Anomolus shrinkage of lanthanum strontium manganite

Benjamin McCarthy, Harlan Andersen, Xaio Dong Zhou, Larry Pederson, Gregory Coffey, Prabhakar Singh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Anomalous shrinkage behavior of porous Sr-doped lanthanum manganite (La 1-xSr x) 1-y MnO 3+δ, or LSM, where x = 0.0 to 0.4) has been studied as a function of thermal cycling, oxygen partial pressure, and Sr dopant concentration. An anomalous shrinkage due to thermal cycling in doped lanthanum manganite perovskite has previously been reported in the temperature range of 600°C to 1000°C. 1,2 However, the shrinkage reported here was in a 150°C range. Shrinkage of LSM during PO 2 cycling between air (2×10 5ppm O 2) and N 2 (10ppm), was much less pronounced than that of thermal cycling in the same temperature range. The two cannot be directly compared due to the difference in cycling time. The effect of Sr dopant concentration on the shrinkage due to thermal cycling reached a maximum at a dopant level of 0.1. The postulated mechanism responsible for anomalous shrinkage is the metal ion vacancy gradient produced by the oxygen nonstoichiometry of LSM. Along with this gradient or driving force for metal ion vacancy diffusion; shrinkage also requires vacancy mobility or thermal excitation to advance the anomalous shrinkage.

Original languageEnglish
Title of host publicationCeramic Engineering and Science Proceedings
EditorsN.P. Bansal
Pages139-149
Number of pages11
Volume26
Edition4
Publication statusPublished - 2005
Externally publishedYes
Event29th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: 23 Jan 200528 Jan 2005

Other

Other29th International Conference on Advanced Ceramics and Composites
CountryUnited States
CityCocoa Beach, FL
Period23/1/0528/1/05

Fingerprint

Lanthanum
Strontium
Thermal cycling
Vacancies
Doping (additives)
Metal ions
Oxygen
manganite
Partial pressure
Perovskite
Temperature

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

McCarthy, B., Andersen, H., Zhou, X. D., Pederson, L., Coffey, G., & Singh, P. (2005). Anomolus shrinkage of lanthanum strontium manganite. In N. P. Bansal (Ed.), Ceramic Engineering and Science Proceedings (4 ed., Vol. 26, pp. 139-149)

Anomolus shrinkage of lanthanum strontium manganite. / McCarthy, Benjamin; Andersen, Harlan; Zhou, Xaio Dong; Pederson, Larry; Coffey, Gregory; Singh, Prabhakar.

Ceramic Engineering and Science Proceedings. ed. / N.P. Bansal. Vol. 26 4. ed. 2005. p. 139-149.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

McCarthy, B, Andersen, H, Zhou, XD, Pederson, L, Coffey, G & Singh, P 2005, Anomolus shrinkage of lanthanum strontium manganite. in NP Bansal (ed.), Ceramic Engineering and Science Proceedings. 4 edn, vol. 26, pp. 139-149, 29th International Conference on Advanced Ceramics and Composites, Cocoa Beach, FL, United States, 23/1/05.
McCarthy B, Andersen H, Zhou XD, Pederson L, Coffey G, Singh P. Anomolus shrinkage of lanthanum strontium manganite. In Bansal NP, editor, Ceramic Engineering and Science Proceedings. 4 ed. Vol. 26. 2005. p. 139-149
McCarthy, Benjamin ; Andersen, Harlan ; Zhou, Xaio Dong ; Pederson, Larry ; Coffey, Gregory ; Singh, Prabhakar. / Anomolus shrinkage of lanthanum strontium manganite. Ceramic Engineering and Science Proceedings. editor / N.P. Bansal. Vol. 26 4. ed. 2005. pp. 139-149
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