Fabrication and microstructure of directionally solidified SrCe1 − xYxO3 − δ (x = 0.1, 0.2) high temperature proton conductors |
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Authors: | J. Ramí rez-Rico, M.J. L pez-Robledo, A.R. de Arellano-L pez, J. Martí nez-Fern ndez,A. Sayir |
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Affiliation: | aDepartamento de Física de la Materia Condensada-ICMSE, Universidad de Sevilla-CSIC, Apdo, 1065, 41080 Sevilla, Spain bNASA-Glenn Research Center, Lewis Field-21000 Brookpark Road-Mail Stop 106-1-Cleveland, OH 44135-3191, USA |
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Abstract: | SrCe1 − xYxO3 − δ (x = 0.1, 0.2) high temperature proton conductors (HTPC) have been fabricated by directional solidification using a laser-heated float zone (LHFZ) method. The resulting microstructures have been studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The LHFZ method produces a cellular microstructure consisting of crystalline cells embedded in an amorphous matrix, showing a strong biaxial texture. EBSD studies show that all the crystalline cells have their <0 0 1> axis as described in the cubic Pm3m prototype unit cell parallel to the growth direction. The observed microstructural features are explained in terms of the fabrication process. |
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Keywords: | Laser processing Perovskites Fuel cells Sr(Ce, Y)O3 Proton conduction |
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