The influence of MnCO
3 addition on the sintering behaviour of PZT ceramics was investigated. In proportion as amount of MnCO
3 addition increased, the relative density of sintered body decreased. The shrinking curves during sintering showed the following features ; Starting temperature of shrinking shifted higher as amount of MnCO
3 addition increased. These shrinkages were able to classify into two stages;at the first stage, the shrinking speeds of specimen were relatively slow, but at the second stage, those were rapid. Achieved shirinkage values of each specimen were corresponding to the relative densities. The grain growth behaviour was investigated with SEM micrographs. On the specimen with 0.4wt% MnCO
3, rapid grain growth occurred only between 1050°C and 1150°C, but slow grain growth continued over 1150°C.
On the specimen with 0.8wt% MnCO
3, grain growth did not occured till 1150°C, but rapid grain growth continued over 1150°C. We conclude that the MnCO
3 is not useful for PZT ceramics as a sintering aid.
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