ZnO was added as a dopant, in concentrations of 2, 3, and 4 wt-%, to alumina based porcelain batches, in order to study its effect on the fired materials characteristics. An additional composition containing 4 wt-%ZnO and 1 wt-%LiF was also investigated. The results showed that the addition of 4 wt-%ZnO decreased the maturing temperature and improved the electrical properties. It also promoted the development of a mullite phase from the glassy phase. On the other hand, the combination of ZnO and LiF had a negative effect on the electrical properties and on the mullite content. The Li+ ions caused the dissolution of mullite crystals and the crystallisation of new phases.
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