Electric Field-Assisted Pressureless Sintering of Ceramic Protonic Conductors

R. Muccillo, Vincenzo Esposito, Daniel Zanetti De Florio, E.N.S. Muccillo

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Abstract

Gadolinium, yttrium and samarium-doped barium cerate (BCGd, BCY and BCSm, respectively) polycrystalline green pellets were submitted to electric field-assisted pressureless sintering experiments isothermally in the temperature range 800-1200oC under 100-200 V cm-1 electric fields, limiting to 1-5 A the electric current pulse amplitude. The sintering experiments were carried out in ambient atmosphere with the pellets positioned inside a vertical dilatometer furnace with Pt-Ir electrodes connected either to a power supply for applying the electric field or to an impedance analyzer for collecting [-Z''(ω) x Z'(ω)] data to evaluate the bulk and the grain boundary contributions to the electrical resistivity. Near full density was achieved in the sintered samples. The combined results of dilatometry and impedance spectroscopy measurements before and after flash sintering show substantial improvement of the electrical conductivity of flash sintered specimens. Joule heating is assumed to be the primary effect of the electric current pulse through the specimens. Improved grain-to-grain contact and the removal of depleted chemical species due to Joule heating at the space charge region are proposed, respectively, as the reasons for the almost total disappearance of the grain boundary component in the impedance diagrams and the improvement of the bulk electrical conductivity.
Original languageEnglish
Article number1727
JournalElectrochemical Society. Meeting Abstracts (Online)
Volume MA2017-02
Number of pages1
ISSN2151-2043
Publication statusPublished - 2017
Event232nd ECS meeting - National Harbor, Washington, DC, United States
Duration: 1 Oct 20175 Oct 2017
http://www.electrochem.org/232

Conference

Conference232nd ECS meeting
CountryUnited States
CityNational Harbor, Washington, DC
Period01/10/201705/10/2017
Internet address

Cite this

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title = "Electric Field-Assisted Pressureless Sintering of Ceramic Protonic Conductors",
abstract = "Gadolinium, yttrium and samarium-doped barium cerate (BCGd, BCY and BCSm, respectively) polycrystalline green pellets were submitted to electric field-assisted pressureless sintering experiments isothermally in the temperature range 800-1200oC under 100-200 V cm-1 electric fields, limiting to 1-5 A the electric current pulse amplitude. The sintering experiments were carried out in ambient atmosphere with the pellets positioned inside a vertical dilatometer furnace with Pt-Ir electrodes connected either to a power supply for applying the electric field or to an impedance analyzer for collecting [-Z''(ω) x Z'(ω)] data to evaluate the bulk and the grain boundary contributions to the electrical resistivity. Near full density was achieved in the sintered samples. The combined results of dilatometry and impedance spectroscopy measurements before and after flash sintering show substantial improvement of the electrical conductivity of flash sintered specimens. Joule heating is assumed to be the primary effect of the electric current pulse through the specimens. Improved grain-to-grain contact and the removal of depleted chemical species due to Joule heating at the space charge region are proposed, respectively, as the reasons for the almost total disappearance of the grain boundary component in the impedance diagrams and the improvement of the bulk electrical conductivity.",
author = "R. Muccillo and Vincenzo Esposito and {Zanetti De Florio}, Daniel and E.N.S. Muccillo",
year = "2017",
language = "English",
volume = "MA2017-02",
journal = "Electrochemical Society. Meeting Abstracts (Online)",
issn = "2151-2043",

}

Electric Field-Assisted Pressureless Sintering of Ceramic Protonic Conductors. / Muccillo, R.; Esposito, Vincenzo; Zanetti De Florio, Daniel; Muccillo, E.N.S.

In: Electrochemical Society. Meeting Abstracts (Online), Vol. MA2017-02 , 1727, 2017.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

TY - ABST

T1 - Electric Field-Assisted Pressureless Sintering of Ceramic Protonic Conductors

AU - Muccillo, R.

AU - Esposito, Vincenzo

AU - Zanetti De Florio, Daniel

AU - Muccillo, E.N.S.

PY - 2017

Y1 - 2017

N2 - Gadolinium, yttrium and samarium-doped barium cerate (BCGd, BCY and BCSm, respectively) polycrystalline green pellets were submitted to electric field-assisted pressureless sintering experiments isothermally in the temperature range 800-1200oC under 100-200 V cm-1 electric fields, limiting to 1-5 A the electric current pulse amplitude. The sintering experiments were carried out in ambient atmosphere with the pellets positioned inside a vertical dilatometer furnace with Pt-Ir electrodes connected either to a power supply for applying the electric field or to an impedance analyzer for collecting [-Z''(ω) x Z'(ω)] data to evaluate the bulk and the grain boundary contributions to the electrical resistivity. Near full density was achieved in the sintered samples. The combined results of dilatometry and impedance spectroscopy measurements before and after flash sintering show substantial improvement of the electrical conductivity of flash sintered specimens. Joule heating is assumed to be the primary effect of the electric current pulse through the specimens. Improved grain-to-grain contact and the removal of depleted chemical species due to Joule heating at the space charge region are proposed, respectively, as the reasons for the almost total disappearance of the grain boundary component in the impedance diagrams and the improvement of the bulk electrical conductivity.

AB - Gadolinium, yttrium and samarium-doped barium cerate (BCGd, BCY and BCSm, respectively) polycrystalline green pellets were submitted to electric field-assisted pressureless sintering experiments isothermally in the temperature range 800-1200oC under 100-200 V cm-1 electric fields, limiting to 1-5 A the electric current pulse amplitude. The sintering experiments were carried out in ambient atmosphere with the pellets positioned inside a vertical dilatometer furnace with Pt-Ir electrodes connected either to a power supply for applying the electric field or to an impedance analyzer for collecting [-Z''(ω) x Z'(ω)] data to evaluate the bulk and the grain boundary contributions to the electrical resistivity. Near full density was achieved in the sintered samples. The combined results of dilatometry and impedance spectroscopy measurements before and after flash sintering show substantial improvement of the electrical conductivity of flash sintered specimens. Joule heating is assumed to be the primary effect of the electric current pulse through the specimens. Improved grain-to-grain contact and the removal of depleted chemical species due to Joule heating at the space charge region are proposed, respectively, as the reasons for the almost total disappearance of the grain boundary component in the impedance diagrams and the improvement of the bulk electrical conductivity.

M3 - Conference abstract in journal

VL - MA2017-02

JO - Electrochemical Society. Meeting Abstracts (Online)

JF - Electrochemical Society. Meeting Abstracts (Online)

SN - 2151-2043

M1 - 1727

ER -