Controllable synthesis of hexagonal and orthorhombic YFeO₃ and their visible-light photocatalytic activities

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• 作者：Yuewei Zhang ; Jingxia Yang ; Jianfeng Xu ; Qiuyue Gao ; Zhanglian Hong ; ^{hong_zhanglian@zju.edu.cn}
• 关键词：YFeO3 ; Sol&ndash ; gel preparation ; Phase transformation ; Hexagonal ; Orthorhombic ; Photocatalysis
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 August, 2012
• 卷：81
• 期：Complete
• 页码：1-4
• 文件大小：526 K

摘要

Single phase hexagonal and orthorhombic YFeO₃ were prepared by a citric acid assisted sol-gel process. The prepared samples were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) specific surface area measurement, transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and UV-Vis diffuse reflectance spectroscopy (DRS). The phase composition can be effectively controlled by changing the calcination temperature. It is found that the hexagonal form exhibits a narrow optical band gap in comparison with the orthorhombic one, and shows stronger visible-light photocatalytic activity than the orthorhombic one. Both the narrow optical band gap and unique porous structure are responsible for the high visible-light photocatalytic activity of the hexagonal form.