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ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION

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ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION. / LACERDA, M; WEST, AR; IRVINE, JTS; Irvine, John Thomas Sirr.

In: Solid State Ionics, Vol. 59, No. 3-4, 02.1993, p. 257-262.

Research output: Contribution to journalArticle

Harvard

LACERDA, M, WEST, AR, IRVINE, JTS & Irvine, JTS 1993, 'ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION', Solid State Ionics, vol. 59, no. 3-4, pp. 257-262.

APA

LACERDA, M., WEST, AR., IRVINE, JTS., & Irvine, J. T. S. (1993). ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION. Solid State Ionics, 59(3-4), 257-262.

Vancouver

LACERDA M, WEST AR, IRVINE JTS, Irvine JTS. ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION. Solid State Ionics. 1993 Feb;59(3-4):257-262.

Author

LACERDA, M ; WEST, AR ; IRVINE, JTS ; Irvine, John Thomas Sirr. / ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION. In: Solid State Ionics. 1993 ; Vol. 59, No. 3-4. pp. 257-262.

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@article{0fd3a5d983894436bf5a2f1eaf9ded91,
title = "ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION",
abstract = "Complex changes in the electrical properties of the oxide ion-conducting solid electrolyte Ca12Al14O33 were observed on heating in reducing atmospheres. On gentle reduction the high oxide ion conductivity of Ca12Al14O33 Was gradually destroyed, due to the formation and growth of resistive grain boundary and surface components. An interesting effect is the thickening of the grain boundary layer on reduction as indicated by capacitance data; the grain boundary appears to form a shell around the residual, oxide ion conducting core of the individual grains. Similar impedance responses were observed in samples annealed below 700-degrees-C and in samples slow cooled from higher temperatures. Under more severe reduction, at temperatures above 800-degrees-C, the surface layer was no longer observed and the conductivity of both the shell and core increased and appeared to become electronic. This behaviour could be retained to lower temperatures by quenching. These observations are consistent with two reduction processes: the mobile oxide ions are effectively trapped as immobile hydroxides at lower temperatures, whereas more extensive reduction at high temperatures yields conductive electronic behaviour.",
keywords = "OXIDE ION CONDUCTIVITY",
author = "M LACERDA and AR WEST and JTS IRVINE and Irvine, {John Thomas Sirr}",
year = "1993",
month = "2",
language = "English",
volume = "59",
pages = "257--262",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",
number = "3-4",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - ELECTRICAL-PROPERTIES OF CA12AL14O33 - EFFECT OF HYDROGEN REDUCTION

AU - LACERDA, M

AU - WEST, AR

AU - IRVINE, JTS

AU - Irvine, John Thomas Sirr

PY - 1993/2

Y1 - 1993/2

N2 - Complex changes in the electrical properties of the oxide ion-conducting solid electrolyte Ca12Al14O33 were observed on heating in reducing atmospheres. On gentle reduction the high oxide ion conductivity of Ca12Al14O33 Was gradually destroyed, due to the formation and growth of resistive grain boundary and surface components. An interesting effect is the thickening of the grain boundary layer on reduction as indicated by capacitance data; the grain boundary appears to form a shell around the residual, oxide ion conducting core of the individual grains. Similar impedance responses were observed in samples annealed below 700-degrees-C and in samples slow cooled from higher temperatures. Under more severe reduction, at temperatures above 800-degrees-C, the surface layer was no longer observed and the conductivity of both the shell and core increased and appeared to become electronic. This behaviour could be retained to lower temperatures by quenching. These observations are consistent with two reduction processes: the mobile oxide ions are effectively trapped as immobile hydroxides at lower temperatures, whereas more extensive reduction at high temperatures yields conductive electronic behaviour.

AB - Complex changes in the electrical properties of the oxide ion-conducting solid electrolyte Ca12Al14O33 were observed on heating in reducing atmospheres. On gentle reduction the high oxide ion conductivity of Ca12Al14O33 Was gradually destroyed, due to the formation and growth of resistive grain boundary and surface components. An interesting effect is the thickening of the grain boundary layer on reduction as indicated by capacitance data; the grain boundary appears to form a shell around the residual, oxide ion conducting core of the individual grains. Similar impedance responses were observed in samples annealed below 700-degrees-C and in samples slow cooled from higher temperatures. Under more severe reduction, at temperatures above 800-degrees-C, the surface layer was no longer observed and the conductivity of both the shell and core increased and appeared to become electronic. This behaviour could be retained to lower temperatures by quenching. These observations are consistent with two reduction processes: the mobile oxide ions are effectively trapped as immobile hydroxides at lower temperatures, whereas more extensive reduction at high temperatures yields conductive electronic behaviour.

KW - OXIDE ION CONDUCTIVITY

M3 - Article

VL - 59

SP - 257

EP - 262

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

IS - 3-4

ER -

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