Area of research
Materials Chemistry · Electronic, Optical and Magnetic Materials
Research interest
Research topics from publications: Nanocrystalline semiconducting donor-doped BaTiO3 ceramics for laminated PTC thermistor; Effects of BaCO3 addition on the microstructure and electrical properties of La-doped barium titanate ceramics prepared by reduction-reoxidation method; Abnormal reoxidation effects in Ba‐excess La‐doped BaTiO 3 ceramics prepared by the reduction‐reoxidation method. Representative work: Abstract Ba‐excess La‐doped BaTiO 3 ceramics have been successfully applied to prepare laminated chip thermistor. Ceramics were firstly fired in a high‐purity N 2 flow and then reoxidized in air to obtain positive temperature coefficient of resistivity effect. However, an abnormal reduction trend of room‐temperature ( RT ) resistivity was found to be always beginning at ~800°C during reoxidation. This anomaly was found closely correlated with the insulating second phase (Ba 2 TiO 4 ) at grain boundary, which destroyed conducting pathways between semiconducting BaTiO 3 grains. When reoxidation temperature was up to ~800°C, the insulating Ba 2 TiO 4 could be gradually consumed and then conduct