Effect of sintering temperature, atmosphere and concentration of Pr oxide on the grain growth and grain boundary formation of Pr-doped ZnO was investigated. Grain size of ZnO was maximized at composition of Pr 0.5mol% and grain growth rate and weight loss rate of 0.5mol% Pr-doped ZnO increased drastically above 1350°C, regardless of the sintering atmosphere. The morphology of grain boundary in samples fired above 1350°C was strongly affected by the sintering atmosphere. The grain growth rate was proportional to 1/n-th power of time, with n=4.5 between 1300°C and 1400°C and n=2.2 at 1500°C. An exothermic peak in DTA was observed at 1380°C, which indicated the formation of a liquid phase.
