Effect of aliovalent dopants on the kinetics of spinodal decomposition in rutile-type TiO2-VO2

Makoto Ogata, Kenji Kadowaki, Masataka Ijiri, Yoshito Takemoto, Kensei Terashima, Takanori Wakita, Takayoshi Yokoya, Yuji Muraoka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effects of aliovalent dopants on the kinetics of spinodal decomposition in a rutile-type TiO2-VO2 system were studied by means of x-ray diffraction and transmission electron microscopy. In this study, as-prepared polycrystalline samples were annealed at 673 k inside the spinodal. For undoped samples, phase decomposition occurred along the [001] direction, and a lamellar structure formed on the nanometer length scale. The phase decomposition kinetics in this system were sensitive to the type of aliovalent dopant; the decomposition rate in a sample doped with Al2O3 was more than one order of magnitude higher than a sample doped with Nb2O5. These observations could be explained on the basis of the premise that cation interstitial mobility is greater than cation vacancy mobility. The obtained results are consistent with those for a TiO2-SnO2 system, indicating that phase separation in both rutile-type oxide systems can be interpreted through a common framework.

Original languageEnglish
Pages (from-to)3177-3183
Number of pages7
JournalJournal of the European Ceramic Society
Volume37
Issue number9
DOIs
Publication statusPublished - Aug 1 2017

Fingerprint

Spinodal decomposition
Doping (additives)
Decomposition
Kinetics
Cations
Positive ions
Lamellar structures
Phase separation
Oxides
Vacancies
Diffraction
Transmission electron microscopy
X rays
titanium dioxide

Keywords

  • Aliovalent dopant
  • Kinetics
  • Rutile-type oxide
  • Spinodal decomposition
  • TiO-VO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Effect of aliovalent dopants on the kinetics of spinodal decomposition in rutile-type TiO2-VO2 . / Ogata, Makoto; Kadowaki, Kenji; Ijiri, Masataka; Takemoto, Yoshito; Terashima, Kensei; Wakita, Takanori; Yokoya, Takayoshi; Muraoka, Yuji.

In: Journal of the European Ceramic Society, Vol. 37, No. 9, 01.08.2017, p. 3177-3183.

Research output: Contribution to journalArticle

@article{4b74291a08bf4009aabb1b81bd912740,
title = "Effect of aliovalent dopants on the kinetics of spinodal decomposition in rutile-type TiO2-VO2",
abstract = "The effects of aliovalent dopants on the kinetics of spinodal decomposition in a rutile-type TiO2-VO2 system were studied by means of x-ray diffraction and transmission electron microscopy. In this study, as-prepared polycrystalline samples were annealed at 673 k inside the spinodal. For undoped samples, phase decomposition occurred along the [001] direction, and a lamellar structure formed on the nanometer length scale. The phase decomposition kinetics in this system were sensitive to the type of aliovalent dopant; the decomposition rate in a sample doped with Al2O3 was more than one order of magnitude higher than a sample doped with Nb2O5. These observations could be explained on the basis of the premise that cation interstitial mobility is greater than cation vacancy mobility. The obtained results are consistent with those for a TiO2-SnO2 system, indicating that phase separation in both rutile-type oxide systems can be interpreted through a common framework.",
keywords = "Aliovalent dopant, Kinetics, Rutile-type oxide, Spinodal decomposition, TiO-VO",
author = "Makoto Ogata and Kenji Kadowaki and Masataka Ijiri and Yoshito Takemoto and Kensei Terashima and Takanori Wakita and Takayoshi Yokoya and Yuji Muraoka",
year = "2017",
month = "8",
day = "1",
doi = "10.1016/j.jeurceramsoc.2017.03.039",
language = "English",
volume = "37",
pages = "3177--3183",
journal = "Journal of the European Ceramic Society",
issn = "0955-2219",
publisher = "Elsevier BV",
number = "9",

}

TY - JOUR

T1 - Effect of aliovalent dopants on the kinetics of spinodal decomposition in rutile-type TiO2-VO2

AU - Ogata, Makoto

AU - Kadowaki, Kenji

AU - Ijiri, Masataka

AU - Takemoto, Yoshito

AU - Terashima, Kensei

AU - Wakita, Takanori

AU - Yokoya, Takayoshi

AU - Muraoka, Yuji

PY - 2017/8/1

Y1 - 2017/8/1

N2 - The effects of aliovalent dopants on the kinetics of spinodal decomposition in a rutile-type TiO2-VO2 system were studied by means of x-ray diffraction and transmission electron microscopy. In this study, as-prepared polycrystalline samples were annealed at 673 k inside the spinodal. For undoped samples, phase decomposition occurred along the [001] direction, and a lamellar structure formed on the nanometer length scale. The phase decomposition kinetics in this system were sensitive to the type of aliovalent dopant; the decomposition rate in a sample doped with Al2O3 was more than one order of magnitude higher than a sample doped with Nb2O5. These observations could be explained on the basis of the premise that cation interstitial mobility is greater than cation vacancy mobility. The obtained results are consistent with those for a TiO2-SnO2 system, indicating that phase separation in both rutile-type oxide systems can be interpreted through a common framework.

AB - The effects of aliovalent dopants on the kinetics of spinodal decomposition in a rutile-type TiO2-VO2 system were studied by means of x-ray diffraction and transmission electron microscopy. In this study, as-prepared polycrystalline samples were annealed at 673 k inside the spinodal. For undoped samples, phase decomposition occurred along the [001] direction, and a lamellar structure formed on the nanometer length scale. The phase decomposition kinetics in this system were sensitive to the type of aliovalent dopant; the decomposition rate in a sample doped with Al2O3 was more than one order of magnitude higher than a sample doped with Nb2O5. These observations could be explained on the basis of the premise that cation interstitial mobility is greater than cation vacancy mobility. The obtained results are consistent with those for a TiO2-SnO2 system, indicating that phase separation in both rutile-type oxide systems can be interpreted through a common framework.

KW - Aliovalent dopant

KW - Kinetics

KW - Rutile-type oxide

KW - Spinodal decomposition

KW - TiO-VO

UR - http://www.scopus.com/inward/record.url?scp=85016211671&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85016211671&partnerID=8YFLogxK

U2 - 10.1016/j.jeurceramsoc.2017.03.039

DO - 10.1016/j.jeurceramsoc.2017.03.039

M3 - Article

AN - SCOPUS:85016211671

VL - 37

SP - 3177

EP - 3183

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

SN - 0955-2219

IS - 9

ER -