Phase related oxygen permeation through Sr-doped LaCoO3-δ

René H.E. van Doorn; Henny J.M. Bouwmeester; Anthonie J. Burggraaf

Phase related oxygen permeation through Sr-doped LaCoO_3-δ

René H.E. van Doorn, Henny J.M. Bouwmeester, Anthonie J. Burggraaf

Inorganic Materials Science

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Abstract

Oxygen permeation results through La_1-xSr_xCoO_3-δ are reported. It is shown that in the temperature region 750 - 775 °C an order-disorder of the oxygen sublattice occurs. The low temperature ordered phase is studied by X-Ray powder diffraction (XRD), neutron diffraction as well as selected area electron diffraction (SAED) together with High Resolution Transmission Electron Microscopy (HRTEM) coupled with Parallel Electron Energy Loss Spectroscopy (PEELS) and Energy Dispersive X-Ray spectroscopy (EDX). Although the long range methods XRD and neutron diffraction showed no indications for an oxygen vacancy ordering, SAED and HRTEM showed micro domains exhibiting an a_c x a_c x 2a_c superstructure, along with regions without indications for a superstructure. The superstructure could be interpreted in terms of an oxygen vacancy ordering due to which a large part of the oxygen vacancies were trapped in regions with the superstructure and so effectively reducing the ionic conductivity. By means of PEELS it was shown that the cobalt ions within the superstructure regions have a higher oxidation state than the cobalt ions in the non-ordered regions.

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	The Electrochemical Society Inc.
Pages	139-145
Number of pages	7
ISBN (Print)	9781566771191
Publication status	Published - 28 Jan 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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VanDoorn1997phaseFinal published version, 821 KB

1 Oral presentation

Phase related oxygen permeation through La_1-xSr_xCoO_3-γ
R.H.E. van Doorn (Keynote speaker), H.J.M. Bouwmeester (Keynote speaker) & A.J. Burggraaf (Keynote speaker)
9 Oct 1995
Activity: Talk or presentation › Oral presentation

Cite this

@inproceedings{f146709b798148f7932846284e079bf3,

title = "Phase related oxygen permeation through Sr-doped LaCoO3-δ",

abstract = "Oxygen permeation results through La1-xSrxCoO3-δ are reported. It is shown that in the temperature region 750 - 775 °C an order-disorder of the oxygen sublattice occurs. The low temperature ordered phase is studied by X-Ray powder diffraction (XRD), neutron diffraction as well as selected area electron diffraction (SAED) together with High Resolution Transmission Electron Microscopy (HRTEM) coupled with Parallel Electron Energy Loss Spectroscopy (PEELS) and Energy Dispersive X-Ray spectroscopy (EDX). Although the long range methods XRD and neutron diffraction showed no indications for an oxygen vacancy ordering, SAED and HRTEM showed micro domains exhibiting an ac x ac x 2ac superstructure, along with regions without indications for a superstructure. The superstructure could be interpreted in terms of an oxygen vacancy ordering due to which a large part of the oxygen vacancies were trapped in regions with the superstructure and so effectively reducing the ionic conductivity. By means of PEELS it was shown that the cobalt ions within the superstructure regions have a higher oxidation state than the cobalt ions in the non-ordered regions.",

author = "{van Doorn}, {Ren{\'e} H.E.} and Bouwmeester, {Henny J.M.} and Burggraaf, {Anthonie J.}",

year = "1997",

month = jan,

day = "28",

language = "English",

isbn = "9781566771191",

series = "Proceedings",

publisher = "The Electrochemical Society Inc.",

pages = "139--145",

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

booktitle = "Ceramic membranes I",

address = "United States",

note = "1st International Symposium on Ceramic Membranes 1995 ; Conference date: 08-10-1995 Through 13-10-1995",

}

van Doorn, RHE, Bouwmeester, HJM & Burggraaf, AJ 1997, Phase related oxygen permeation through Sr-doped LaCoO_3-δ. in HU Anderson, AC Khandkar & M Liu (eds), Ceramic membranes I: Proceedings of the First International Symposium on Ceramic Membranes. Proceedings, vol. 95-24, The Electrochemical Society Inc., Pennington, NJ, pp. 139-145, 1st International Symposium on Ceramic Membranes 1995, Chicago, Illinois, United States, 8/10/95.

