| 聚合物前驱体方法低温合成LiTaO3纳米粉体 |
| Low Temperature Preparation of Nano-crystalline LiTaO3 Powders by Polymeric Precursor Method |
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| 摘要: 采用聚合物前驱体方法，以柠檬酸为配位剂，乙二醇为酯化剂，低温合成纳米LiTaO3粉体。以红外光谱和拉曼光谱研究了柠檬酸与金属离子的配位情况。当柠檬酸和金属离子物质的量的比为2.5∶1、柠檬酸和乙二醇的物质的量比为1∶2时可形成稳定的Li-Ta前驱体溶胶。用差热-热重对凝胶前驱体的热分解历程进行分析，采用X射线衍射和红外光谱对Li-Ta凝胶前驱体及不同温度下煅烧所得粉体的相组成进行分析。结果表明，凝胶前驱体经600 ℃下煅烧2 h可以得到纯钙钛矿型纳米LiTaO3粉体，平均粒径为60～80 nm。 |
| 关键词: LiTaO3粉体 柠檬酸 聚合物前驱体方法 |
| 基金项目: |
| Abstract: Nanocrystalline LiTaO3 powders were prepared by using the polymeric precursor method. The metal cations were chelated in an aqueous solution with citric acid(CA) as chelating agent and ethylene glycol(EG) as esterification agent. The complex between metal cations and citric acid was characterized by FTIR and Raman spectroscopy. Homogeneous Ta-citric acid solution precursor was obtained with the molar ratio of CA: metal cations=2.5∶1 and CA∶EG=1∶2. The thermal decomposition of the precursors was studied by TG-DTA analysis. The phase transformation of LiTaO3 powders with calcination temperatures was studied by FTIR and XRD. The results show that by heat-treatment at 600 ℃ for 2 h, perovskite structure LiTaO3 powders with average grain size of 60～80 nm could be achieved. |
| Keywords: LiTaO3 powders citric acid polymeric precursor method |
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| 赵九蓬,权茂华,李 垚,强亮生.聚合物前驱体方法低温合成LiTaO3纳米粉体[J].无机化学学报,2008,24(11):1869-1873. |
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