Abstract
The effect of Sm2O3-dopant on the microstructure and dielectric properties of barium zirconium titanate ceramics has been investigated. It has been discovered that trace Sm2O3-dopant in barium zirconium titanate ceramics could greatly affect the dielectric and sintering behaviour. With the increase of Sm2O3 in BaZr0.15Ti0.85O3, the Curie point will shift to lower temperature, and the relative permittivity reach to a maximum of more than 23,000 at the content of 0.75wt%. SEM observations show that there exists a crisis content of 0.05wt%, below that the increasing Sm2O3-dopant will promote the densification of barium zirconium titanate ceramics during sintering, while above that the increasing dopant content will depress the densification of the ceramics with the dopant content less than 0.1wt%. More Sm2O3-dopant than 0.1wt% can facilitate the grain growth and enhance the density again. The substitution of Sm3+ for cations in the perovskite lattice can account for these effects.
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