Abstract
dc:description.abstract<p>"Calcium doped lanthanum chromite has suitable properties for use as a solid oxide fuel cell interconnect, but it is difficult to sinter. The purpose of this study was to develop methods of sintering this material in air at temperatures below 1500°C. The results are compiled into three papers.</p> <p>The first paper discusses the formation of pure and Ca doped lanthanum chromate (LaCrO<sub>4</sub>). This compound transforms to lanthanum chromite (LaCrO<sub>3</sub>) and calcium chromate (CaCrO<sub>4</sub>) between 600 and 700°C which subsequently form a solid solution, (La,Ca)CrO<sub>3</sub>. The surface segregation of Ca and phase separation of CaCrO<sub>4</sub> are discussed.</p> <p>The second paper addresses the sintering behavior of (La<sub>.6</sub>Ca<sub>.4</sub>)<sub>x</sub>CrO<sub>3</sub> where x is varied between 0.95 to 1.05. Densities of up to 93% of the theoretical were obtained by optimizing processing parameters. Compositions with x greater than or equal to unity showed the best sinterability.</p> <p>The solubility of CaCrO<sub>4</sub> in LaCrO<sub>3</sub> versus temperature was determined and is presented in the third paper. Powders which were heated slowly had a higher apparent solvus temperature than those which started as single phase solids and were heated quickly. The optimum composition for sintering was shown to contain between 25 and 30 mol% calcium"--Abstract, page iii.</p>
Degree
thesis:*- Name thesis:degree_name
- Ph. D. in Ceramic Engineering
- Grantor
- University of Missouri--Rolla
- Year dc:date.available
- 2016
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Carter, John David
Subjects
dc:subject × 1Identifiers
dc:identifier.*- Repository record dc:identifier
- https://scholarsmine.mst.edu/doctoral_dissertations/1002
- OAI identifier oai:identifier
- oai:scholarsmine.mst.edu:doctoral_dissertations-2004