Formation of needle-like titanium oxynitride particles through nitridation of hydrated titanates

Hajime Kiyono; Tomoki Tsumura; Tateki Kiyo; Masahiro Toyoda; Shiro Shimada

doi:10.1016/j.ceramint.2011.03.003

Formation of needle-like titanium oxynitride particles through nitridation of hydrated titanates

Hajime Kiyono, Tomoki Tsumura, Tateki Kiyo, Masahiro Toyoda, Shiro Shimada

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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 (TiN_xO_y) nanoparticles. Subsequently, the TiN_xO_y 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 _xO_y particles at a temperature greater than 950 °C, which was maintained for 2 h. It is possible to fabricate needle-like TiN _xO_y particles by selecting thick hydrated titanate wires as the starting materials.

Original language	English
Pages (from-to)	1813-1817
Number of pages	5
Journal	Ceramics International
Volume	37
Issue number	6
DOIs	https://doi.org/10.1016/j.ceramint.2011.03.003
Publication status	Published - 2011 Aug 1
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

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@article{247b919a02654acb95a8020f4446e602,

title = "Formation of needle-like titanium oxynitride particles through nitridation of hydrated titanates",

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.",

keywords = "Hydrated titanate, Needle-like particles, Nitridation, Titanium oxynitride",

author = "Hajime Kiyono and Tomoki Tsumura and Tateki Kiyo and Masahiro Toyoda and Shiro Shimada",

year = "2011",

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doi = "10.1016/j.ceramint.2011.03.003",

language = "English",

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AU - Kiyono, Hajime

AU - Tsumura, Tomoki

AU - Kiyo, Tateki

AU - Toyoda, Masahiro

AU - Shimada, Shiro

PY - 2011/8/1

Y1 - 2011/8/1

N2 - 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.

AB - 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.

KW - Hydrated titanate

KW - Needle-like particles

KW - Nitridation

KW - Titanium oxynitride

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