Grain growth kinetic in xCoO–6 wt.% Bi2O3–(94−x) ZnO (x=0, 2, 4) ceramic system

The grain growth kinetics in the 0, 2, 4 wt.% CoO added ZnO–6 wt.% Bi2O3 system was studied using the simplified phenomenological grain growth kinetics equation Gn=K.t.exp(−Q/RT) together with the physical properties of the sintered samples. The grain growth exponent value (n) and the apparent activation energy for the ZnO–6 wt.% Bi2O3 system was found to be 5.2 and ∼200 kJ/mol respectively. The addition of the CoO to the ZnO–6 wt.% Bi2O3 system had no effect in the grain growth. At 0% CoO addition the apparent activation energy was calculated as 204 kJ/mol and with 4 wt.% CoO addition it was calculated as 203 kJ/mol.