Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> Films
We demonstrate the heteroepitaxial growth of phase-pure bronze-phase TiO<sub>2</sub> films using pulsed laser deposition on MgAl<sub>2</sub>O<sub>4</sub> single-crystal substrates. While the growth on cubic substrates with smaller lattice parameters favors the sta...
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/1/209 |
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| author | Andreas Herklotz Frank Herklotz Florina Stefania Rus |
| author_facet | Andreas Herklotz Frank Herklotz Florina Stefania Rus |
| author_sort | Andreas Herklotz |
| collection | DOAJ |
| description | We demonstrate the heteroepitaxial growth of phase-pure bronze-phase TiO<sub>2</sub> films using pulsed laser deposition on MgAl<sub>2</sub>O<sub>4</sub> single-crystal substrates. While the growth on cubic substrates with smaller lattice parameters favors the stabilization of an out-of-plane-oriented anatase phase, and the use of substrates with larger lattice parameters leads to formation of the rutile phase, MgAl<sub>2</sub>O<sub>4</sub> lies in a narrow intermediate range where the bronze phase is stabilized. X-ray diffraction shows that the b-axis is oriented out-of-plane, while the a–c lattice plane lies within the film plane. The bronze films show twinned domains due to their monoclinic structure that are aligned along all four in-plane directions of the MgAl<sub>2</sub>O<sub>4</sub> lattice. In a subsequent step, TiO<sub>2</sub> films are grown on top of MgAl<sub>2</sub>O<sub>4</sub>-buffered MgO single crystals in order to demonstrate a route to stabilize the bronze phase on a larger variety of substrates. The growth of bronze-type TiO<sub>2</sub> films with the unique, open, one-dimensional framework aligned along the film normally may allow for the investigation of its basic functional properties related to ion diffusion that cannot otherwise be studied easily in other crystal forms. |
| first_indexed | 2024-03-11T10:09:18Z |
| format | Article |
| id | doaj.art-c9a5f0844d8a4e1c89354eaaa82ab058 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T10:09:18Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c9a5f0844d8a4e1c89354eaaa82ab0582023-11-16T14:52:10ZengMDPI AGApplied Sciences2076-34172022-12-0113120910.3390/app13010209Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> FilmsAndreas Herklotz0Frank Herklotz1Florina Stefania Rus2Institute of Physics, Martin-Luther-University Halle-Wittenberg, 06120 Halle, GermanyInstitute of Applied Physics, Technische Universität Dresden, 01069 Dresden, GermanyNational Institute for Research and Development in Electrochemistry and Condensed Matter, 300569 Timisoara, RomaniaWe demonstrate the heteroepitaxial growth of phase-pure bronze-phase TiO<sub>2</sub> films using pulsed laser deposition on MgAl<sub>2</sub>O<sub>4</sub> single-crystal substrates. While the growth on cubic substrates with smaller lattice parameters favors the stabilization of an out-of-plane-oriented anatase phase, and the use of substrates with larger lattice parameters leads to formation of the rutile phase, MgAl<sub>2</sub>O<sub>4</sub> lies in a narrow intermediate range where the bronze phase is stabilized. X-ray diffraction shows that the b-axis is oriented out-of-plane, while the a–c lattice plane lies within the film plane. The bronze films show twinned domains due to their monoclinic structure that are aligned along all four in-plane directions of the MgAl<sub>2</sub>O<sub>4</sub> lattice. In a subsequent step, TiO<sub>2</sub> films are grown on top of MgAl<sub>2</sub>O<sub>4</sub>-buffered MgO single crystals in order to demonstrate a route to stabilize the bronze phase on a larger variety of substrates. The growth of bronze-type TiO<sub>2</sub> films with the unique, open, one-dimensional framework aligned along the film normally may allow for the investigation of its basic functional properties related to ion diffusion that cannot otherwise be studied easily in other crystal forms.https://www.mdpi.com/2076-3417/13/1/209titanium dioxideTiO<sub>2</sub>(B)pulsed laser depositionsingle crystalMgAl<sub>2</sub>O<sub>4</sub>spinel |
| spellingShingle | Andreas Herklotz Frank Herklotz Florina Stefania Rus Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> Films Applied Sciences titanium dioxide TiO<sub>2</sub>(B) pulsed laser deposition single crystal MgAl<sub>2</sub>O<sub>4</sub> spinel |
| title | Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> Films |
| title_full | Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> Films |
| title_fullStr | Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> Films |
| title_full_unstemmed | Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> Films |
| title_short | Phase-Pure Epitaxial b-Axis-Oriented Bronze TiO<sub>2</sub> Films |
| title_sort | phase pure epitaxial b axis oriented bronze tio sub 2 sub films |
| topic | titanium dioxide TiO<sub>2</sub>(B) pulsed laser deposition single crystal MgAl<sub>2</sub>O<sub>4</sub> spinel |
| url | https://www.mdpi.com/2076-3417/13/1/209 |
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