Laser Sintering of BaTiO{sub}3 Ceramics obtained from Nanometric Powders

摘要

We have studied the synthesis and sintering of BaTiO{sub}3 (BTO) nanometric powders produced by Pechini technique. A laser sintering procedure was applied to the BTO and its major advantage was the quickness of the processing. We have used the radiation of a CO{sub}2 laser (CW - 100 W) as the heating source. A linear rate of irradiation was applied to avoid macroscopic defects. The calcined powder at 800°C presented a single crystalline phase confirmed by the XRD and a crystallite size of 20 nm. BTO ceramics sintered at P{sub}(max) = 7.0 W/mm{sup}2 for 10 min of irradiation showed a high relative density (98 ± 1)% with an average grain size of 400 nm for a total time of sintering of 40 minutes.