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Meeting Materials Science & Technology 2019
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title In-situ Observations of Phase Transformations on Individual Particles of a Cu/Fe Oxygen Carrier during High-temperature Oxidation and Reduction Cycles
Author(s) William Hunter Harrison Nealley, Anna Nakano, Jinichiro Nakano, Melissa K. Santala, James P. Bennett
On-Site Speaker (Planned) William Hunter Harrison Nealley
Abstract Scope Chemical looping combustion exposes an oxygen carrier material to adverse environments that include high temperatures, oxidation/reduction cycling, and mechanical stresses. In this study, an alumina-supported Cu/Fe spinel oxygen carrier was studied using an environmental confocal scanning laser microscope. Image measurements of individual particles were collected in-situ during repeated exposure to oxidizing and reducing conditions at 800C, with exposure times ranging from 3 to 12 hours. Analysis of in-situ data was used with ex-situ SEM examination of quenched particles surfaces as well as X-ray diffraction of bulk samples to characterize phase changes occurring during repeated exposure to oxidizing and reducing conditions, both internally and on the surface of the particle. The physical and chemical alteration of the surfaces during exposure and the material’s ability to exchange oxygen will be discussed. With repeated redox cycling; gradual segregation of Cu and Fe phases, expansion of the sample, and microstructure sintering were noted.
Proceedings Inclusion? Definite: At-meeting proceedings

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In-situ Observations of Phase Transformations on Individual Particles of a Cu/Fe Oxygen Carrier during High-temperature Oxidation and Reduction Cycles
In-situ Phase Diagram Determination of the HfO2-Ta2O5-TiO2 Ternary Up to 3000 ˚C
In-situ X-ray Characterization of Phase Evolution during Solid-state Synthesis of Multicomponent Systems
In Situ Investigation of Stress-Induced Martensitic Transformation in Granular Shape Memory Ceramics
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Phase Transformations in High-entropy, Lanthanide Oxides
Phase Transitions in Hollandite Oxides with Nanoscale Chemical Ordering
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Single Phase Spinel Produced from Powders of Alumina and Magnesia in Reactive Flash Sintering
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Thermal Expansion and Phase Transformation Mechanism in the Lanthanide Di-titanate System
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