Title

Sintering Behavior And Phase Characterisation Of Composite Perovskite/Fluorite Ceramics For Intermediate Temperature Sofcs And Oxygen Separation Membranes

Abstract

The sintering behavior and structural changes of fluorite Gd 0.2Ce0.8O2-δ (GDC) mixed with one of three perovskites: LaMnO3 (LMO), (La0.7Sr 0.3)0.98MnO3 (LSM) and La0.6Sr 0.4Fe0.8Co0.2O3 (LSFC) composite ceramics have been studied. Structural changes occur upon sintering depend on the type of perovskite used to make the composite. The LSFC+GDC composite has been found to sinter easily. The two-step sintering mechanism was found to occur in LSM+GDC composite. Of all types of ceramics, only sintered LMO experiences a phase change at sintering temperatures ≥1200°C from rhombohedral R3̄ C to orthorhombic Pnma structure with respect to its as received powder phase. The transition is notably suppressed when LMO is part of an LMO+GDC composite. GDC in a fluorite and/perovskite composite, when sintered, undergoes a temperature-dependent expansion in its unit cell that is not observed in pure GDC ceramics. This structural change will impact the function of composite ceramics as fuel cell cathodes or oxygen separation membranes. © 2007 Materials Research Society.

Publication Date

6-29-2007

Publication Title

Materials Research Society Symposium Proceedings

Volume

972

Number of Pages

187-192

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

34250899094 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/34250899094

This document is currently not available here.

Share

COinS