Ceramics-Silikáty 50, (4) 225 - 231 (2006)

The grain growth kinetics in the 1, 2, 3 and 4 wt.% SrO doped ZnO was studied using the simplified phenomenological grain growth kinetics equation Gⁿ - G₀ⁿ= K₀ t exp(-Q/RT) together with microstructure properties and densification of the sintered samples. The grain growth exponent values (n) were found to be 5 for 1, 2, 3 and 4 wt.% SrO doped ZnO. The apparent activation energies for 1, 2, 3 and 4 wt.% SrO doped ZnO were found 780 kJ/mol, 709 kJ/mol, 764 kJ/mol and 744 kJ/mol, respectively. The apparent activation energy was increased with doping of SrO because of ZnSrO₂ phase at the grain boundaries. This ZnSrO₂ phase inhibited the grain growth of ZnO. But the increasing SrO level had no effect on the grain growth. Also, the increasing of SrO resulted in a slight reduction in densification at all temperatures.