction pattern shows the coexistence of anatase and rutile phases and the value of the average particle size is measured using the Scherrer relation. The images from transmission electron microscopy show that the average particle size is 24, 27, 28 and 30nm, respectively, for TC3, TCC34, TF3 and TFC34 and they are also represented by a particle distribution histogram. Fourier transform infrared spectroscopy has been used to confirm the stretching of Ce with the CoOTi and FeOTi bond. Magnetic measurements detect ferromagnetism in all samples with the saturation magnetization increasing abruptly with Ce co-doping. All the samples show large photocatalytic activity and co-doping of Ce exhibits large-scale photocatalytic activity, and the value of the resulting band gap is calculated. This effect is due to the insertion of Ce~ (3+/4+) in the TiO_ 2 matrix, which generates an n-type impurity band. The dielectric behaviour is explained by the interface polarization, the decreasing trend of dielectric permittivity with increasing frequency by a MaxwellWagner and Koops' theory and is constant up to higher frequency regions due to the nano size effect. The dielectric behaviour is also explained by measuring frequency dependent ac conductivity.
机译：Ti_（0.97）Co_（0.03）O 2（TC3），Ti_（0.93）Co_（0.03）Ce_（0.04）O_2（TCC34），Ti_（0.97）Fe_（0.03）O_2（TF3）和Ti_（0.93）通过化学路线制备Fe（0.03）Ce_（0.04）O_2（TFC34）纳米颗粒。 X射线衍射图显示了锐钛矿相和金红石相的共存，并且使用谢勒（Scherrer）关系测量平均粒径的值。透射电子显微镜的图像显示，TC3，TCC34，TF3和TFC34的平均粒径分别为24、27、28和30nm，它们也由粒径分布直方图表示。傅里叶变换红外光谱已用于确认具有CoOTi和FeOTi键的Ce的拉伸。磁测量可检测所有样品中的铁磁性，并且随着Ce共掺杂，饱和磁化强度突然增加。所有样品均显示出大的光催化活性，并且Ce的共掺杂显示出大规模的光催化活性，并且计算所得带隙的值。该效应归因于Ce_2（3 + / 4 +）在TiO_2基体中的插入，从而生成n型杂质带。介电特性由界面极化，介电常数随频率的增加而下降的趋势（由麦克斯韦·瓦格纳和库普斯理论）解释，并且由于纳米尺寸效应而在较高频率区域内保持恒定。介电性能也可以通过测量频率相关的交流电导率来解释。

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