Abstract
We present multilayer formation via spinodal decomposition in rutile TiO2-VO2 (TVO) epitaxial films on sapphire substrates. (001)- and (101)-oriented TVO solid-solution films are grown epitaxially on TiO2/Al2O3 using a pulsed laser deposition technique and annealed inside the spinodal region. X-ray diffraction measurements and scanning transmission electron microscopy (STEM) observations show that the films are phase-separated along the [001] direction and lamellar structures are formed in a parallel or slanted direction to the sapphire substrates depending on the film orientation. The results indicate the multilayer formation via spinodal decomposition in the TVO films. STEM investigations also reveal a relatively high Ti concentration in the decomposed phases, reflecting the influence of lattice deformation on the phase decomposition in the films. Our work shows that spinodal decomposition is a promising approach for the formation of a multilayer structure in TVO films and helps deepen understanding the spinodal decomposition in TVO system.
Original language | English |
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Pages (from-to) | 5043-5050 |
Number of pages | 8 |
Journal | Journal of the European Ceramic Society |
Volume | 38 |
Issue number | 15 |
DOIs | |
Publication status | Published - Dec 2018 |
Keywords
- Formation
- Lattice deformation
- Multilayer
- Sapphire substrate
- Spinodal decomposition
- TiO-VO film
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry