Photo-Stimulated EPR Spectroscopy of Oxygen Defects in a Rutile (TiO2) Crystal Irradiated with Ar Ions

IF 0.48 Q4 Physics and Astronomy
A. A. Sukhanov, V. F. Valeev, V. I. Nuzhdin, R. I. Khaibullin
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引用次数: 0

Abstract

The electron paramagnetic resonance (EPR) spectra of oxygen-deficient rutile TiO2 – δ under photoexcitation at low temperatures in the range of 15–40 K were measured. Excluding the early described Ti3+ centers, concentration of which is independent of photoexcitation, new EPR signals appear at various wavelengths (λ) of photoexcitation taken in the range 400–460 nm. From the analysis of the EPR data we conclude that the observed EPR signals can be attributed to either the positive-charged oxygen vacancies (\({\text{V}}_{{\text{O}}}^{ + }\)) with S = 1/2 (upon photoexcitation with λ ≤ 420 nm only), or more complex defects such as positively-charged [Ti3+–VO]+ pairs with S = 1/2 and neutral complexes of (Ti3+–VO–Ti3+) with S = 1. The latter is observed upon photoexcitation with a wavelength above 420 nm.

Abstract Image

Abstract Image

用氩离子辐照金红石(TiO2)晶体中氧缺陷的光刺激 EPR 光谱分析
摘要 在 15-40 K 的低温范围内,测量了缺氧金红石 TiO2 - δ 在光激发下的电子顺磁共振(EPR)光谱。除去早期描述的 Ti3+ 中心(其浓度与光激发无关),在 400-460 纳米范围内的不同光激发波长 (λ) 下出现了新的 EPR 信号。通过对 EPR 数据的分析,我们得出结论:所观察到的 EPR 信号可归因于 S = 1/2 的正电荷氧空位(\({\text{V}}_{\text{O}}^{ + }\ )(仅在 λ ≤ 420 纳米的光激发条件下),或更复杂的缺陷,如 S = 1/2 的正电荷 [Ti3+-VO]+ 对和 S = 1 的 (Ti3+-VO-Ti3+) 中性复合物。后者是在波长高于 420 纳米的光激发下观察到的。
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来源期刊
Bulletin of the Russian Academy of Sciences: Physics
Bulletin of the Russian Academy of Sciences: Physics Physics and Astronomy-Physics and Astronomy (all)
CiteScore
0.90
自引率
0.00%
发文量
251
期刊介绍: Bulletin of the Russian Academy of Sciences: Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It presents full-text articles (regular,  letters  to  the editor, reviews) with the most recent results in miscellaneous fields of physics and astronomy: nuclear physics, cosmic rays, condensed matter physics, plasma physics, optics and photonics, nanotechnologies, solar and astrophysics, physical applications in material sciences, life sciences, etc. Bulletin of the Russian Academy of Sciences: Physics  focuses on the most relevant multidisciplinary topics in natural sciences, both fundamental and applied. Manuscripts can be submitted in Russian and English languages and are subject to peer review. Accepted articles are usually combined in thematic issues on certain topics according to the journal editorial policy. Authors featured in the journal represent renowned scientific laboratories and institutes from different countries, including large international collaborations. There are globally recognized researchers among the authors: Nobel laureates and recipients of other awards, and members of national academies of sciences and international scientific societies.
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