中南大学学报（自然科学版）2016，Vol.47Issue(7)：2249-2253,5.DOI:10.11817/j.issn.1672-7207.2016.07.010
溶胶凝胶法制备mullite过程中的拉曼光谱和红外光谱研究
Study of Raman and FT-IR spectra for mullite preparation by sol-gel method
摘要
Abstract
The formation of Si and Al sols, and the micro-structural changes of the dual phase Si-Al gel in the in-situ crystallizing process were investigated by Laser Raman(LRa), Fourier Transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The results show that the disordered network structure is composed of Si—O…H and Al—O…H groups in the Si and Al sols, respectively. After the thermal treatment at 600℃, the dual phase Si-Al gel is obtained with non organic impurity phase. At 800 ℃, the amorphous structure of the Si-Al double gel apparently reorganizes, resulting in the formation of a small amount of AlO4 tetrahedron and AlO6 octahedral units. The Si-Al spinel was crystallized from the sample at 1 000 ℃. With the increase of temperature, the peak of Al-Si spinel enhances and then disappears in the XRD pattern. At 1 200 ℃, the characteristic FT-IR bands of mullite at 1 130 cm−1 and 1 170 cm−1 indicates that the Al—O—Si bond is formed, and the Raman bands at 310, 410, 600, 960, 1 037 and 1 129 cm−1 typical for mullite occur. When the temperature increases to 1 450℃, the main crystalline phases are identified as mullite with a small amount of Alumina, the spinel phase disappears. These results indicate mullite is formed from the Si-Al spinel, which is metastable phase at 1 200−1 400℃in the heating process of the dual phase gel.关键词
溶胶-凝胶/红外光谱/拉曼光谱/微结构变化Key words
sol-gel/FT-IR/Raman/microstructure change分类
化学化工引用本文复制引用
谭小平,梁叔全,秦利平..溶胶凝胶法制备mullite过程中的拉曼光谱和红外光谱研究[J].中南大学学报（自然科学版）,2016,47(7):2249-2253,5.基金项目
国家自然科学基金资助项目(50721003)；湖南有色研究基金资助项目(YSZN2013CL07)(Project(50721003) supported by the National Natural Science Foundation of China （50721003）
Project(YSZN2013CL07) supported by the Hunan Nonferrous Metals Research Fund) （YSZN2013CL07）
