Multilayer formation via spinodal decomposition in TiO2-VO2 epitaxial films on sapphire substrates

Yuka Matsuura, Fumiya Yoshii, Tsubasa Otsuka, Kenji Kadowaki, Masataka Ijiri, Yoshito Takemoto, Kensei Terashima, Takanori Wakita, Takayoshi Yokoya, Yuji Muraoka

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 languageEnglish
JournalJournal of the European Ceramic Society
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

Spinodal decomposition
Aluminum Oxide
Epitaxial films
Sapphire
Multilayers
Substrates
Transmission electron microscopy
Scanning electron microscopy
Lamellar structures
Pulsed laser deposition
Solid solutions
Decomposition
X ray diffraction

Keywords

  • Formation
  • Lattice deformation
  • Multilayer
  • Sapphire substrate
  • Spinodal decomposition
  • TiO-VO film

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Multilayer formation via spinodal decomposition in TiO2-VO2 epitaxial films on sapphire substrates. / Matsuura, Yuka; Yoshii, Fumiya; Otsuka, Tsubasa; Kadowaki, Kenji; Ijiri, Masataka; Takemoto, Yoshito; Terashima, Kensei; Wakita, Takanori; Yokoya, Takayoshi; Muraoka, Yuji.

In: Journal of the European Ceramic Society, 01.01.2018.

Research output: Contribution to journalArticle

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AU - Matsuura, Yuka

AU - Yoshii, Fumiya

AU - Otsuka, Tsubasa

AU - Kadowaki, Kenji

AU - Ijiri, Masataka

AU - Takemoto, Yoshito

AU - Terashima, Kensei

AU - Wakita, Takanori

AU - Yokoya, Takayoshi

AU - Muraoka, Yuji

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N2 - 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.

AB - 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.

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