Chemical Stability and Electrical Conductivity of Ba0.8Ce0.85-xZrxTb0.15O3-δ Proton Conductors with ZnO as Sintering Aid. Issue 1 (2nd January 2016)

• Record Type: Journal Article
• Authors: Islam, Quazi Arif; Nag, Sourav; Basu, Rajendra Nath
• Is Part Of: Transactions of the Indian Ceramic Society. Volume 75:Issue 1(2016)
• Page Start: 25
• Page End: 32
• Publication Date: 2016-01-02
• Subjects: Ceramics -- Proton conductor -- Stability -- Defects -- Ionic conductivity; Pottery -- India -- Periodicals; 666.306254
• DOI: 10.1080/0371750X.2015.1136238
• Languages: English
• ISSNs: 0371-750X

Abstract

ABSTRACT: The chemical stability of Ba0.8 Ce0.85-x Zrx Tb0.15 O3-δ (0.1≤×≤0.5) has been studied in dry 5% H2 /Ar, wet 5% H2 /Ar and dry CO2 atmosphere at higher temperature. These materials are promising candidates for mixed ionic electronic conductor based H2 separation membr ane. The materials are prepared by combustion synthesis technique successively followed by calcination at 1100°C and sintering at 1550°C in air. The stabilization mechanism of sintered specimens in various atmospheres is explained with respect to the combined effect of zirconium oxide and zinc oxide as stabilizing agent and sintering aid respectively. Zr 4+ introduction into Ce 4+ site of doped bar ium cerate perovskite enhances the chemical stability of these materials, particularly for the composition with x>0.3. The stable sintered material is obtained with total electrical conductivity of 0.0189 S.cm −1 for the composition Ba0.8 Ce0.35 Zr0.5 Tb0.15 O3-δ in moist reducing atmosphere at 900°C. So, in the present work, we report a composition which shows excellent stability in pure CO2 atmosphere at high temperature without much compromising its ionic conductivity. GRAPHICAL ABSTRACT: