The role of tin oxide addition on the properties of microwave treated CaCu 3Ti 4O 12

Abstract

A microwave (MW) irradiation process was performed to pre-sintered CaCu 3Ti 4O 12. A conventional furnace was used for calcination as well as for the sintering processes, whilst a domestic microwave oven was employed for MW irradiation in order to produce better morphology, improved phase structures and dielectric properties of CaCu 3Ti 4O 12 products. SEM analysis shows that the microstructures of MW irradiated samples are denser, with larger grain size if compared to the untreated samples. Dielectric properties also have been improved by MW treatment with higher dielectric constant and lower dielectric loss. Meanwhile, the addition of tin oxide (SnO 2) to CaCu 3Ti 4O 12 provides strong effects on the dielectric constant of both without and with MW irradiated samples. It was found that the dielectric constant of CaCu 3Ti 4O 12 decreases exponentially with mole percentages of SnO 2. However, the addition of SnO 2 shows better dielectric loss properties of CaCu 3Ti 4O 12.