Fe、Ni共掺杂ZnO基稀磁半导体光学性能与铁磁性研究

采用水热法成功制备了不同掺杂浓度的Zn_1-2xFe_xNi_xO（x=0，0.025，0.05，0.1）稀磁半导体材料，利用X射线衍射（XRD）、透射电子显微镜（TEM）和X射线能量色散分析仪（XEDS）对样品进行表征，并结合拉曼（Raman）光谱、光致发光光谱（PL）和振动样品磁强计（VSM）研究样品的光学性能和磁学性能。结果表明，水热法制备的样品具有结晶性良好的纤锌矿结构，没有杂峰出现，形貌为纳米棒状结构，分散性良好。Fe²⁺、Ni²⁺是以替代的形式进入ZnO晶格中，Fe和Ni的掺杂使得晶体中的缺陷和应力增加，拉曼光谱峰位发生红移，光致发光光谱发生猝灭现象。另外，共掺杂样品在室温条件下存在明显的铁磁性，饱和磁化强度随着掺杂量的增加而增强。

Optical Properties and Ferromagnetism of Fe and Ni Co-doped ZnO Dilute Magnetic Semiconductors

Diluted magnetic semiconductors Zn_1-2xFe_xNi_xO with different consistency ratio (x=0,0.025, 0.05, 0.1) have been synthesized by hydrothermal method.The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray energy dispersive spectrometry (XEDS), and the optical and magnetic properties of the products were investigated by Raman scattering spectra (Raman), photoluminescence spectra (PL) and vibrating sample magnetometer (VSM).The experiment results show that all samples synthesized by this method possess wurtzite structure with good crystallization, no other impurity phase appeared, and the morphology are nanorods and well dispersed. All the Fe²⁺ and Ni²⁺ successfully substituted for the lattice site of Zn²⁺ and generate single-phase Zn_1-2xFe_xNi_xO, Raman spectra occurred red shift and the photoluminescence intensity were quenched due to the crystal defects and internal stress increase with iron and nickel co-doping. In addition, the obvious ferromagnetic was found in all samples at room temperature, and the saturation magnetization enhanced with the increase of iron and nickel doping content.