The electrical conductivity of NaxLa(1−x)/3NbO3 ceramics has been studied over a composition range of 0.15 ≤ x ≤ 0.45 to identify optimal conductivity conditions and to elucidate the structural and chemical factors affecting the Na+ ion conductivity. The composition with x = 0.25 achieves the highest total conductivity of 7.0 × 10−4 S cm−1 at 350 °C, with Na+ ion transference number of unity. The random distribution of Na, La and vacancy in the two crystallographically independent A sites in perovskite structures significantly impacts the conductivity. In addition, NaxLa(1−x)/3NbO3 perovskite ceramics exhibit high dielectric constants (εr = 220−470) and suppressed electronic conductivity, making them potentially beneficial as an interfacial material to mitigate chemical potential differences between electrolytes and electrode active materials.

中文翻译：

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钙钛矿型镧铌酸钠陶瓷中的钠离子传导


在 0.15 ≤ x ≤ 0.45 的成分范围内研究了 NaxLa（1−x）/3NbO3 陶瓷的电导率，以确定最佳电导率条件并阐明影响 Na+ 离子电导率的结构和化学因素。x = 0.25 的组合物在 350 °C 时实现了 7.0 × 10-4 S cm-1 的最高总电导率，Na + 离子转移数为单位。钙钛矿结构中两个晶体学上独立的 A 位点中 Na、La 和空位的随机分布显着影响电导率。此外，NaxLa（1−x）/3NbO3 钙钛矿陶瓷表现出高介电常数 （εr = 220−470） 和抑制的电子导电性，使它们可能有益于作为界面材料来减轻电解质和电极活性材料之间的化学电位差。