六方相NaDyF4微纳米晶的水热合成

摘要

采用水热法合成六方相NaDyF4微纳米晶,考察反应温度、反应时间、F-和Dy3+的摩尔比等对产物晶型和形貌的影响.采用X线衍射仪(XRD)和扫描电子显微镜(SEM)对试样进行表征.结果表明:在水-乙醇-油酸体系中,固定水、乙醇和油酸的体积分别为10、12、6mL,NaOH为0.5g,调整F-和Dy3+的摩尔比值为4、5、7和10,220℃反应72 h,可以得到片状、短棒状、六棱柱状和长棒状等纯六方相NaDyF4微纳米晶.提出了六方相NaDyF4微纳米晶可能的生长机制.%Hexagonal NaDyF4 micro-nanoerystals was synthesized by hydrothermal method. The effects of the reaction temperature,reaction time and molar ratio of F- to Dy3+ on the crystal structure and morphology of product were investigated. The sample was characterized by X-ray diffraction (XRD) and scanning electron microscopy ( SEM). Results showed that pure hexagonal phase NaDyF4 miero-nanoerystals with the morphologies, such as micro-nanoplates,short micro-nanorods,short micro-nanoprisms, and long micro-nanorods, could be obtained in the water-ethanol-oleic acid reaction system by changing F - to Dy molar ratio of 4,5,7 and 10,when other synthetic parameters were set as reaction time of 72 h,reaction temperature of 220 ℃, water-ethanol-oleic acid of 10,12 and 6 Ml and NaOH of 0. 5 g. The possible growth mechanism of hexagonal NaDyF4 micro-nanoerystals was proposed.