低温固态反应制备纳米钛酸锶粉体

Synthesis of SrTiO_3 nanopowder by solid-state reaction at low temperature

以TiCl4和Sr(OH)2.8H2O为原料,采用低温固态反应法制备了钛酸锶纳米粉体。利用XRD和TEM对所制粉体进行了表征,研究了研磨时间、反应时间和反应温度对钛酸锶纳米粉体相结构的影响。结果表明:制备钛酸锶纳米粉体的最佳研磨时间、反应温度和反应时间分别是1h,40℃和5h。在该条件下制得的钛酸锶纳米粉体为纯立方相SrTiO3晶体,颗粒呈均匀方形,分散性较好,平均粒径为40nm左右。该低温固态反应的速度控制步骤为化学反应。

SrTiO3 nanopowders were synthesized by solid-state reaction at low temperature with ZiCl4 and St（OH）2 · 8H2O as raw materials. The prepared SrTiO3 nanopowders were characterized using XRD and TEM techniques, and the effects of grinding time, reaction temperature and reaction time on the phase structure of synthesized nanopowders were studied. Results show that the optimal grinding time, reaction temperature and reaction time for preparing SrTiO3 nanopowders were 1 h, 40 ℃ and 5 h, respectively. Nanopowders synthesized under the optimal condition are all SrTiO3 crystal with cubic phase, composed of uniformly dispersed square particles with an average size of about 40 nm. The solid-state reaction at low temperature is found to be controlled by chemical reaction.