Abstract
In this article the influence of mechanical activation on sintering process of magnesium-titanate and barium-zinc-titanate ceramics has been investigated. Both nonactivated and mixtures treated in planetary ball mill for 80 minutes were sintered at 1100?C and 1300?C. The influence of mechanical activation on phase composition and crystal structure has been analyzed by XRD, while the effect of activation and sintering process on microstructure was investigated by scanning electron microscopy. It has been established that temperature of 1100?C was to low to induce final sintering stage for both systems. Moreover, we concluded that barium-zinc-titanate ceramics exhibited better sinterability than magnesium-titanate ceramics.
Highlights
Development of dielectric binary and ternary materials based on TiO2 such as barium, strontium and magnesium-titanates, as well as barium-strontium and barium-zinc-titanates is increasing with a rapid progress in mobile and satellite communications systems
MgTi2O5, MgTiO3 and MgO along with very small concentration of TiO2 phases is observed for the samples activated 80 min, mechanical activation led to particle size reduction and the ratio between final sintering products (MgTiO3 and Mg2TiO4) varied with sintering temperature
Comparing density’s values, it was found that the greatest densification has been achieved after milling process at highest sintering temperatures
Summary
Development of dielectric binary and ternary materials based on TiO2 such as barium, strontium and magnesium-titanates, as well as barium-strontium and barium-zinc-titanates is increasing with a rapid progress in mobile and satellite communications systems. These materials can difer extremely low dielectric loss in the microwave range and high dielectric constant [1,2,3]. Barium-zinc-titanate compounds and magnesium-titanate based materials (MgTiO3 and Mg2TiO4) have attracted great attention for their specific microwave properties As a result they can be used as parts of resonators, filters and multilayer ceramic capacitors [4]. In order to produce nanocrystalline powders and improve the final properties of advanced ceramics, among the other methods, high energy mechanical
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