Expansion on reduction of calcium doped lanthanum chromite

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Doped lanthanum chromites have been considered as interconnect materials for the solid oxide fuel cell (SOFC) because of their favorable chemical and electrical properties under both oxidizing and reducing environments. Several investigators have studied the materials properties of the doped lanthanum chromites to optimize their overall performance as an interconnect material. These properties include electrical conductivity, thermal expansion, sinterability, and chemical compatibility with other cell components. These properties are optimized by the amount of dopants substituted into chromite which are usually Ca or Sr. Figure 1 shows the range of values for these properties. Another important characteristic becoming more of ... continued below

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13 p.

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Carter, J. D.; Hendriksen, P. V. & Mogensen, M. July 1995.

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Description

Doped lanthanum chromites have been considered as interconnect materials for the solid oxide fuel cell (SOFC) because of their favorable chemical and electrical properties under both oxidizing and reducing environments. Several investigators have studied the materials properties of the doped lanthanum chromites to optimize their overall performance as an interconnect material. These properties include electrical conductivity, thermal expansion, sinterability, and chemical compatibility with other cell components. These properties are optimized by the amount of dopants substituted into chromite which are usually Ca or Sr. Figure 1 shows the range of values for these properties. Another important characteristic becoming more of a concern as investigators are building SOFC stacks is that doped lanthanum chromite expands when reduced in a low oxygen partial pressure (pO{sub 2}) (<10{sup -12} atm). Plates used to separate oxidizing and fuel gases can deform because of the pO{sub 2} gradient across the interconnect material. This presentation is a summary of work which will be presented at the Fourth International Symposium on Solid Oxide Fuel Cells. In this article, the possible causes of expansion on reduction of the interconnect will be discussed by using a two-dimensional crystal model. The biaxial strain of the stack is calculated under the assumption that the cell components are forced to remain planar. From this, the maximum stress buildup in the interconnect and electrolyte is estimated. In addition, the effects of thermal expansion mismatch and expansion on reduction of the interconnect are compared, and the optimum interconnect composition from a mechanical standpoint is reported.

Physical Description

13 p.

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OSTI as DE95013677

Source

  • `95 EPRI/GRI fuel cell workshop on fuel cell techhnology research and development, Irvine, CA (United States), 4-5 Apr 1995

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  • Other: DE95013677
  • Report No.: ANL/CMT/CP--85697
  • Report No.: CONF-9504191--1
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 90710
  • Archival Resource Key: ark:/67531/metadc793961

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  • July 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 4, 2016, 4:55 p.m.

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Carter, J. D.; Hendriksen, P. V. & Mogensen, M. Expansion on reduction of calcium doped lanthanum chromite, article, July 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc793961/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.