微波水热合成钛酸钡纳米粉体

Synthesis of BaTiO_3 Nano-powder by Microwave Hydrothermal Method

采用微波水热法低温合成了立方相钛酸钡纳米粉体。通过正交实验法及线性回归，研究了反应温度、反应时间及分散剂用量等因素对颗粒比表面积的影响规律及回归函数，并通过XRD、TEM、XRF等对粉体进行了表征。研究结果表明，在反应温度70℃、反应时间10min、分散剂与钛的物质的量比为1：20的条件下制得粒径约50—100nm、呈球状的分散性良好的立方相钛酸钡纳米粉体。反应温度、反应时间及分散剂用量对粒度均有不同程度的影响，其中反应温度影响最为显著。

Cubic phase barium titanate nano-powders were synthesized under low temperature by microwave-hydrothermal method. The influence law of factors such as reaction temperature, reaction time, and the dispersant dosage on the specific surface area of particles and regression function were studied by the orthogonal experiment method and linear regression. The crystallized products were characterized by powder X-ray diffraction （XRD）, transmission electron microscopy （TEM）, X-ray fluorescence（XRF）. The experimental results showed that the spherical and well-dispersed cubic phase barium titanate nano-powders which particle size is about 50-100 nm could be prepared under the conditions that the reaction temperature is 70℃, and the reaction time is 10 min, and mole ratio of dispersant and titanium is 1 ： 20. Reaction temperature, reaction time, and the dosage of dispersant have different effect on the specific surface area of particles. Among these factors, the significant factors is reaction temperature.