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• 作者：Richard Munson
• 关键词：NdFeB magnets ; Nd-rich phase ; Crystal structure ; Oxygen content
• 刊名：The Electricity Journal
• 出版年：2008
• 期刊代码：50_10406190
• 类别：et
• 出版时间：April 2008
• 卷：21
• 期：3
• 页码：87-88
• 文件大小：111 K

摘要

TiO₂ microspheres with porous frameworks have been prepared by controlled hydrolysis of Ti(OC₄H₉-n)₄ with water generated ȁc;in situ” via an esterification reaction between acetic acid and ethanol, followed by hydrothermal treatment. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, and nitrogen adsorption–desorption methods. The TiO₂ microspheres, with diameters ranging from 100 to 500 nm, were constructed by pure anatase particles with average crystalline size of 16.4 nm. The formation of porous structure might be related to slow hydrolysis under ultrasound irradiation. The formation of unique anatase should be attributed to the presence of SO₄²⁻ ions.