The SEM micrographs of the Li2ZnTi3O8 ceramics with different amounts of Bi2O3 sintered at 950 1C are shown in Fig. 3. The porosity of the Li2ZnTi3O8 ceramics decreases with increasing Bi2O3 addition , while the average grain sizes of the Li2ZnTi3O8 ceramics increase with increasing Bi2O3 addition. It illustrates that the Bi2O3 additions accelerate the grain growth due to the formation of second phase Bi2Ti2O7 during sintering. However ,with the2.5wt% Bi2O3 addition, the abnormally bigger grain and the phenomenon of partial over- sintering are observed in the Li2ZnTi3O8 ceramic. An uniform and dense microstructure is observed in the Li2ZnTi3O8 ceramics with 2.0wt%Bi2O3 additions.