Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1475811 | Journal of the European Ceramic Society | 2011 | 12 Pages |
Abstract
Nano-sized CSO (Ce0.80Sm0.20O2âδ) and CSCO (Ce0.79Sm0.20Cu0.01O2âδ) were synthesized by the PVA assisted combustion method, and then characterized by the structure of PVA-cation complexes and nano-powders, as well as mechanical and electrical performance after sintering. The results indicate that the PVA-cation complexes (PVA-(Ce3+,Sm3+) and PVA-(Ce3+,Sm3+,Cu2+)) were formed by coordinating metal cations to hydroxyl groups, as well as the COOâ1 group derived from the oxidation of PVA with NO3â1. Low temperatures (around 200 °C) caused intense combustion reactions, resulting in the direct crystallization of cubic fluorite nano-CSO (10-20 nm) and nano-CSCO (10-15 nm) crystals with homogeneous element distribution. This slight compositional modification of CSO by co-doping with 1 mol% CuO resulted in a significantly lowered densification temperature, as well as enhanced mechanical and electrical property. The strength improvement can be ascribed to the dense and fine-grained microstructure without normal grain coarsening, resulting in a transgranular-dominant fracture mode during strength testing.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yingchao Dong, Stuart Hampshire, Jian-er Zhou, Xinfa Dong, Bin Lin, Guangyao Meng,