Grain growth in sintered ZnO-1 mol% V₂O₅ ceramics

Grain growth of ZnO containing 1 mol% V₂O₅ was studied for sintering from 750 to 1200 °C in air. The results are discussed and compared with the previous studies in terms of the phenomenological kinetic grain growth expression: Gⁿ - G₀ⁿ = K₀t exp(-Q/RT). Compared with the data found in the literature for pure ZnO, addition of 1 mol% V₂O₅ decreased the grain growth exponent to about 1.44, as well as reducing the apparent activation energy to 76 ± 7 kJ/mol. These values indicate that the addition of V₂O₅ promotes liquid-phase sintering and increased the ZnO grain. These values are also compared with those obtained for ZnO-1 mol% Bi₂O₃ ceramics.