固相反应法制备Co掺杂ZnO的磁性和光学性能研究

Magnetic and optical properties of Co doped ZnO powders synthesized by solid-state reaction

研究了以固相反应法制备Co掺杂ZnO粉体的磁性和光学性能,测试结果表明对于均匀掺杂的Zn0·95Co0·05O粉体,Co2+随机取代Zn2+的位置进入ZnO晶格.Co2+之间的3d自旋电子耦合交换作用使得近邻的Co2+自旋反平行,Zn0·95Co0·05O粉体在3—300K表现为顺磁性,而非铁磁性.

Co doped ZnO powders were synthesized by the solid-state reaction. The magnetic and optical properties of the powders were investigated. The experimental results indicate that Zn^2 ＋ ions were substituted by Co^2 ＋ ions randomly. Zn0.95 Co0.05 O powders prefer pammagnetic state to ferromagnetic state from 3 K to 300 K due to coupling exchange interactions between Co 3d spins, which makes the nearest Co^2 ＋ antiparallel.