Investigation of the thermal decomposition of a new titanium dioxide material
| Autor: | Monika Palkovská, Jan Šubrt, Václav Slovák, Vlasta Brezová, Jaroslav Boháček, Zuzana Barbieriková, Radek Fajgar |
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| Rok vydání: | 2016 |
| Předmět: |
Anatase
Materials science Inorganic chemistry Thermal decomposition chemistry.chemical_element 02 engineering and technology Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen 0104 chemical sciences law.invention chemistry.chemical_compound chemistry law Titanium dioxide Physical and Theoretical Chemistry Crystallization 0210 nano-technology Thermal analysis Titanium |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 125:1071-1078 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-016-5526-3 |
| Popis: | A new type of TiO2 material has been prepared from titanium(IV) oxysulfate via precipitation by cold ammonia solution and drying at room temperature. The structure remains unchanged during the preparation (controlled hydrolysis), and titania material with a similar rod-shaped structure is created. The decomposition process has been evaluated by TA/MS analysis as a three-step process. The first step was characterized by water and carbon dioxide loss, the second step is represented by the evolution of residual water and ammonia, and the third step is represented by a very sharp exothermic peak due to the phase transition (crystallization of amorphous phase to anatase) together with a small mass loss caused by evolution of oxygen and nitrous oxide. EPR spectra obtained in the temperature range 100–250 K confirmed the presence of Ti(III) ions and oxygen vacancies for the TiO2 precursor annealed up to 550 °C in a vacuum. Annealing to 500 °C resulted in the generation of paramagnetic Ti(III) centers and nitrogen species (·Nb and NO) in anatase lattice. |
| Databáze: | OpenAIRE |
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