Bi-Arrhenius Diffusion and Surface Trapping of Li+8 in Rutile TiO2
We report measurements of the diffusion rate of isolated ion-implanted Li+8 within ∼120 nm of the surface of oriented single-crystal rutile TiO2 using a radiotracer technique. The α particles from the Li8 decay provide a sensitive monitor of the distance from the surface and how the depth profile o...
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| Veröffentlicht in: | Physical review letters 2019-08, Vol.123 (9), p.1 |
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| creator | Chatzichristos, A McFadden, R M L Dehn, M H Dunsiger, S R Fujimoto, D Karner, V L McKenzie, I Morris, G D Pearson, M R Stachura, M Sugiyama, J Ticknor, J O MacFarlane, W A Kiefl, R F |
| description | We report measurements of the diffusion rate of isolated ion-implanted Li+8 within ∼120 nm of the surface of oriented single-crystal rutile TiO2 using a radiotracer technique. The α particles from the Li8 decay provide a sensitive monitor of the distance from the surface and how the depth profile of Li8 evolves with time. The main findings are that the implanted Li+ diffuses and traps at the (001) surface. The T dependence of the diffusivity is described by a bi-Arrhenius expression with activation energies of 0.3341(21) eV above 200 K, whereas at lower temperatures it has a much smaller barrier of 0.0313(15) eV. We consider possible origins for the surface trapping, as well the nature of the low-T barrier. |
| doi_str_mv | 10.1103/PhysRevLett.123.095901 |
| format | Article |
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The α particles from the Li8 decay provide a sensitive monitor of the distance from the surface and how the depth profile of Li8 evolves with time. The main findings are that the implanted Li+ diffuses and traps at the (001) surface. The T dependence of the diffusivity is described by a bi-Arrhenius expression with activation energies of 0.3341(21) eV above 200 K, whereas at lower temperatures it has a much smaller barrier of 0.0313(15) eV. We consider possible origins for the surface trapping, as well the nature of the low-T barrier.</description><identifier>ISSN: 0031-9007</identifier><identifier>EISSN: 1079-7114</identifier><identifier>DOI: 10.1103/PhysRevLett.123.095901</identifier><language>eng</language><publisher>College Park: American Physical Society</publisher><subject>Alpha particles ; Alpha rays ; Crystal structure ; Dependence ; Diffusion rate ; Particle decay ; Radioactive tracers ; Rutile ; Single crystals ; Titanium dioxide ; Trapping</subject><ispartof>Physical review letters, 2019-08, Vol.123 (9), p.1</ispartof><rights>Copyright American Physical Society Aug 30, 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Chatzichristos, A</creatorcontrib><creatorcontrib>McFadden, R M L</creatorcontrib><creatorcontrib>Dehn, M H</creatorcontrib><creatorcontrib>Dunsiger, S R</creatorcontrib><creatorcontrib>Fujimoto, D</creatorcontrib><creatorcontrib>Karner, V L</creatorcontrib><creatorcontrib>McKenzie, I</creatorcontrib><creatorcontrib>Morris, G D</creatorcontrib><creatorcontrib>Pearson, M R</creatorcontrib><creatorcontrib>Stachura, M</creatorcontrib><creatorcontrib>Sugiyama, J</creatorcontrib><creatorcontrib>Ticknor, J O</creatorcontrib><creatorcontrib>MacFarlane, W A</creatorcontrib><creatorcontrib>Kiefl, R F</creatorcontrib><title>Bi-Arrhenius Diffusion and Surface Trapping of Li+8 in Rutile TiO2</title><title>Physical review letters</title><description>We report measurements of the diffusion rate of isolated ion-implanted Li+8 within ∼120 nm of the surface of oriented single-crystal rutile TiO2 using a radiotracer technique. 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| ispartof | Physical review letters, 2019-08, Vol.123 (9), p.1 |
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| language | eng |
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| source | American Physical Society Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Alpha particles Alpha rays Crystal structure Dependence Diffusion rate Particle decay Radioactive tracers Rutile Single crystals Titanium dioxide Trapping |
| title | Bi-Arrhenius Diffusion and Surface Trapping of Li+8 in Rutile TiO2 |
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