Local structure of densified nanocrystalline Y-doped ceria
In nanometric ionic materials, when their grain size becomes comparable with the size of the space charge region (SCR), a non-negligible number of atoms is close to region influenced by the grain boundary field; this may modify their transport properties in a significant way. In CeO2 based electrolytes, the specific grain boundary resistivity is much larger than the corresponding bulk value. This proposal aims to study densified Y-doped ceria, with varying dopant content (from 2% to 30% in atoms) and with various grain sizes (obtained by changing the pressure/temperature conditions of High-pressure Field Assisted Rapid Sintering. Total scattering is the ideal technique, because local and average structure in these materials are very likely not coincident, and the very small grain size (below 20 nm) does not allow traditional crystallographic techniques.
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DAPIAGGI Monica; BERNASCONI Andrea; BRUNELLI Michela; CODURI Mauro; MAGLIA FILIPPO and SCAVINI Marco. (2013). Local structure of densified nanocrystalline Y-doped ceria. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-74
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