ZnO以及Fe掺杂ZnO的光学性质和室温铁磁性研究

Optical and Room-temperature Ferromagnetic Properties of ZnO and Fe Doped ZnO

采用共沉淀法制备出不同掺杂浓度的Zn1-xFexO(0.00≤x≤0.10)粉末样品,研究掺杂浓度的不同对其结构、光学性质以及室温铁磁性的影响。采用X射线衍射仪、红外光谱仪、紫外-可见分光光度计、荧光光谱仪、振动样品磁强计对样品的结构、光学性质和磁性进行测试分析。结果表明:所有Zn1-xFexO样品都具有单一六方纤锌矿结构,没有出现第二相杂质。对紫外波段吸收率高达95%,掺Fe后可见光波段的吸收率与纯ZnO相比有明显提高,掺杂使得带隙宽度Eg由纯ZnO的3.20eV减小到3.11eV。样品光致发光主要有397nm的紫外发射和450,466nm处的蓝光发射,Fe的掺入降低了ZnO的发光强度,但并不影响其发光峰位。样品显示明显的室温铁磁性,磁性随掺杂浓度升高而减弱。

The samples of Zn1-xFexO（0.00≤x≤0.10） were synthesized by co-precipitation method.The structure,optical and ferromagnetic properties were examined using X-ray diffractometer,infrared spectrometer,UV-Vis spectrophotometer,fluorescence spectrometer and vibrating sample magnetometer.The results showed that all the samples exhibited the hexagon wurtzite structure without any secondary phases.The absorptivity of samples reached to 95% in ultraviolet bands and the absorption rate in visible bands increased obviously with doping,and the band gap of Zn1-xFexO decreased from 3.20eV to 3.11eV.The photoluminescence characteristics of Zn1-xFexO showed the ultraviolet emission and blue emission peaks.Evident reduction of the photoluminescence intensity was caused by Fe doping,while the location of the main peaks did not move.The samples exhibited obvious room temperature ferromagnetism and the magnetism decreased with the increasing of Fe concentration.