Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-12-01T02:34:33.842Z Has data issue: false hasContentIssue false
  • English
  • Français

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:
[email protected], Michigan Technological University, Department Of Materials Science and Engineering, 1400 Townsend Dr, Houghton, MI, 49931, United States
Matthew Swanson
Affiliation:
[email protected], Michigan Technological University, Materials Science and Engineering, 1400 Townsend Drive, Houghton, MI, 49931, United States
Peter Moran
Affiliation:
[email protected], Michigan Technological University, Materials Science and Engineering, 1400 Townsend Drive, Houghton, MI, 49931, United States
Jakob Kuebler
Affiliation:
[email protected], Empa-Material Science and Technology, Duebendorf, N/A, Switzerland
Jayanta Kapat
Affiliation:
[email protected], University of Central Florida, Mechanical, Materials & Aerospace Engineering, Orlando, FL, 32816-2450, United States
Nina Orlovskaya
Affiliation:
[email protected], University of Central Florida, Mechanical, Materials & Aerospace Engineering, Orlando, FL, 32816-2450, United States
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Hwang, H. J., Moon, J W., Lee, S. and Lee, E., Journal of Power Sources 145, 243 (2005).Google Scholar
2. Wang, W. G. and Mogensen, M., Solid State Ionics 176, 457 (2005).Google Scholar
3. Murray, E. P., Sever, M. J. and Barnett, S.A., Solid State Ionics 148, 27 (2002).Google Scholar
4. Kharton, V. V., Kovalevsky, A.V., Viskup, A. P., Shaula, A. L., Figueiredo, F. M., Naumovich, E. N., Marques, and Marques, F. M. B., Solid State Ionics 160, 247 (2003).Google Scholar
5. Rosten, R., Koski, M. and Koppana, E., Journal of Undergraduate Materials Research 2, 38 (2006).Google Scholar