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Sintering Behavior and Phase Characterisation of Composite Perovskite/Fluorite Ceramics for Intermediate Temperature SOFCs and Oxygen Separation Membranes

Published online by Cambridge University Press:  26 February 2011

Natee Tangtrakam ,
Matthew Swanson ,
Peter Moran ,
Jakob Kuebler ,
Jayanta Kapat  and
Nina Orlovskaya
Natee Tangtrakam
Affiliation:
ntangtra@mtu.edu, Michigan Technological University, Department Of Materials Science and Engineering, 1400 Townsend Dr, Houghton, MI, 49931, United States
Matthew Swanson
Affiliation:
mmswanso@mtu.edu, Michigan Technological University, Materials Science and Engineering, 1400 Townsend Drive, Houghton, MI, 49931, United States
Peter Moran
Affiliation:
pdmoran@mtu.edu, Michigan Technological University, Materials Science and Engineering, 1400 Townsend Drive, Houghton, MI, 49931, United States
Jakob Kuebler
Affiliation:
Jakob.Kuebler@empa.ch, Empa-Material Science and Technology, Duebendorf, N/A, Switzerland
Jayanta Kapat
Affiliation:
jkapat@pegasus.cc.ucf.edu, University of Central Florida, Mechanical, Materials & Aerospace Engineering, Orlando, FL, 32816-2450, United States
Nina Orlovskaya
Affiliation:
norlovsk@mtu.edu, University of Central Florida, Mechanical, Materials & Aerospace Engineering, Orlando, FL, 32816-2450, United States
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Abstract

The sintering behavior and structural changes of fluorite Gd0.2Ce0.8O2-δ(GDC) with one of three perovskites: LaMnO3 (LMO), (La0.7Sr0.3)0.98MnO3 (LSM) and La0.6Sr0.4Fe0.8Co0.2O3 (LSFC) composite ceramics were studied. Sintering was carried out for two hours at five different temperatures: 1100°C, 1200°C, 1300°C, 1400°C, and 1500°C. The highest sinterability has been found in LSFC + GDC. LSM + GDC appear to undergo two-step sintering mechanisms. Of all types of ceramics, only sintered LMO experiences a phase change, from rhombohedral R C to orthorhombic Pnma structure, with respect to its powder phase at sintering temperatures ≥1200 °C. 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 a fuel cell cathode, or oxygen separation membranes.

Keywords

ceramicx-ray diffraction (XRD)sintering
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA03-07
Copyright
Copyright © Materials Research Society 2007

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