Study of La-doped barium titanate ceramics obtained by laser sintering technique
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This work studies the influence of laser sintering on the semiconducting properties of La-doped BaTiO3 (BTL) ceramics. The BTL powders were synthesized using a solid-state reaction method and sintered via a new laser sintering technique. In this technique, a CO2 laser is used as the main heating source and no atmosphere control was employed. The BTL laser-sintered ceramics exhibited high relative density and a crack-free homogeneous microstructures after sintering at a laser power density of 5.0 W/mm2 for 30 s. The samples exhibited a positive temperature coefficient of resistivity (PTCR) increase of two orders of magnitude, and a room-temperature resistivity of 105 Ω.cm, even when sintered in an open atmosphere. X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, and UV-Vis and impedance spectroscopy techniques were employed and results provided.
KeywordsBarium Titanate Laser sintering Electrical properties
The authors are thankful to CAPES (99999.008454/2014-00 and 88881.120970/2016-01) and CNPq/FAPITEC (409017/2016-7) Brazilian agencies for financial support. The Authors (CK and JB) also acknowledge the J. E. Sirrine Foundation for support.