热处理天然金红石的微结构研究

摘要

The micro-structure of natural rutile heated and annealed under argon atmosphere was studied by means of X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). The results indicate that the lattice of heated rutile specimens was expanded, and ilmenite appeared when the heating temperature reached 900℃ and 1 000℃. Like rutile, ilmenite is a kind of natural semiconductor mineral. It grew in the direction at a 31°angle with rutile's (010) planes and formed dual coupled semiconductor with rutile. The results of the UV-vis test indicate that the appearance of ilmenite in the rutile sample can effectively enhance the photocatalytic activity of the specimens.%利用粉晶X射线衍射(XRD)、透射电镜(TEM)等分析手段对在氩气气氛中加热、退火的天然金红石样品的微结构进行了研究.研究表明样品在热处理后,晶格发生膨胀,并且在900 ℃和1000 ℃的样品中出现了钛铁矿物相.钛铁矿也是一种天然半导体矿物,沿与金红石(010)面网成大约31°夹角的方向生长,与金红石形成了二元复合半导体.紫外漫反射实验结果表明热处理后,金红石中出现的钛铁矿相有效地促进了光催化效果.