Thermochemical stability and non-stoichiometry of erbia-stabilized bismuth oxide

H. Kruidhof; H.J.M. Bouwmeester; K.J. de Vries; P.J. Gellings; A.J. Burggraaf

doi:10.1016/0167-2738(92)90051-P

Thermochemical stability and non-stoichiometry of erbia-stabilized bismuth oxide

H. Kruidhof, H.J.M. Bouwmeester, K.J. de Vries, P.J. Gellings, A.J. Burggraaf

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Abstract

A phase study has been performed of high oxygen ion conducting erbia-stabilized bismutch oxide (1-x)Bi2O3·xEr2O3 (BE100X) using thermal analysis and X-ray powder diffraction. Investigation of the effect of a long-time (500 h) anneal of samples at 650°C in air revealed that the minimum amount of erbia needed to stabilize the high-temperature cubic ¿-Bi2O3 phase is 27.5 at%. This boundary value is much larger than the one usually reported in literature where the sluggishenss of the transformation from cubic to hexagonal at high Bi contents is not taken into account. Changes in nonstoichiometry of solid solutions Bi2-2xEr2xO3+¿ between 550°C and 850°C upon varying the ambient oxygen partial pressure are minimal for samples with 27.5 at% erbia, increasing with increasing erbia content. The parameter ¿ in pure oxygen increases from 0. 0044 for BE27.5 to 0.022 for BE50 taking the composition in nitrogen (PO2 ¿ 10¿4 atm) as stoichiometric reference (¿ = 0).

Original language	English
Pages (from-to)	181-186
Number of pages	6
Journal	Solid state ionics
Volume	50
Issue number	1-2
DOIs	https://doi.org/10.1016/0167-2738(92)90051-P
Publication status	Published - 1992

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@article{a4d3afa6e2e74c45be46b8dc0c9ce267,

title = "Thermochemical stability and non-stoichiometry of erbia-stabilized bismuth oxide",

abstract = "A phase study has been performed of high oxygen ion conducting erbia-stabilized bismutch oxide (1-x)Bi2O3·xEr2O3 (BE100X) using thermal analysis and X-ray powder diffraction. Investigation of the effect of a long-time (500 h) anneal of samples at 650°C in air revealed that the minimum amount of erbia needed to stabilize the high-temperature cubic ¿-Bi2O3 phase is 27.5 at%. This boundary value is much larger than the one usually reported in literature where the sluggishenss of the transformation from cubic to hexagonal at high Bi contents is not taken into account. Changes in nonstoichiometry of solid solutions Bi2-2xEr2xO3+¿ between 550°C and 850°C upon varying the ambient oxygen partial pressure are minimal for samples with 27.5 at% erbia, increasing with increasing erbia content. The parameter ¿ in pure oxygen increases from 0. 0044 for BE27.5 to 0.022 for BE50 taking the composition in nitrogen (PO2 ¿ 10¿4 atm) as stoichiometric reference (¿ = 0).",

author = "H. Kruidhof and H.J.M. Bouwmeester and {de Vries}, K.J. and P.J. Gellings and A.J. Burggraaf",

year = "1992",

doi = "10.1016/0167-2738(92)90051-P",

language = "English",

volume = "50",

pages = "181--186",

journal = "Solid state ionics",

issn = "0167-2738",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - Thermochemical stability and non-stoichiometry of erbia-stabilized bismuth oxide

AU - Kruidhof, H.

AU - Bouwmeester, H.J.M.

AU - de Vries, K.J.

AU - Gellings, P.J.

AU - Burggraaf, A.J.

PY - 1992

Y1 - 1992

N2 - A phase study has been performed of high oxygen ion conducting erbia-stabilized bismutch oxide (1-x)Bi2O3·xEr2O3 (BE100X) using thermal analysis and X-ray powder diffraction. Investigation of the effect of a long-time (500 h) anneal of samples at 650°C in air revealed that the minimum amount of erbia needed to stabilize the high-temperature cubic ¿-Bi2O3 phase is 27.5 at%. This boundary value is much larger than the one usually reported in literature where the sluggishenss of the transformation from cubic to hexagonal at high Bi contents is not taken into account. Changes in nonstoichiometry of solid solutions Bi2-2xEr2xO3+¿ between 550°C and 850°C upon varying the ambient oxygen partial pressure are minimal for samples with 27.5 at% erbia, increasing with increasing erbia content. The parameter ¿ in pure oxygen increases from 0. 0044 for BE27.5 to 0.022 for BE50 taking the composition in nitrogen (PO2 ¿ 10¿4 atm) as stoichiometric reference (¿ = 0).

AB - A phase study has been performed of high oxygen ion conducting erbia-stabilized bismutch oxide (1-x)Bi2O3·xEr2O3 (BE100X) using thermal analysis and X-ray powder diffraction. Investigation of the effect of a long-time (500 h) anneal of samples at 650°C in air revealed that the minimum amount of erbia needed to stabilize the high-temperature cubic ¿-Bi2O3 phase is 27.5 at%. This boundary value is much larger than the one usually reported in literature where the sluggishenss of the transformation from cubic to hexagonal at high Bi contents is not taken into account. Changes in nonstoichiometry of solid solutions Bi2-2xEr2xO3+¿ between 550°C and 850°C upon varying the ambient oxygen partial pressure are minimal for samples with 27.5 at% erbia, increasing with increasing erbia content. The parameter ¿ in pure oxygen increases from 0. 0044 for BE27.5 to 0.022 for BE50 taking the composition in nitrogen (PO2 ¿ 10¿4 atm) as stoichiometric reference (¿ = 0).

U2 - 10.1016/0167-2738(92)90051-P

DO - 10.1016/0167-2738(92)90051-P

M3 - Article

SN - 0167-2738

VL - 50

SP - 181

EP - 186

JO - Solid state ionics

JF - Solid state ionics

IS - 1-2

ER -

Thermochemical stability and non-stoichiometry of erbia-stabilized bismuth oxide

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