Valence state of Ti in conductive nanowires in sapphire

Teruyasu Mizoguchi; Masaki Sakurai; Atsutomo Nakamura; Katsuyuki Matsunaga; Isao Tanaka; Takahisa Yamamoto; Yuichi Ikuhara

doi:10.1103/PhysRevB.70.153101

Valence state of Ti in conductive nanowires in sapphire

Teruyasu Mizoguchi, Masaki Sakurai, Atsutomo Nakamura, Katsuyuki Matsunaga, Isao Tanaka, Takahisa Yamamoto, Yuichi Ikuhara

Research output: Contribution to journal › Article

23 Citations (Scopus)

Abstract

In order to reveal the valence state of Ti in conductive nanowires in sapphire, near-edge x-ray-absorption fine structures (NEXAFS) were observed. From experimental and theoretical studies on NEXAFS of reference compounds including rutile, anatase, and Ti₂O₃, it was found that the valence state of Ti can be identified by regarding the positions of the spectral onset and the shoulder in the main peak of Ti-K NEXAFS. The valence states of Ti doped Al₂O₃ polycrystalline specimens which were annealed at oxidized and reduced atmospheres were determined to be +4 and +3, respectively. The solubility limit of Ti in Al₂O₃ polycrystal was found to be between 1000 ppm to 1.0% at the both atmospheres. The spectrum from Ti nanowires in sapphire has a lot of similarities to the reduced specimen, the valence state was therefore concluded to be +3.

Original language	English
Article number	153101
Pages (from-to)	153101-1-153101-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevB.70.153101
Publication status	Published - 2004 Oct 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Mizoguchi, T., Sakurai, M., Nakamura, A., Matsunaga, K., Tanaka, I., Yamamoto, T., & Ikuhara, Y. (2004). Valence state of Ti in conductive nanowires in sapphire. Physical Review B - Condensed Matter and Materials Physics, 70(15), 153101-1-153101-4. [153101]. https://doi.org/10.1103/PhysRevB.70.153101

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title = "Valence state of Ti in conductive nanowires in sapphire",

abstract = "In order to reveal the valence state of Ti in conductive nanowires in sapphire, near-edge x-ray-absorption fine structures (NEXAFS) were observed. From experimental and theoretical studies on NEXAFS of reference compounds including rutile, anatase, and Ti2O3, it was found that the valence state of Ti can be identified by regarding the positions of the spectral onset and the shoulder in the main peak of Ti-K NEXAFS. The valence states of Ti doped Al2O3 polycrystalline specimens which were annealed at oxidized and reduced atmospheres were determined to be +4 and +3, respectively. The solubility limit of Ti in Al2O3 polycrystal was found to be between 1000 ppm to 1.0% at the both atmospheres. The spectrum from Ti nanowires in sapphire has a lot of similarities to the reduced specimen, the valence state was therefore concluded to be +3.",

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AU - Mizoguchi, Teruyasu

AU - Sakurai, Masaki

AU - Nakamura, Atsutomo

AU - Matsunaga, Katsuyuki

AU - Tanaka, Isao

AU - Yamamoto, Takahisa

AU - Ikuhara, Yuichi

PY - 2004/10/1

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N2 - In order to reveal the valence state of Ti in conductive nanowires in sapphire, near-edge x-ray-absorption fine structures (NEXAFS) were observed. From experimental and theoretical studies on NEXAFS of reference compounds including rutile, anatase, and Ti2O3, it was found that the valence state of Ti can be identified by regarding the positions of the spectral onset and the shoulder in the main peak of Ti-K NEXAFS. The valence states of Ti doped Al2O3 polycrystalline specimens which were annealed at oxidized and reduced atmospheres were determined to be +4 and +3, respectively. The solubility limit of Ti in Al2O3 polycrystal was found to be between 1000 ppm to 1.0% at the both atmospheres. The spectrum from Ti nanowires in sapphire has a lot of similarities to the reduced specimen, the valence state was therefore concluded to be +3.

AB - In order to reveal the valence state of Ti in conductive nanowires in sapphire, near-edge x-ray-absorption fine structures (NEXAFS) were observed. From experimental and theoretical studies on NEXAFS of reference compounds including rutile, anatase, and Ti2O3, it was found that the valence state of Ti can be identified by regarding the positions of the spectral onset and the shoulder in the main peak of Ti-K NEXAFS. The valence states of Ti doped Al2O3 polycrystalline specimens which were annealed at oxidized and reduced atmospheres were determined to be +4 and +3, respectively. The solubility limit of Ti in Al2O3 polycrystal was found to be between 1000 ppm to 1.0% at the both atmospheres. The spectrum from Ti nanowires in sapphire has a lot of similarities to the reduced specimen, the valence state was therefore concluded to be +3.

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