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The compositional homogeneity in the ceramic solid solutions is settled both by the process of the mixing of raw materials and by that of the diffusion during the firing. The mechanical mixing of raw materials is not effective against the homogenization below the grindable size. The homogenization process by the diffusion is not effective at large size. The gap where neither mechanical mixing nor diffusion is effective was con sidered to be the origin of the inhomogeneity in solid solutions. In order to verify this, a method to evaluate the region size of inhomogeneity was developed. Five areas having a certain size were randomly chosen on the EPMA image of a sample. Each area was divided into sixteen portions and the standard deviation of com position among these portions was estimated. This standard deviation can be considered as a degree of com positional inhomogeneity. The average standard deviation among the five areas was calculated. Such calcula tion was carried out for various sizes. The average standard deviations were plotted against the size. Plots for models, in which the distribution of the composition forms a check pattern, exhibited peaks. The posi tion of the peaks corresponded to the size of the check patterns. This method was applied to PZT samples prepared by the solid state reaction. The plots revealed the presence of the gap where neither mechanical mixing nor diffusion is effective. [Received November 19, 1997; Accepted March 30, 1998]

Determination of Region Size of Inhomogeneity in Lead Titanate Zirconate