Hydrothermal synthesis of barium titanate nanoparticles and study of the densification behaviour during sintering

In this study, BaTiO3 nanoparticles were synthesized by a facile hydrothermal process. Based on TEM and XRD studies, the average particle size was found to be ~50 nm. The synthesized powder was consolidated by diepressing and isostatic pressing and then sintered at different soaking times and temperatures. The effect of pressing conditions on the final density and grain growth of the nanoparticles were studied. It was found that consolidation of the nanoparticles is tricky and needs special attention for compaction without formation of large inter-agglomerate pores. The addition of pressing lubricant, e.g. 2wt% PVA, was shown to be inevitable to achieve green compacts with high sinterability. The proper sintering regime to achieve the nearly dense samples with ultrafine grained structure was established.

کلیدواژه ها:

BaTiO3 ، Nanoparticles ، Hydrothermal ، Densification