Preparation of nanocrystalline Gd2Zr2O7 from mechanically activated coprecipitated precursor
| Autor: | V. N. Nevedomskii, V. Yu. Vinogradov, Alexander M. Kalinkin, E. V. Kalinkina |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Gadolinium chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Industrial and Manufacturing Engineering Zirconate law.invention chemistry.chemical_compound law Materials Chemistry Calcination Cubic zirconia Carbonization General Chemistry 021001 nanoscience & nanotechnology Nanocrystalline material 0104 chemical sciences Chemical engineering chemistry Hydroxide 0210 nano-technology BET theory |
| Zdroj: | Chemical Papers. 74:1161-1170 |
| ISSN: | 1336-9075 2585-7290 |
| Popis: | In this study, the effect of mechanical activation of coprecipitated hydroxide precursor on synthesis of gadolinium zirconate Gd2Zr2O7 has been studied. Mechanical activation of the precursor has been performed in an AGO-2 laboratory centrifugal-planetary mill at a centrifugal factor of 20 g with zirconia vials and balls. Particular attention has been given to carbonization of the as-prepared and mechanically activated precursors due to reaction with atmospheric carbon dioxide and their decarbonization in the course of calcination. The removal of the volatile components (H2O and CO2) from the as-prepared and mechanically activated precursors can be achieved by calcination at 1100–1200 °C for 3 h. Calcination of the as-prepared and mechanically activated precursors in the range of 700–1200 °C results in the formation of nanocrystalline fluorite-type Gd2Zr2O7. Gadolinium zirconate prepared from the mechanically activated precursor exhibits 4–9 times larger BET surface area relative to that of Gd2Zr2O7 synthesized at the same calcination conditions from the as-prepared precursor. In particular, this is beneficial for preparation of nanostructured dense ceramic materials with enhanced properties. |
| Databáze: | OpenAIRE |
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