Oxide growth characteristics, kinetics and mechanism of rutile formation on pure titanium

Mehrotra, S and Kalyan, D and Makineni, SK and Santra, S (2024) Oxide growth characteristics, kinetics and mechanism of rutile formation on pure titanium. In: Vacuum, 219 .

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Abstract

Isothermal oxidation of titanium results in the formation of rutile (TiO2) at temperatures of 600 °C – 1200 °C. Initial growth of TiO2 occurs linearly with an activation energy of 53 kJ/mol. Subsequent growth happens parabolically with an activation energy of 155 kJ/mol determined through a proposed quantitative oxide growth model. Inert particles were located at air/oxide interface, indicating oxygen ions to be dominant component for growth of TiO2. Crystal structure and defect chemistry of TiO2 suggests that oxygen diffuses through TiO2 via oxygen vacancies primarily. Temperature-dependent isothermal oxidation mechanism of titanium is proposed considering experimental results and thermodynamic arguments. © 2023 Elsevier Ltd

Item Type:	Journal Article
Publication:	Vacuum
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Activation energy; Crystal structure; Film growth; Growth kinetics; Isotherms; Oxide films; Oxide minerals; Titanium dioxide, Film growth kinetics; Growth characteristic; Growth mechanisms; Isothermal oxidations; Kinetics and mechanism; Oxide film growth; Oxide film growth kinetic; Oxide growth; Rutile formation; Titania, Free energy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	08 Dec 2023 11:11
Last Modified:	08 Dec 2023 11:11
URI:	https://eprints.iisc.ac.in/id/eprint/83329

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