Fast synthesis of NaNbO3 and K0.5Na0.5NbO3 by microwave hydrothermal method
| Autor: | Rigoberto López-Juárez, R. Castañeda-Guzmán, M.E. Villafuerte-Castrejón |
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| Rok vydání: | 2014 |
| Předmět: |
Diffraction
Materials science Scanning electron microscope Process Chemistry and Technology Sodium Analytical chemistry Mineralogy chemistry.chemical_element Hydrothermal circulation Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake chemistry Phase (matter) Materials Chemistry Ceramics and Composites symbols Raman spectroscopy Microwave Natural bond orbital |
| Zdroj: | Ceramics International. 40:14757-14764 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2014.06.065 |
| Popis: | Synthesis of sodium and potassium–sodium niobates (NaNbO 3 and K 0.5 Na 0.5 NbO 3 ) was achieved by reducing the reaction time via microwave-assisted hydrothermal route. Sodium niobate was synthesized at 180 °C for 15 min using NaOH 6 M. During the synthesis of KNN at 180 °C, the K 4 Na 4 Nb 6 O 19 –9H 2 O intermediate phase appeared. By increasing the temperature to 200 and 220 °C, the pure KNN phase was obtained. Potassium–sodium niobate was prepared at 220 °C for 15 min using KOH/NaOH 8 and 10 M. These results were confirmed by X-ray diffraction, Scanning Electron Microscopy and Raman spectroscopy. The NaNbO 3 and K 0.5 Na 0.5 NbO 3 powders consisted of agglomerated pseudo-cubic crystals. |
| Databáze: | OpenAIRE |
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