Investigation of the thermal decomposition of a new titanium dioxide material: TA/MS and EPR study

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F16%3AA1701HP3" target="_blank" >RIV/61988987:17310/16:A1701HP3 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Investigation of the thermal decomposition of a new titanium dioxide material: TA/MS and EPR study
Original language description
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.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CA - Inorganic chemistry
OECD FORD branch
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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