Abstract
The effect of V2O5 additive on the sintering of SnO2 was studied by measuring relative density and isothermal shrinkage in the temperature range 800 to 1400°C. The optimum amount of V2O5 added was 10wt%, which might be the solid solubility limit of vanadium ion into SnO2 lattice. With this amount of V2O5, the shrinkage behavior agreed with a model based on liquid-phase sintering at lower temperature. At higher temperature above 1250°C, the major parts of the densification occurred very rapidly and was followed by a much slower sintering process typical of volume diffussion. The fast early shrinkage might be caused by the capillary forces of liquid and the rapid formation of solid solution.Grain growth followed the expression G3-G03=At with an apparent activation energy of 104kcal/mol. The volume diffusion of oxygen ion was rate determining step for grain growth in this experiment.
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