Abstract
The effects of nepheline tailing and ZnO on the physical, mechanical, microstructure and dielectric properties were investigated. Specimens fired at 1125 °C from batches containing 40 mass % nepheline tailing (product nepheline syenite beneficiation process) and 2 mass % ZnO showed a maximum MOR of 44.81 MPa. The main phases recorded were quartz, cristobalite, albite, hematite and gahnite. The dielectric constant (ε’) and dielectric loss (ε”) of ceramic bodies based on nepheline syenite tailing and clay as well as with 2 and 5% Zn were determined at temperatures between (25 to 275 °C) and over a wide range of frequency between 100 Hz and 1MHz. It was found that both ε’ and ε” showed increase with rise in temperature and fall in frequency. On the other hand, both ε’ and ε” showed a decrease on the addition of zinc oxide, attributed to the presence of gahnite (ZnAl2O4), which significantly enhanced their dielectric properties.
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