ABSTRACT The polycrystalline BaBi2Nb2O9 and Ba(Bi0.9Sm0.1)2Nb2O9 ceramics have been fabricated via the molten salt synthesis route. The temperature dependence of dielectric and electrical conductivity properties of BBN and BBSmN ceramics investigated at various frequencies have revealed the characteristic features of relaxor behaviour. The incorporation of Sm3+ for Bi3+ has induced a downward shift in the dielectric maximum temperature (165°C–120°C) with the decrease in dielectric constant maximum (372 – 212) at 100 kHz. The estimated degree of diffuseness (γ) was found to be 2.17 for BBN and 1.93 for BBSmN ceramic samples. The activation energy obtained from the Arrhenius plot revealed the existence of motion of oxygen ion vacancy in these ceramics.

中文翻译：

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未掺杂和掺钐铌酸铋钡铁电陶瓷的介电弛豫和电导特性

摘要 采用熔盐合成法制备了多晶 BaBi2Nb2O9 和 Ba(Bi0.9Sm0.1)2Nb2O9 陶瓷。在不同频率下研究的 BBN 和 BBSmN 陶瓷的介电和电导率特性的温度依赖性揭示了弛豫行为的特征。Sm3+ 与 Bi3+ 的结合导致介电最高温度 (165°C–120°C) 向下移动，介电常数最大值 (372 – 212) 在 100 kHz 处下降。发现估计的扩散度 (γ) 对于 BBN 为 2.17，对于 BBSmN 陶瓷样品为 1.93。从阿伦尼乌斯图中获得的活化能揭示了这些陶瓷中存在氧离子空位运动。