Stability and compatibility of lanthanum silicates electrolyte with standard cathode materials. Issue 5 (1st April 2019)

• Record Type: Journal Article
• Authors: Xiang, Jun; Chen, Hong-Quan; Ouyang, Jia-Hu; Liu, Zhan-Guo; Yu, Jing-Yuan; Wu, Fu-Fa; Zhao, Rong-Da; Shang, Jian; Liu, Liang
• Is Part Of: Ceramics international. Volume 45:Issue 5(2019)
• Page Start: 6183
• Page End: 6189
• Publication Date: 2019-04-01
• Subjects: Crystal structure -- Electrical conductivity -- Thermal expansion coefficient -- Compatibility -- Stability; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.12.095
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Lanthanum silicate (LSO) electrolytes doped with different valence cations are successfully synthesized by solid state reaction. Crystal structure, electrical properties, stability and compatibility with cathode materials are characterized. The measured total conductivities of LSO electrolytes doped with In 3+, Nb 5+ and W 6+ are relatively high compared with that of undoped La10 Si6 O27, which is attributed to more carriers including either excessive oxygen vacancies generated when doping with In 3+ or more interstitial oxide-ion O (5) generated when doping with Nb 5+ and W 6+ . The thermal expansion coefficients of La10 Si5.9 A0.1 O27± δ (A = In 3+, Si 4+, Nb 5+, W 6+ ) electrolytes vary from 8.48 to 8.83 × 10 –6 K –1 at 1073 K. The doped LSO electrolytes match well with (La0.75 Sr0.25 )0.95 MnO3± δ cathode at temperatures below 1573 K, which is highly stable, to some extent, in various atmospheres of CO2 or H2 O vapour.