离子电导率
兴奋剂
电导率
接受者
空位缺陷
钙钛矿(结构)
无机化学
材料科学
铋
氧化物
离子
分析化学(期刊)
化学
物理化学
电极
电解质
结晶学
凝聚态物理
有机化学
冶金
物理
色谱法
光电子学
作者
Duke P.C. Shih,Ainara Aguadero,Stephen J. Skinner
摘要
Abstract Sodium–bismuth–titanate (NBT) has recently been shown to contain high levels of oxide ion conductivity. Here we report the effect of A‐site monovalent ions, M + = K + and Li + , on the electrical conductivity of NBT. The partial replacement of Bi 3+ with monovalent ions improved the ionic conductivity by over one order of magnitude without an apparent change of the conduction mechanism, which is attributed to an increase in the oxygen vacancy concentration based on an acceptor‐doping approach. The 18 O tracer‐diffusion coefficient ( D* ) determined by the isotope exchange depth profile method in combination with secondary ion mass spectrometry confirmed that oxygen ions are the main charge carriers in the system. Among these acceptor‐doped samples, 4% Li doping provides the highest total conductivity, leading to a further discussion of doping strategies for NBT‐based materials to enhance the electrical behavior, is discussed. Comparisons with other oxide‐ion conductors and an oxygen‐vacancy diffusivity limit model in perovskite lattice suggested that the doped NBT‐based materials might already have achieved the optimization of the ionic conductivity.
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