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Diffusion of oxygen in amorphous Al2O3, Ta2O5, and Nb2O5
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The self-diffusivity of oxygen in amorphous Al2O3 (a-Al2O3), a-Ta2O5, and a-Nb2O5 was investigated along with structural analysis in terms of pair distribution function (PDF). The low activation energy, ∼1.2 eV, for diffusion in the oxides suggests a single atomic jump of oxygen ions mediated via vacancy-like defects. However, the pre-exponential factor for a-Ta2O5 and a-Nb2O5 with lower bond energy was two orders of magnitude larger than that for a-Al2O3 with higher bond energy. PDF analyses revealed that the short-range configuration in a-Ta2O5 and a-Nb2O5 was more broadly distributed than that in a-Al2O3. Due to the larger variety of atomic configurations of a-Ta2O5 and a-Nb2O5, these oxides have a higher activation entropy for diffusion than a-Al2O3. The entropy term for diffusion associated with short-range structures was shown to be a dominant factor for diffusion in amorphous oxides.
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“In fact, oxygen diffusion in Ta2O5 is characterized by a larger activation energy ( ∼ 1.2 eV [17]) and by a smaller field acceleration factor, respectively determining a slower and more random diffusion process (the reduced dependence on the applied field makes easier for O to move radially driven by the local temperature and mutual Coulomb repulsion [14]).”
From Linking Conductive Filament Properties and Evolution to Synaptic Behavior of RRAM Devices for Neuromorphic Applications (2017) · cites this paper as [17]
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Metadata
- Authors
- Nakamura, R., Toda, T., Tsukui, S., Tane, M., Ishimaru, M., Suzuki, T., & Nakajima, H.
- Affiliations
- Osaka Prefecture University (JP)
- The Institute of Scientific and Industrial Research, The University of Osaka (JP)
- Kyushu Institute of Technology (JP)
- Foundation Wakasa Wan Energy Research Center (JP)
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 2014-07-15
- Volume
- 116
- Issue
- 3
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W2048014664
- Cited by
- 132
- References
- 36
- Citations by year
- 2026: 15 · 2025: 19 · 2024: 14 · 2023: 10 · 2022: 8 · 2021: 16 · 2020: 11 · 2019: 12 · 2018: 8 · 2017: 9 · 2016: 7 · 2015: 2 · 2014: 1
- FWCI
- 5.77
- Type
- journal article
- Language
- en
- Open access
- green
- omu.repo.nii.ac.jp
- Locations
- Journal of Applied Physics (publishedVersion)
- Institutional Repositories DataBase (IRDB) (submittedVersion)
- Osaka Prefecture University Repository (Osaka Prefecture University) (submittedVersion, cc-by-nc-nd)
- Topics
- Physical Sciences › Materials Science › Ceramics and Composites › Glass properties and applications
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Semiconductor materials and devices
- Physical Sciences › Materials Science › Materials Chemistry › Nuclear materials and radiation effects
- Keywords
- oxygen self-diffusion, amorphous oxides, amorphous Al2O3, amorphous Ta2O5, activation energy, vacancy-like defects, pair distribution function, short-range order, activation entropy, bond energy, pre-exponential factor
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