Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculations
In fusion environments, large scales of helium (He) atoms are produced by a radical transformation along with structural damage in structural materials, resulting in material swelling and degradation of physical properties. To understand its irradiation effects, this paper investigates the stability...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573323002413 |
| _version_ | 1797770031418834944 |
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| author | Obaid Obaidullah RuiXuan Zhao XiangCao Li ChuBin Wan TingTing Sui Xin Ju |
| author_facet | Obaid Obaidullah RuiXuan Zhao XiangCao Li ChuBin Wan TingTing Sui Xin Ju |
| author_sort | Obaid Obaidullah |
| collection | DOAJ |
| description | In fusion environments, large scales of helium (He) atoms are produced by a radical transformation along with structural damage in structural materials, resulting in material swelling and degradation of physical properties. To understand its irradiation effects, this paper investigates the stability, electronic structure, energetics, charge density distribution, PDOS and TDOS, and diffusion processes of He impurities in 6H-SiC materials. The formation energy indicates that a stable, favorable position for interstitial He is the HR site with the lowest energy of 2.40 eV. In terms of vacancy, the He atom initially prefers to substitute at pre-existing Si vacancy than C vacancy due to lower substitution energy. The minimum energy paths (MEPs) with migration energy barriers are also calculated for He impurity by interstitial and vacancy-mediated diffusion. Based on its calculated energy barriers, the most possible diffusion path includes the exchange of interstitial and vacancy sites with effective migration energies ranging from 0.101 eV to 1.0 eV. Our calculation provides a better understanding of the stabilization and diffusion behaviors of He impurities in 6H-SiC materials. |
| first_indexed | 2024-03-12T21:17:32Z |
| format | Article |
| id | doaj.art-1f80ceb390c740bab9c429fd476a0768 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-03-12T21:17:32Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
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| series | Nuclear Engineering and Technology |
| spelling | doaj.art-1f80ceb390c740bab9c429fd476a07682023-07-29T04:34:58ZengElsevierNuclear Engineering and Technology1738-57332023-08-0155828792888Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculationsObaid Obaidullah0RuiXuan Zhao1XiangCao Li2ChuBin Wan3TingTing Sui4Xin Ju5Physics Department, University of Science and Technology Beijing, 100083, ChinaPhysics Department, University of Science and Technology Beijing, 100083, ChinaCollege of Science, Xi'an Aeronautical Institute, 710077, ChinaPhysics Department, University of Science and Technology Beijing, 100083, China; Corresponding author.Physics Department, University of Science and Technology Beijing, 100083, ChinaPhysics Department, University of Science and Technology Beijing, 100083, China; Corresponding author.In fusion environments, large scales of helium (He) atoms are produced by a radical transformation along with structural damage in structural materials, resulting in material swelling and degradation of physical properties. To understand its irradiation effects, this paper investigates the stability, electronic structure, energetics, charge density distribution, PDOS and TDOS, and diffusion processes of He impurities in 6H-SiC materials. The formation energy indicates that a stable, favorable position for interstitial He is the HR site with the lowest energy of 2.40 eV. In terms of vacancy, the He atom initially prefers to substitute at pre-existing Si vacancy than C vacancy due to lower substitution energy. The minimum energy paths (MEPs) with migration energy barriers are also calculated for He impurity by interstitial and vacancy-mediated diffusion. Based on its calculated energy barriers, the most possible diffusion path includes the exchange of interstitial and vacancy sites with effective migration energies ranging from 0.101 eV to 1.0 eV. Our calculation provides a better understanding of the stabilization and diffusion behaviors of He impurities in 6H-SiC materials.http://www.sciencedirect.com/science/article/pii/S17385733230024136H-SiCDFT calculationsHelium impuritiesDiffusion behaviorsElectronic structure |
| spellingShingle | Obaid Obaidullah RuiXuan Zhao XiangCao Li ChuBin Wan TingTing Sui Xin Ju Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculations Nuclear Engineering and Technology 6H-SiC DFT calculations Helium impurities Diffusion behaviors Electronic structure |
| title | Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculations |
| title_full | Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculations |
| title_fullStr | Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculations |
| title_full_unstemmed | Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculations |
| title_short | Theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6H-SiC by DFT calculations |
| title_sort | theoretical studies on the stabilization and diffusion behaviors of helium impurities in 6h sic by dft calculations |
| topic | 6H-SiC DFT calculations Helium impurities Diffusion behaviors Electronic structure |
| url | http://www.sciencedirect.com/science/article/pii/S1738573323002413 |
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