Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites

Martijn H.R. Lankhorst; H.J.M. Bouwmeester; B.A. Boukamp; H. Verweij

Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites

Martijn H.R. Lankhorst, H.J.M. Bouwmeester, B.A. Boukamp, H. Verweij

Inorganic Materials Science

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

An oxygen coulometric titration cell has been designed to measure non-stoichiometry and oxygen diffusivity of mixed oxygen ion and electronic conducting, La_0.8Sr_0.2CoO_3-δ. Chemical diffusion data, combined with oxygen non-stoichiometry data, δ, show that the oxygen vacancy diffusion coefficient is 5.25*e ^{-(132±7 KJ/mol)RT}cm²/_s, and independent of the oxygen partial pressure, P₀₁. In addition, it is found that log(δ) is linearly related to log(P₀₁) with slope of -0.23±0.02. The entropy associated with oxygen incorporation can be modelled with the configurational entropy of the oxygen vacancies. No electronic entropy contribution is observed. The energy of oxygen incorporation decreases almost linearly with increasing oxygen stoichiometry. Both energy and entropy data agree with a model in which electrons gradually fill electron states in a broad electron band. From the data an empirical relation between vacancy-concentration, temperature and oxygen partial pressure can be formulated, which deviates from mass action behavior.

Original language	English
Title of host publication	Ceramic Membranes I
Subtitle of host publication	Proceedings of the First International Symposium on Ceramic Membranes
Editors	H.U. Anderson, A.C. Khandkar, M. Liu
Place of Publication	Pennington, NJ
Publisher	Electrochemical Society
Pages	83-93
ISBN (Print)	9781566771191
Publication status	Published - 1997
Event	1st International Symposium on Ceramic Membranes 1995 - Chicago, United States Duration: 8 Oct 1995 → 13 Oct 1995 Conference number: 1

Publication series

Name	Proceedings
Publisher	The Electrochemical Society, Inc.
Volume	95-24
ISSN (Print)	0161-6374

Conference

Conference	1st International Symposium on Ceramic Membranes 1995
Country/Territory	United States
City	Chicago
Period	8/10/95 → 13/10/95

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Lankhorst, M. H. R., Bouwmeester, H. J. M., Boukamp, B. A., & Verweij, H. (1997). Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites. In H. U. Anderson, A. C. Khandkar, & M. Liu (Eds.), Ceramic Membranes I: Proceedings of the First International Symposium on Ceramic Membranes (pp. 83-93). (Proceedings; Vol. 95-24). Electrochemical Society.

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title = "Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites",

abstract = "An oxygen coulometric titration cell has been designed to measure non-stoichiometry and oxygen diffusivity of mixed oxygen ion and electronic conducting, La0.8Sr0.2CoO3-δ. Chemical diffusion data, combined with oxygen non-stoichiometry data, δ, show that the oxygen vacancy diffusion coefficient is 5.25*e -(132±7 KJ/mol)RTcm2/s, and independent of the oxygen partial pressure, P01. In addition, it is found that log(δ) is linearly related to log(P01) with slope of -0.23±0.02. The entropy associated with oxygen incorporation can be modelled with the configurational entropy of the oxygen vacancies. No electronic entropy contribution is observed. The energy of oxygen incorporation decreases almost linearly with increasing oxygen stoichiometry. Both energy and entropy data agree with a model in which electrons gradually fill electron states in a broad electron band. From the data an empirical relation between vacancy-concentration, temperature and oxygen partial pressure can be formulated, which deviates from mass action behavior.",

author = "Lankhorst, {Martijn H.R.} and H.J.M. Bouwmeester and B.A. Boukamp and H. Verweij",

note = "First International Symposium on Ceramic membranes was held during the 188th Meeting of the Electrochemical Society, October 8-13, 1995.; 1st International Symposium on Ceramic Membranes 1995 ; Conference date: 08-10-1995 Through 13-10-1995",

