Size-dependent crystal structure and phase transitions in ZrO2-Sc2O3 nanomaterials for intermediate-temperature solid-oxide fuel cells
Because of their excellent ionic conductivity, the highest among all ZrO2-based materials, ZrO2-Sc2O3 ceramics have attracted great attention. They are considered promising candidates for solid electrolytes in intermediate temperature solid-oxide fuel cells. However, for T<600°C, they exhibits low-conductivity rhombohedral phases that affect their performance. In previous works, we demonstrated that these phases of poor properties can be avoided in nanomaterials. In this proposal, we plan to investigate by ND the crystal structure at room temperature of tetragonal (t',t") or cubic ZrO2-2 to 14 mol% Sc2O3 nanopowders with crystallite sizes of 20-25 nm, in order to analyze the O2- sublattice and determine the displacement of O2- anions from their ideal positions in the fluorite-like cubic phase. We are particularly interested in the case of the t"-form of the tetragonal phase, with exhibits a c/a ratio of unity. For selected compositions, we also plan to perform high-temperature ND studies in order to monitor the O2- sublattice in the t' --> t" and t" --> cubic transitions. In addition, pure ZrO2 nanopowders and ZrO2-Y2O3 solid solutions will be analyzed as reference materials.
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LAMAS Diego German; ABDALA Paula Macarena; ACUNA Leandro; CRAIEVICH ALDO; CUELLO Gabriel; C. A. López and PEDREGOSA Jose. (2012). Size-dependent crystal structure and phase transitions in ZrO2-Sc2O3 nanomaterials for intermediate-temperature solid-oxide fuel cells. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-511
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