氩气热处理对天然金红石可见光响应的影响

利用高温管式炉对天然含钒、铁金红石在氩气气氛下进行了500～1000℃的热处理改性.粉晶X射线衍射分析表明:随着热处理温度的升高,金红石晶胞发生不同程度的膨胀;加热到900℃以上时,样品中出现钛铁矿物相.通过测试热处理前后样品的紫外-可见漫反射吸收光谱发现,氩气热处理能明显提升天然金红石在可见光区的吸收强度.和空气气氛加热相比,氩气气氛热处理更有利于提高其可见光响应.

The effects of argon heat treatment on the response of visible light to natural rutile

In this study, the natural vanadiferous and ferruginous rutile was modified by heat treatment with the temperatures ranging from 500～1 000℃ under the condition of argon atmosphere. XRD patterns of treated samples have revealed that there exist different levels of cell expansion with the increasing temperature, and a new phase, ilmenite, is formed above 900℃. The UV-vis diffuse reflection spectra show that the visible absorption is distinctly improved after argon heat treatment. Compared with the previous modification under air atmosphere, the heat treatment under argon atmosphere proves to be more efficient in raising the visible light response.