Abstract
The process of nitridation of hydrated titanate wires was examined by thermal gravimetric (TG) analysis in an NH3/Ar (50/50 vol.%) gas mixture, X-ray diffraction (XRD) measurement, field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) observations and X-ray photoelectron spectroscopic (XPS) analysis. The nitridation of the hydrated titanate nanowires was accompanied by a two-stage weight loss. In the first stage, occurring in the temperature range of 50-400 °C, the hydrated titanate wires changed to anatase-type TiO2 nanoparticles with the releasing of H2O molecules. In the second stage, occurring in the temperature range of 700-1000 °C, the TiO2 nanoparticles were converted to rock-salt-type titanium oxynitride (TiNxOy) nanoparticles. Subsequently, the TiNxOy nanoparticles were sintered each other at around 1000 °C. Under a gas flow of 100% NH 3, the hydrated titanate wires were completely changed to TiN xOy particles at a temperature greater than 950 °C, which was maintained for 2 h. It is possible to fabricate needle-like TiN xOy particles by selecting thick hydrated titanate wires as the starting materials.
Original language | English |
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Pages (from-to) | 1813-1817 |
Number of pages | 5 |
Journal | Ceramics International |
Volume | 37 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2011 Aug |
Externally published | Yes |
Keywords
- Hydrated titanate
- Needle-like particles
- Nitridation
- Titanium oxynitride
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry