Date of Award

Spring 5-15-2026

Degree Type

Thesis

Degree Name

MS Physics

Department

Physics

Advisor

M. Alper Sahiner, Ph.D.

Advisor

M. Alper Sahiner, Ph.D.

Committee Member

Peter Morse, Ph. D.

Committee Member

Stephen Kelty, Ph.D.

Keywords

Physics, Phase Identification, Solid Oxide Fuel Cell, EXAFS, DFT, SEM

Abstract

Perovskite structured mixed ionic electronic conductor (MIEC) materials formed as films by metal-organic precursor deposition have excellent electrochemical performance in solid oxide cell (SOC) air electrode applications due to the large surface area provided by the manufacturing approach. MIEC films created by metal organic precursor deposition are often multi-phased due to low heat treatment temperatures and locally generated low oxygen partial pressures caused by the release of carbonaceous gases during the drying step of the fabrication process. In this work, we use extended x-ray absorption fine structure spectroscopy (EXAFS) to examine the phase contents of La0.8Sr0.2CoO3 (LSC82) and La0.6Sr0.4CoO3 (LSC64) films formed by metal organic precursor deposition after 100 hours of exposure to SOC operating temperatures of 800 °C. We then correlate these changes to the electrochemical performances of these electrodes. According to our results, both samples included ABO3-type R-3c trigonal, Pnma orthorhombic, and A2BO4-type I4/mmm tetragonal phases, and the electrochemical performances were strongly connected with the relative quantities of these phases.

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