Influence of pH and Synthesis Duration on the Composition and Thermal Behavior of Hydrolysis Products of Lanthanum Nitrate
| Autor: | V. V. Avdin, Artem V. Bogdanov, Tatyana V. Mosunova |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
Materials science Lanthanum nitrate Mechanical Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Hydrolysis Mechanics of Materials Duration (music) Thermal General Materials Science Composition (visual arts) 0210 nano-technology Thermal analysis Sol-gel Nuclear chemistry |
| Zdroj: | Materials Science Forum. 946:150-155 |
| ISSN: | 1662-9752 |
| Popis: | The study investigates the hydrolysis products of lanthanum nitrate, obtained at various pH values and times of the hydrolytic agent addition. It has been found that the structure formation of lanthanum oxyhydroxide is accompanied by capturing the admixture ions, namely, the anions of the reactant salt and carbonate ions. It has been shown that thermal decomposition of the hydrolysis products proceeds in four stages for faster hydrolysis. If hydrolysis is slow, the intervals merge together into three stages of thermal decomposition. The hydrolysis products of lanthanum nitrate, heated up to 500...550 С, actually consist of lanthanum oxide containing nitrate and carbonate, chemically bonded to the oxide matrix, in its inner regions. The composition of the synthesized samples changes if pH varies. The minimal content of admixture ions can be observed at the synthesis pH > 10, if the time of the hydrolytic agent addition equals 24 h. The obtained results suggest that lanthanum nitrate can be used as a precursor for synthesis of structured lanthanum oxide. |
| Databáze: | OpenAIRE |
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