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On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide
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| Zeitschriftentitel: | High Temperature Materials and Processes |
|---|---|
| Personen und Körperschaften: | , , |
| In: | High Temperature Materials and Processes, 31, 2012, 4-5, S. 371-379 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
| veröffentlicht: |
Walter de Gruyter GmbH
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| Schlagwörter: |
| author_facet |
Kaczmarska, A. Grzesik, Z. Mrowec, S. Kaczmarska, A. Grzesik, Z. Mrowec, S. |
|---|---|
| author |
Kaczmarska, A. Grzesik, Z. Mrowec, S. |
| spellingShingle |
Kaczmarska, A. Grzesik, Z. Mrowec, S. High Temperature Materials and Processes On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide Physical and Theoretical Chemistry Mechanics of Materials Condensed Matter Physics General Materials Science |
| author_sort |
kaczmarska, a. |
| spelling |
Kaczmarska, A. Grzesik, Z. Mrowec, S. 2191-0324 0334-6455 Walter de Gruyter GmbH Physical and Theoretical Chemistry Mechanics of Materials Condensed Matter Physics General Materials Science http://dx.doi.org/10.1515/htmp-2012-0069 <jats:title>Abstract</jats:title><jats:p>Defect structure and transport properties of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> cobalt oxide have been studied as a function of temperature and oxygen pressure, using marker and thermogravimetric techniques. It has been found that the oxidation of CoO to form Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> follows parabolic kinetic, being thus diffusion controlled. Marker experiments have demonstrated that cation sublattice of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> oxide is predominantly disordered, but the defect structure is rather complex. At very low oxygen pressures, close to the dissociation pressure of the oxide, interstitial cations are the predominant point defects, while at high pressures cation vacancies predominate. This behavior is reflected in complex dependence of the parabolic rate constant of CoO oxidation on oxygen pressure. At low pressures, namely, parabolic rate constant of the reaction increases with oxygen pressure, reaching then virtually constant value in intermediate pressure range and increases again in highest pressure range. Theoretical analysis of kinetic results in terms of point defect thermodynamics confirmed the above conclusion, concerning complex defect structure of Co<jats:sub>3±y</jats:sub>O<jats:sub>4</jats:sub> oxide. Finally, self-diffusion coefficient of cations in the discussed oxide has been calculated as a function of temperature and oxygen pressure from kinetic rate measurements, using Wagner's theory of metals oxidation.</jats:p> On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide High Temperature Materials and Processes |
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High Temperature Materials and Processes |
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| title |
On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_unstemmed |
On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_full |
On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_fullStr |
On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_full_unstemmed |
On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_short |
On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_sort |
on the defect structure and transport properties of co3o4 spinel oxide |
| topic |
Physical and Theoretical Chemistry Mechanics of Materials Condensed Matter Physics General Materials Science |
| url |
http://dx.doi.org/10.1515/htmp-2012-0069 |
| publishDate |
2012 |
| physical |
371-379 |
| description |
<jats:title>Abstract</jats:title><jats:p>Defect structure and transport properties of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> cobalt oxide have been studied as a function of temperature and oxygen pressure, using marker and thermogravimetric techniques. It has been found that the oxidation of CoO to form Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> follows parabolic kinetic, being thus diffusion controlled. Marker experiments have demonstrated that cation sublattice of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> oxide is predominantly disordered, but the defect structure is rather complex. At very low oxygen pressures, close to the dissociation pressure of the oxide, interstitial cations are the predominant point defects, while at high pressures cation vacancies predominate. This behavior is reflected in complex dependence of the parabolic rate constant of CoO oxidation on oxygen pressure. At low pressures, namely, parabolic rate constant of the reaction increases with oxygen pressure, reaching then virtually constant value in intermediate pressure range and increases again in highest pressure range. Theoretical analysis of kinetic results in terms of point defect thermodynamics confirmed the above conclusion, concerning complex defect structure of Co<jats:sub>3±y</jats:sub>O<jats:sub>4</jats:sub> oxide. Finally, self-diffusion coefficient of cations in the discussed oxide has been calculated as a function of temperature and oxygen pressure from kinetic rate measurements, using Wagner's theory of metals oxidation.</jats:p> |