year = "1997",

language = "English",

isbn = "9781566771191",

series = "Proceedings",

publisher = "Electrochemical Society",

pages = "83--93",

editor = "H.U. Anderson and A.C. Khandkar and M. Liu",

booktitle = "Ceramic Membranes I",

address = "United States",

}

Lankhorst, MHR, Bouwmeester, HJM , Boukamp, BA & Verweij, H 1997, Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites. in HU Anderson, AC Khandkar & M Liu (eds), Ceramic Membranes I: Proceedings of the First International Symposium on Ceramic Membranes. Proceedings, vol. 95-24, Electrochemical Society, Pennington, NJ, pp. 83-93, 1st International Symposium on Ceramic Membranes 1995, Chicago, Illinois, United States, 8/10/95.

Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites. / Lankhorst, Martijn H.R.; Bouwmeester, H.J.M.; Boukamp, B.A. et al.
Ceramic Membranes I: Proceedings of the First International Symposium on Ceramic Membranes. ed. / H.U. Anderson; A.C. Khandkar; M. Liu. Pennington, NJ: Electrochemical Society, 1997. p. 83-93 (Proceedings; Vol. 95-24).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites

AU - Lankhorst, Martijn H.R.

AU - Bouwmeester, H.J.M.

AU - Boukamp, B.A.

AU - Verweij, H.

N1 - Conference code: 1

PY - 1997

Y1 - 1997

N2 - An oxygen coulometric titration cell has been designed to measure non-stoichiometry and oxygen diffusivity of mixed oxygen ion and electronic conducting, La0.8Sr0.2CoO3-δ. Chemical diffusion data, combined with oxygen non-stoichiometry data, δ, show that the oxygen vacancy diffusion coefficient is 5.25*e -(132±7 KJ/mol)RTcm2/s, and independent of the oxygen partial pressure, P01. In addition, it is found that log(δ) is linearly related to log(P01) with slope of -0.23±0.02. The entropy associated with oxygen incorporation can be modelled with the configurational entropy of the oxygen vacancies. No electronic entropy contribution is observed. The energy of oxygen incorporation decreases almost linearly with increasing oxygen stoichiometry. Both energy and entropy data agree with a model in which electrons gradually fill electron states in a broad electron band. From the data an empirical relation between vacancy-concentration, temperature and oxygen partial pressure can be formulated, which deviates from mass action behavior.

AB - An oxygen coulometric titration cell has been designed to measure non-stoichiometry and oxygen diffusivity of mixed oxygen ion and electronic conducting, La0.8Sr0.2CoO3-δ. Chemical diffusion data, combined with oxygen non-stoichiometry data, δ, show that the oxygen vacancy diffusion coefficient is 5.25*e -(132±7 KJ/mol)RTcm2/s, and independent of the oxygen partial pressure, P01. In addition, it is found that log(δ) is linearly related to log(P01) with slope of -0.23±0.02. The entropy associated with oxygen incorporation can be modelled with the configurational entropy of the oxygen vacancies. No electronic entropy contribution is observed. The energy of oxygen incorporation decreases almost linearly with increasing oxygen stoichiometry. Both energy and entropy data agree with a model in which electrons gradually fill electron states in a broad electron band. From the data an empirical relation between vacancy-concentration, temperature and oxygen partial pressure can be formulated, which deviates from mass action behavior.

M3 - Conference contribution

SN - 9781566771191

T3 - Proceedings

SP - 83

EP - 93

BT - Ceramic Membranes I

A2 - Anderson, H.U.

A2 - Khandkar, A.C.

A2 - Liu, M.

PB - Electrochemical Society

CY - Pennington, NJ

T2 - 1st International Symposium on Ceramic Membranes 1995

Y2 - 8 October 1995 through 13 October 1995

ER -

Oxygen non-stoichiometry and oxygen diffusivity of mixed conducting perovskites

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