The mechanism of microwave synthesis for SrTiO~3

Abstract

The difference of intermediate products, microstructure and element concentration in the particles between microwave synthesized samples and conventional samples were responsible for the exiting of non- thermal effect in the microwave field. The diffusions of ionic in the microwave field were enhanced so that the diffusion of Ti^4^+ could not be neglected as in the conventional solid state reactions. The influence of the microwave field was mainly expressed as diffusion coefficient and the driving force of ionic motion. The intermediate phase which occurred in the conventional solid reaction was not found during microwavesyntheses. The quantitative analysis based on XRD experimental data shows that the reaction dynamics in microwave is suitable for the Carter equation. The activation energy for reaction of SrCO~3 and TiO~2 in the microwave field is 129kJ/mol, which is only about one third of that of conventional reaction.

Key words: REACTION MECHANISM, MICROWAVE TECHNIQUE, DIFFUSION, REACTION KINETICS

CLC Number:

TQ11

Cite this article

Liu Hanxing;Liu Zhijian;Ou Yangshixi. The mechanism of microwave synthesis for SrTiO~3[J]. Acta Chimica Sinica, 1999, 57(5): 472-478.

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微波合成SrTiO~3的反应机理