对锐钛矿相TiO2的第一原理计算

用TiO₂作为阳极的光电化学电池的工作以来,对TiO₂的光催化机理的研究已发展成为一个热门研究领域.从第一原理计算的角度,用基于密度泛函理论的全电势线性缀加平面波法,对锐钛矿相TiO₂的晶格结构和电子结构作了比较系统的计算.通过使总能量和原子受力达到最低,得到晶格的优化结构,结果与实验符合得很好.由晶格优化结构得到电子结构,包括能带结构、X射线吸收谱等.其中能带结构间接跃迁能隙为2.12?eV,价带的较高态宽度与X射线衍射谱(XPS)实验值完全一致.

Ab initio calculations of anatase TiO2

When photoelectrochemical cell possessing an anode of TiO 2 was reported, photocatalysis has developed into a major area of intensive investigation. The results of the self-consistent calculations on the anatase phase of TiO 2 was presented. The calculations were performed using the full potential-linearized augmented plane wave method (FPLAPW) in the framework of the density functional theory (DFT). The fully optimized structure, obtained by minimizing the total energy and atomic forces, is in good agreement with experiment. Electronic structures were calculated such as band structure and X-ray spectra,etc.