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| author | Kaczmarska, A., Grzesik, Z., Mrowec, S. |
| author_facet | Kaczmarska, A., Grzesik, Z., Mrowec, S., Kaczmarska, A., Grzesik, Z., Mrowec, S. |
| author_sort | kaczmarska, a. |
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| description | <jats:title>Abstract</jats:title><jats:p>Defect structure and transport properties of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> cobalt oxide have been studied as a function of temperature and oxygen pressure, using marker and thermogravimetric techniques. It has been found that the oxidation of CoO to form Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> follows parabolic kinetic, being thus diffusion controlled. Marker experiments have demonstrated that cation sublattice of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> oxide is predominantly disordered, but the defect structure is rather complex. At very low oxygen pressures, close to the dissociation pressure of the oxide, interstitial cations are the predominant point defects, while at high pressures cation vacancies predominate. This behavior is reflected in complex dependence of the parabolic rate constant of CoO oxidation on oxygen pressure. At low pressures, namely, parabolic rate constant of the reaction increases with oxygen pressure, reaching then virtually constant value in intermediate pressure range and increases again in highest pressure range. Theoretical analysis of kinetic results in terms of point defect thermodynamics confirmed the above conclusion, concerning complex defect structure of Co<jats:sub>3±y</jats:sub>O<jats:sub>4</jats:sub> oxide. Finally, self-diffusion coefficient of cations in the discussed oxide has been calculated as a function of temperature and oxygen pressure from kinetic rate measurements, using Wagner's theory of metals oxidation.</jats:p> |
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| institution | DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Zi4, DE-Gla1, DE-15, DE-Pl11, DE-Rs1, DE-14, DE-105, DE-Ch1, DE-L229 |
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| spelling | Kaczmarska, A. Grzesik, Z. Mrowec, S. 2191-0324 0334-6455 Walter de Gruyter GmbH Physical and Theoretical Chemistry Mechanics of Materials Condensed Matter Physics General Materials Science http://dx.doi.org/10.1515/htmp-2012-0069 <jats:title>Abstract</jats:title><jats:p>Defect structure and transport properties of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> cobalt oxide have been studied as a function of temperature and oxygen pressure, using marker and thermogravimetric techniques. It has been found that the oxidation of CoO to form Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> follows parabolic kinetic, being thus diffusion controlled. Marker experiments have demonstrated that cation sublattice of Co<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> oxide is predominantly disordered, but the defect structure is rather complex. At very low oxygen pressures, close to the dissociation pressure of the oxide, interstitial cations are the predominant point defects, while at high pressures cation vacancies predominate. This behavior is reflected in complex dependence of the parabolic rate constant of CoO oxidation on oxygen pressure. At low pressures, namely, parabolic rate constant of the reaction increases with oxygen pressure, reaching then virtually constant value in intermediate pressure range and increases again in highest pressure range. Theoretical analysis of kinetic results in terms of point defect thermodynamics confirmed the above conclusion, concerning complex defect structure of Co<jats:sub>3±y</jats:sub>O<jats:sub>4</jats:sub> oxide. Finally, self-diffusion coefficient of cations in the discussed oxide has been calculated as a function of temperature and oxygen pressure from kinetic rate measurements, using Wagner's theory of metals oxidation.</jats:p> On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide High Temperature Materials and Processes |
| spellingShingle | Kaczmarska, A., Grzesik, Z., Mrowec, S., High Temperature Materials and Processes, On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide, Physical and Theoretical Chemistry, Mechanics of Materials, Condensed Matter Physics, General Materials Science |
| title | On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_full | On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_fullStr | On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_full_unstemmed | On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_short | On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| title_sort | on the defect structure and transport properties of co3o4 spinel oxide |
| title_unstemmed | On the Defect Structure and Transport Properties of Co3O4 Spinel Oxide |
| topic | Physical and Theoretical Chemistry, Mechanics of Materials, Condensed Matter Physics, General Materials Science |
| url | http://dx.doi.org/10.1515/htmp-2012-0069 |