水/醇溶剂热制备LaPO₄及其振动光谱研究

Study on Vibrational Spectra of LaPO₄ Prepared by Water/Alcohol Solvothermal Method

摘要: 稀土磷酸盐具有优于其他材料的光、电、磁等方面的独特属性。本文采用水/醇溶剂热法制备LaPO₄粉体，采用水/乙醇为混合溶剂，可以降低传统水热法的加热温度，在120℃下制备出LaPO₄粉体。采用X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)、差热分析(DTA)、拉曼光谱、荧光分析等手段对合成样品的物相、晶体结构、形貌、振动光谱能进行了表征和分析。水–乙醇体系中，随着水的含量减少，粉体形貌由长棒状向短棒状转变，有向块状发展的趋势，随后，对优化工艺条件下的LaPO₄的红外光谱和拉曼光谱各振动模进行了指认。

Abstract: Rare-earth phosphate materials have unique properties that are superior to other materials in terms of light, electricity, magnetism and so on. In this article, LaPO₄ powders were synthesized by water/alcohol solvothermal method. When water/ethylalcohol mixed liquor chosen as solvent, 120℃ heating temperature could achieve the synthesis condition of LaPO₄ with monoclinic phase structure, which was lower than that of traditional hydrothermal method. The morphology, phase and vibration mode of LaPO₄ were investigated by XRD, SEM, FT-IR and Roman spectrum analysis. In the water/ethylalcohol system, as the water content decreased, the morphology of the powder changed from rod-like to short-rod-shaped particles. And, various vibration modes of LaPO₄ were identified in vibration spectroscopy.