The electrical properties of A-site Ca-doped LaNbO with the addition of As in the B-site, have been investigated. Total, grain- and specific grain boundary electric conductivities in different oxygen partial pressure, and water vapour partial pressure were determined. Additional conductivity measurements were performed in nitrogen, to suppress the possible p-type conductivity, focusing on protonic conductivity. The maximum measured total conductivity was recorded for LaCaNbAsO at 800 °C, which was equal to 1.2·10 S·cm in HO- humidified air, and 2.2·10 S·cm in HO- humidified N. From the deconvoluted data, the lowest activation energies for grain conduction were obtained in both atmospheres for LaCaNbAsO. In the temperature range 400 °C – 550 °C it was 0.23 eV and 0.13 eV respectively for HO- humidified air and HO- humidified N. The results show that the increasing arsenic amount mainly influences the activation energies, whereas the calcium addition slightly improves the grain conductivity. The pO experiments revealed that in oxidizing atmospheres, electron holes contribute to the conductivity. The high proton transfer numbers were obtained for each sample, peaking at t = 0.91 for LaNbAsO at 400 °C. Interestingly, even at elevated temperatures relatively high values are obtained where t = 0.87 was recorded at 800 °C for LaCaNbAsO.

中文翻译：

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A位Ca掺杂LaNb1-xAsxO4-δ陶瓷的电性能

研究了在 B 位添加 As 的 A 位 Ca 掺杂 LaNbO 的电性能。测定了不同氧分压和水蒸气分压下的总电导率、晶界电导率和特定晶界电导率。在氮气中进行了额外的电导率测量，以抑制可能的 p 型电导率，重点关注质子电导率。 LaCaNbAsO 在 800 °C 时测得最大总电导率，在 H2O2 湿润空气中等于 1.2·10 S·cm，在 H2O2 湿润 N 中等于 2.2·10 S·cm。在两种气氛中都获得了 LaCaNbAsO 的晶粒传导活化能。在 400 °C – 550 °C 的温度范围内，H2O-加湿空气和 H2O-加湿 N 的活化能分别为 0.23 eV 和 0.13 eV。结果表明，砷含量的增加主要影响活化能，而钙的添加略有改善颗粒电导率。 pO 实验表明，在氧化气氛中，电子空穴有助于电导率。每个样品都获得了高质子转移数，LaNbAsO 在 400 °C 时的峰值为 t = 0.91。有趣的是，即使在高温下，LaCaNbAsO 也能获得相对较高的值，其中 800 °C 下记录的 t = 0.87。