摘要
Fifty hours of mechanical activation of mixed oxides at room temperature did not trigger the formation of Nd BaPbO 3 (BPO) in the existence of excessive PbO, but decreased the synthesis temperature of the BPO. The crystalline of the activation derived perovskite BPO phase was further established when the activated mixture was subjected to calcination at 650 ℃. The perovskite phase was sintered to a density of 98% of theoretical value at 980 ℃ for 2 h. The sintered BPO with 0.1% Nd doped exhibits a resistivity of 2×10 -4 Ω·cm and an excellent PTC effect at Curie temperature of 750 ℃ .
Fifty hours of mechanical activation of mixed oxides at room temperature did not trigger the formation of Nd BaPbO 3 (BPO) in the existence of excessive PbO, but decreased the synthesis temperature of the BPO. The crystalline of the activation derived perovskite BPO phase was further established when the activated mixture was subjected to calcination at 650 ℃. The perovskite phase was sintered to a density of 98% of theoretical value at 980 ℃ for 2 h. The sintered BPO with 0.1% Nd doped exhibits a resistivity of 2×10 -4 Ω·cm and an excellent PTC effect at Curie temperature of 750 ℃ .
基金
ProjectsupportedbytheNationalNaturalScienceFoundationofChina (5 0 2 72 0 15 )
