Abstract
We measured stress, temperature and dopant concentration dependences of Raman spectra in rare-earth-doped ceria to improve stress conditions evaluation method in operated solid oxide fuel cells (SOFCs) based on micro Raman scattering spectroscopy, which used the shift of ceria F2g vibration mode Raman peak. In addition to peak shift, we newly focused on the dependences of peak width, i.e. full width half maximum (FWHM). Considering measurement accuracy and predicted stress conditions in operated SOFCs, FWHM was more sensitive to temperature and dopant concentration than peak position. Consequently, the method was improved to evaluate not only stress conditions but also dopant concentration and temperature with high spatial resolution. We demonstrated this method using the model cells of conventional anode-supported type SOFCs, and the results indicated that stress and dopant concentration were distributed in the cell over measurement error. Especially, standard deviation of stress value sometimes reached 30 % of stress values.
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