Phase related oxygen permeation through Sr-doped LaCoO_3-δ. / van Doorn, René H.E.; Bouwmeester, Henny J.M.; Burggraaf, Anthonie J.

Ceramic membranes I: Proceedings of the First International Symposium on Ceramic Membranes. ed. / H.U. Anderson; A.C. Khandkar; M. Liu. Pennington, NJ : The Electrochemical Society Inc., 1997. p. 139-145 (Proceedings; Vol. 95-24).

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

TY - GEN

T1 - Phase related oxygen permeation through Sr-doped LaCoO3-δ

AU - van Doorn, René H.E.

AU - Bouwmeester, Henny J.M.

AU - Burggraaf, Anthonie J.

N1 - Conference code: 1

PY - 1997/1/28

Y1 - 1997/1/28

N2 - Oxygen permeation results through La1-xSrxCoO3-δ are reported. It is shown that in the temperature region 750 - 775 °C an order-disorder of the oxygen sublattice occurs. The low temperature ordered phase is studied by X-Ray powder diffraction (XRD), neutron diffraction as well as selected area electron diffraction (SAED) together with High Resolution Transmission Electron Microscopy (HRTEM) coupled with Parallel Electron Energy Loss Spectroscopy (PEELS) and Energy Dispersive X-Ray spectroscopy (EDX). Although the long range methods XRD and neutron diffraction showed no indications for an oxygen vacancy ordering, SAED and HRTEM showed micro domains exhibiting an ac x ac x 2ac superstructure, along with regions without indications for a superstructure. The superstructure could be interpreted in terms of an oxygen vacancy ordering due to which a large part of the oxygen vacancies were trapped in regions with the superstructure and so effectively reducing the ionic conductivity. By means of PEELS it was shown that the cobalt ions within the superstructure regions have a higher oxidation state than the cobalt ions in the non-ordered regions.

AB - Oxygen permeation results through La1-xSrxCoO3-δ are reported. It is shown that in the temperature region 750 - 775 °C an order-disorder of the oxygen sublattice occurs. The low temperature ordered phase is studied by X-Ray powder diffraction (XRD), neutron diffraction as well as selected area electron diffraction (SAED) together with High Resolution Transmission Electron Microscopy (HRTEM) coupled with Parallel Electron Energy Loss Spectroscopy (PEELS) and Energy Dispersive X-Ray spectroscopy (EDX). Although the long range methods XRD and neutron diffraction showed no indications for an oxygen vacancy ordering, SAED and HRTEM showed micro domains exhibiting an ac x ac x 2ac superstructure, along with regions without indications for a superstructure. The superstructure could be interpreted in terms of an oxygen vacancy ordering due to which a large part of the oxygen vacancies were trapped in regions with the superstructure and so effectively reducing the ionic conductivity. By means of PEELS it was shown that the cobalt ions within the superstructure regions have a higher oxidation state than the cobalt ions in the non-ordered regions.

M3 - Conference contribution

SN - 9781566771191

T3 - Proceedings

SP - 139

EP - 145

BT - Ceramic membranes I

A2 - Anderson, H.U.

A2 - Khandkar, A.C.

A2 - Liu, M.

PB - The Electrochemical Society Inc.

CY - Pennington, NJ

T2 - 1st International Symposium on Ceramic Membranes 1995

Y2 - 8 October 1995 through 13 October 1995

ER -

Phase related oxygen permeation through Sr-doped LaCoO3-δ

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Phase related oxygen permeation through La1-xSrxCoO3-γ

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Phase related oxygen permeation through Sr-doped LaCoO_3-δ

Phase related oxygen permeation through La_1-xSr_xCoO_3-γ