材料科学
正交晶系
电导率
兴奋剂
钙钛矿(结构)
分析化学(期刊)
质子
电解质
掺杂剂
质子导体
电阻率和电导率
质子输运
离子
陶瓷
晶体结构
物理化学
结晶学
电极
光电子学
物理
化学
复合材料
工程类
有机化学
电气工程
量子力学
色谱法
作者
A.S. Lesnichyova,S.A. Belyakov,А. Yu. Stroeva,А. В. Кузьмин
标识
DOI:10.1016/j.ceramint.2020.10.189
摘要
In this work, we set out to investigate the electrical conductivity of single-phase and high-density La1-xSrxScO3-δ (x = 0.05; 0.1) ceramics depending on temperature and рО2 and рН2О. The crystal structure of materials was characterized by XRD method. The samples show the structure of an orthorhombic perovskite with a Pnma space group. The unit cell volume increases along with the Sr concentration. The microstructure features of samples were investigated by SEM analysis. The transference numbers of protons and oxygen-ions were determined by the EMF (electromotive force) measurements in a gas concentration cell. In addition, the proton, oxygen-ion and hole conductivities were evaluated from the рО2-dependencies of electrical conductivity at different humidity. The results obtained using both methods showed a good level of agreement. It is found that the partial conductivity of each charge carrier in La1-xSrxScO3-δ increases along with an increase in the concentration of the Sr dopant from x = 0.05 to x = 0.1. The highest proton conductivity about 3 × 10−2 S cm−1 is achieved for La0·9Sr0.1ScO3-δ at 800 °C. The mobility of proton defects increases with Sr concentration and reaches 2.5 × 10−4 cm2 V−1 s−1 at 800 °C for La0·9Sr0.1ScO3-δ. Thus, La0·9Sr0.1ScO3-δ should be considered as a promising proton-conducting electrolyte for various electrochemical devices, such as protonic ceramic fuel cells.
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