Citation: WANG Ling, YANG Xue-Bin, ZHOU Hui-Zhu, LI Yue-Hua, DAI Lei. Investigation on Effect of Sr Doping on Properties of Protonic Conductor La1-xSrxNbO4-σ[J]. Chinese Journal of Inorganic Chemistry, ;2014, (2): 310-316. doi: 10.11862/CJIC.2014.063
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The proton conductors La1-xSrxNbO4-σ (0≤x≤0.02) are synthesized by solid-state reaction and their properties are characterized. XRDanalysis shows that all composition samples are monoclinic structure; with an increase in Sr doped amount, cell volume becomes big; La1-xSrxNbO4-σ samples display excellent chemical stability in boiling water and carbon dioxide atmosphere. SEManalysis shows that after the La1-xSrxNbO4-σ powders are sintered at 1500 ℃ for 8 h in air, dense samples with uniform crystalline size are obtained; The Sr doping inhibits crack formation and excessive growth of crystal grain; with an increase in Sr doped amount, crystal grain size becomes small. ACimpedance spectroscopy analysis indicates that conductivities of LaNbO4 are changed by Sr doping and among all samples, La0.995Sr0.005NbO4-σ is of the highest conductivity; the conductivities of the La1-xSrxNbO4-σ samples in humid 5% H2-Ar atmosphere are much higher than that those in dry air; conductivity of La0.995Sr0.005NbO4-σ is 0.003 S·cm-1 in humid 5% H2-Ar atmosphere at 800 ℃ and its conducting activation energy is 0.44 eV.
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