Non-stoichiometry, electrical properties, and cation diffusion in highly non-stoichiometric Co1-xO-II. Modelling the defect structure†

K. Persels Constant; T. O. Mason; J. L. Routbort

doi:10.1016/0022-3697(92)90176-E

Non-stoichiometry, electrical properties, and cation diffusion in highly non-stoichiometric Co_1-xO-II. Modelling the defect structure†

K. Persels Constant^*, T. O. Mason, J. L. Routbort

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

The defect structure of highly non-stoichometric Co_1-xO is examined by fitting non-stoichiometry, electrical properties and cation diffusion data with various models. The ideal point defect model, the generalized cluster model and Debye-Huckel theory model for isolated vacancies are all shown to be inadequate in describing the properties dependence on oxygen partial pressure. A model is developed which considers non-interacting isolated vacancies, V′ and V″, and 4:1′″ clusters with Debye-Huckel interactions. All properties were accurately fit from 10^-6 ≤ P ≤ 35 atm at 1200°C using this non-unique model.

Original language	English (US)
Pages (from-to)	413-418
Number of pages	6
Journal	Journal of Physics and Chemistry of Solids
Volume	53
Issue number	3
DOIs	https://doi.org/10.1016/0022-3697(92)90176-E
State	Published - Mar 1992

Keywords

Co
Debye-Hückel theory
defect clustering
defect modelling

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/0022-3697(92)90176-E

Cite this

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title = "Non-stoichiometry, electrical properties, and cation diffusion in highly non-stoichiometric Co1-xO-II. Modelling the defect structure†",

abstract = "The defect structure of highly non-stoichometric Co1-xO is examined by fitting non-stoichiometry, electrical properties and cation diffusion data with various models. The ideal point defect model, the generalized cluster model and Debye-Huckel theory model for isolated vacancies are all shown to be inadequate in describing the properties dependence on oxygen partial pressure. A model is developed which considers non-interacting isolated vacancies, V′ and V″, and 4:1′″ clusters with Debye-Huckel interactions. All properties were accurately fit from 10-6 ≤ P ≤ 35 atm at 1200°C using this non-unique model.",

keywords = "Co, Debye-H{\"u}ckel theory, defect clustering, defect modelling",

author = "{Persels Constant}, K. and Mason, {T. O.} and Routbort, {J. L.}",

year = "1992",

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T1 - Non-stoichiometry, electrical properties, and cation diffusion in highly non-stoichiometric Co1-xO-II. Modelling the defect structure†

AU - Persels Constant, K.

AU - Mason, T. O.

AU - Routbort, J. L.

PY - 1992/3

Y1 - 1992/3

N2 - The defect structure of highly non-stoichometric Co1-xO is examined by fitting non-stoichiometry, electrical properties and cation diffusion data with various models. The ideal point defect model, the generalized cluster model and Debye-Huckel theory model for isolated vacancies are all shown to be inadequate in describing the properties dependence on oxygen partial pressure. A model is developed which considers non-interacting isolated vacancies, V′ and V″, and 4:1′″ clusters with Debye-Huckel interactions. All properties were accurately fit from 10-6 ≤ P ≤ 35 atm at 1200°C using this non-unique model.

AB - The defect structure of highly non-stoichometric Co1-xO is examined by fitting non-stoichiometry, electrical properties and cation diffusion data with various models. The ideal point defect model, the generalized cluster model and Debye-Huckel theory model for isolated vacancies are all shown to be inadequate in describing the properties dependence on oxygen partial pressure. A model is developed which considers non-interacting isolated vacancies, V′ and V″, and 4:1′″ clusters with Debye-Huckel interactions. All properties were accurately fit from 10-6 ≤ P ≤ 35 atm at 1200°C using this non-unique model.

KW - Co

KW - Debye-Hückel theory

KW - defect clustering

KW - defect modelling

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