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研究了微波合成SiTiO_3的合成过程,XRD及电子探针的结果表明这一反应过程是由扩散控制,微波场的存在使扩散过程明显增强,存在有Sr和Ti元素的相互扩散,与常规合成有较大不同.从微波合成和常规合成反应产物的组成及显微结构等方面说明微波合成与常规合成具有不同的反应机理,微波合成在反应过程中没有出现其他的中间相,反应动力学计算表明反应过程的动力学符合Carter方程,反应的活化能为129kJ/mol,约为常规合成的1/2～1/3.
The synthesis process of SiTiO_3 by microwave was studied. The results of XRD and electron probe showed that the reaction process was controlled by diffusion. The existence of microwave field enhanced the diffusion process obviously. There existed interdiffusion between Sr and Ti, Which is different from microwave synthesis and conventional synthesis of the reaction product composition and microstructure of the microwave synthesis and conventional synthesis have different reaction mechanism, microwave synthesis in the reaction process does not appear other mesophase, reaction kinetics calculations show The kinetics of the reaction follows the Carter equation and the activation energy of the reaction is 129 kJ / mol, which is about 1/2 to 1/3 of that of conventional synthesis.