Abstract
The crystal structure, sintering characteristics, electrical conductivity and thermal expansion of Gd x Ti 2O 7− δ pyrochlores (1.72≤ x≤2.10) have been studied as potential electrolytes in high-temperature solid oxide fuel cells (SOFC). It was found that the A-site deficiency of Gd x Ti 2O 7− δ with cubic symmetry showed a wide region of 1.72< x<2.03. A-site vacancies promoted the sintering characteristics of these materials. Electrical conductivity of the pyrochlores with A-site vacancies was lower than that of Gd x Ti 2O 7 in air although the reverse was observed in reducing atmospheres, due to the appearance of electronic conduction. Average linear thermal expansion coefficients of Gd x Ti 2O 7− δ pyrochlores decreased with increasing A-site vacancies. The difference between the TEC in air and in a H 2 atmosphere had a tendency to increase with increasing A-site vacancies.
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