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中国物理学会期刊

共掺杂金红石TiO2的电子结构和红外光谱研究

CSTR: 32037.14.aps.60.037802

The electronic structure and infrared spectroscopy of Al-H and Fe-H codoped rutile-type TiO2

CSTR: 32037.14.aps.60.037802
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  • 本文对大别山双河、碧溪岭地区硬玉石英岩中的金红石进行了Fourier变换红外光谱(FTIR)分析, 结果显示所有金红石颗粒分别在3280 cm-1和3295 cm-1 出现强的吸收峰. 基于前人提出H在金红石结构中以孔道中心(CC)和八面体共边(BOE)方式存在的两种模型, 本文采用第一性原理计算方法研究了掺杂(Al, H)和(Fe, H)时金红石相TiO2的晶体结构和电子结构. 根据O—H键的振动频率和O—H…O键中O—O之间距离的经验关

     

    Rutile from Shuanghe and Bixiling area in the Dabie Orogen were investigated by Micro- Fourier transform infrared spectroscopy (FTIR). The results show that all the grains exhibit a sharp band near 3280 cm-1 or 3295 cm-1. Two structures have been suggested about the position of H in rutile, namely the chanel center (CC) and basal octahedron edge (BOE) models. The lattice structure and electronic band structure of Al—H and Fe—H codoped rutile TiO2 has been calculated by first-principles method. According to O—H bond vibration frequency of FTIR and O—H…O bond distance between O—O of computational results, we deduce that modified channel center (MCC) model is more reasonable. The calculation results indicate that the t2g state of Fe overlaps with the O 2p state, which will narrow the band gap and lead to red shift in optical absorption spectra.

     

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