Selective self-propagating combustion synthesis of hexagonal and orthorhombic nanocrystalline yttrium iron oxide |
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| Authors: | Ling Wu Lizhi Zhang Siukong Li |
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| Institution: | a Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, Chinab Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China |
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| Abstract: | Macroporous nanocrystalline YFeO3 was prepared by a self-propagating combustion method using yttrium nitrate and iron nitrate as precursors and glycine as a fuel. The phase structure of the product can be selectively controlled to be hexagonal or orthorhombic by simply adjusting the ratio of glycine to nitrate. The samples were characterized by X-ray diffraction (XRD) analysis, N2 adsorption, micro-Raman spectroscopy, Fourier transform infrared absorption spectroscopy (FT-IR), thermal analysis (TGA/DSC), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and magnetic property analysis. Photocatalytic activity for the degradation of methylene blue in water under visible light irradiation shows that the orthorhombic YFeO3 is superior to the hexagonal form. More adsorbed oxygen and ferromagnetism of the orthorhombic sample may explain its high activity. |
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| Keywords: | Self-propagating combustion Nanocrystalline yttrium iron oxide Hexagonal structure Orthorhombic structure Photocatalysis |
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