Fe掺杂TiO2结构和磁性

在退火温度为773K、Fe掺杂量为n(Fe)/n(Fe+Ti)=1∶25的制备条件下,用溶胶-凝胶法在空气氛围中制备Fe掺杂TiO2稀磁半导体纳米粉末;用直流磁控溅射方法并在真空和空气氛围中结合原位退火工艺,在普通玻璃基片上制备Fe掺杂TiO2薄膜.利用X射线衍射仪(XRD)对其结构进行表征,振动样品磁强计(VSM)对磁性进行表征.结果表明,溶胶-凝胶法制备的粉末材料的磁性为室温顺磁性;直流磁控溅射法制备的薄膜样品在空气和真空氛围中均为室温铁磁性,其中真空退火能够产生更强的铁磁性.这说明可能是薄膜和基底的相互作用产生和铁磁性至关重要的氧空位,而真空环境退火能够增加氧空位.

Structure and magnetism of Fe-doped TiO2

In the condition of annealing temperature of 773 K and Fe-doped content of n(Fe)/n(Fe+Ti)=1:25,the semiconductor nano-powders with Fe-doped TiO2 diluted magnetism were prepared by using sol-gel method in atmospheric ambient and Fe-doped TiO2 films were fabricated on glass substrate with DC magnetron sputtering and in-situ annealing in atmospheric and vacuum environment,respectively.Their microstructure and magnetism were characterized with X-ray diffraction(XRD) and vibrating sample magnetometer(VSM),respectively.The result showed that the powders prepared with sol-gel method were paramagnetic at room temperature,the films prepared with DC magnetron sputtering in atmospheric and vacuum ambient were all ferromagnetic at room temperature,and the ferromagnetic property was especially enhanced by vacuum annealing,showing that this might be caused by the oxygen vacancies produced by the interaction between films and substrates which was of vital importance.And the oxygen vacancies could be increased by vacuum annealing.