对不同球磨时间的BaC03,CeO2和Y2O3原料粉体进行固相反应,合成了不同粒度的BaCe0.90Y0.10O3-α粉体.将其冷压成型、高温烧结后,获得了不同致密度的BaCe0.90 Y0.10 O3-α样品.利用激光粒度分析、差式扫描量热-热重、X射线衍射和扫描电镜技术研究了球磨时间对粉体粒度、合成过程、晶体结构及样品微观形貌的影响.结果表明:适度延长球磨时间,原料颗粒细化,BaCe0.90 Y0.10 O3-α的合成温度降低,合成粉体的粒度变小、分布变窄、比表面积增大,从而提高了烧结样品的致密度.利用电化学阻抗谱技术测量了原料球磨6 h和10 h的BaCe0.90 Y0.10 O3-α烧结样品在空气中573～1 073 K内的阻抗谱,并计算出其电导率分别为3.25×10-3～6.98×10-2 S·cm-1和5.46×10-3～7.20×10-2S·cm-1.在测试温度范围内,两种样品的电导率与温度的关系符合Arrhenius方程,电导激活能分别为0.39 eV和0.34 eV.提高烧结样品的致密度是降低电导激活能,提高导电性能的有效途径.BaCe0.90 Sm0.10 O3-α,BaCen0.90 Y0.10 O3-α和BaCe0.85 Y0.15 O3-α的电导激活能依次降低,符合理论预测.
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