纳米Bi_2Sn_2O_7的微乳液法制备与表征

Preparation and Characterization of Nano Bi_2Sn_2O_7 via Water/Oil Microemulsion

以聚乙二醇辛基苯基醚（TX100）-正己醇／环己烷／水溶液相组成的油包水型微乳液体系中的纳米水核作为微型反应器，通过将含有反应试剂的2份微乳液混合的方法，制得Bi2Sn2o7的前驱体，研究了影响前驱体颗粒的粒径和形貌的因素。该前驱体在500℃下煅烧即可形成具有烧绿石结构的四方晶相的Bi2Sn2O7纳米粉体，其平均晶粒尺寸为10nm，粒径分布在10-20nm之间，外观呈球形。在IR谱图上，当煅烧温度为500℃时，Bi2Sn2O2的吸收带呈现出显著的宽化现象。

The precursor of bismuth stannate （Bi2Sn2O7 ） was prepared by precipitation reaction in the nanodroplets of water/TX100/n-hexanol/cyclohexane microemulsion system. Some factors that affected the size and shape of the precursor were investigated . Spherical bismuth stannate particles with single pyrochlore structure were obtained when the precursor was calcined at a temperature as low as 500 ℃. The particle size was in the range of 10 - 20 nm with a mean size close to 10 nm. The IR bands were broadened when calcined at 500 ℃.