Abstract
The effect of Sb2O3 on the densification of ZnO was studied and compared with that for additives such as ZnSb2O6,α-Zn7Sb2O12, and Sb2O4. Addition of up to 2.0 mol% Sb2O3 raised the densification temperature of ZnO from 600° C to 1000° C regardless of doping level and the particle size of Sb2O3. Addition of other antimony-additives, however, slowed down the densification of ZnO, and the densification temperature increased with increasing amount of additives. Results of TG, XRD and SEM showed that the observed densification characteristics in Sb2O3-doped ZnO are explained by the volatile nature of Sb2O3. Thus, Sb2O3 evaporates during oxidation at about 500° C and condenses on the ZnO particle surfaces as a noncrystalline phase of an unknown composition, which checks the material transport across ZnO particles resulting in the retarded densification.
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