Effect of the synthesis conditions of Ce0.9Gd0.1O1.95 powder on its morphology and characteristics of the oxygen ion-conducting ceramics obtained by spark plasma sintering
| Autor: | M. A. Esikov, Hidemi Kato, Alexander A. Matvienko, Dina V. Dudina, Rodion V. Belosludov, A.A. Sidelnikov, D.V. Maslennikov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Vapour pressure of water Oxide Spark plasma sintering 02 engineering and technology 01 natural sciences chemistry.chemical_compound Crystallinity 0103 physical sciences Materials Chemistry medicine Ceramic Dehydration 010302 applied physics Process Chemistry and Technology Thermal decomposition 021001 nanoscience & nanotechnology medicine.disease Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering chemistry visual_art Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Ceramics International. 47:2557-2564 |
| ISSN: | 0272-8842 |
| Popis: | In this work, Ce0.9Gd0.1O1.95 (10GDC) powders were synthesized by thermal decomposition of oxalate precursor crystals Ce1.8Gd0.2(C2O4)3·10H2O having a plate shape. The morphology of the oxide was found to be strongly influenced by the dehydration conditions of the precursor crystals. Dehydration in air at 125 °C led to the formation of the product in a pseudomorph form, retaining the shape of the precursor crystals and showing only slight dimensional changes. The formation of a pseudomorph was accompanied by a loss of crystallinity. When dehydration occurred at an increased water vapor pressure at the same temperature, a crystalline product formed having a significantly altered morphology. Unlike dehydration in air, after which the crystals retained their shape, an intensive shattering of the crystals occurred upon dehydration at an increased water vapor pressure. Structural transformations during dehydration were shown to determine the product morphology. The 10GDC powders with different textural characteristics were obtained by oxidative thermolysis (at 300 °C) of dehydration products. The oxide powders were sintered by spark plasma sintering at a temperature of 1100 °C and a pressure of 40 MPa. The microstructure, relative densities, and conductivities of the ceramic samples obtained from powders of two different morphologies were compared. The sintered ceramic samples had comparable grain size ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect