Electric Field-Assisted Pressureless Sintering of Ceramic Protonic Conductors

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Gadolinium, yttrium and samarium-doped barium cerate pressed pellets were submitted to flash sintering experiments isothermally in the temperature range 800-1300oC under 200 V cm-1 electric field. The pellets were positioned inside a dilatometer furnace with Pt-Ir electrodes connected either to a power supply or to an impedance analyzer 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 measurements in conventionally and flash sintered specimens show substantial improvement of the electrical conductivity. Joule heating is assumed to be the primary effect for sintering. 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 decrease of the grain boundary component in the impedance diagrams and the improvement of the bulk electrical conductivity.
Original languageEnglish
JournalE C S Transactions
Volume80
Issue number9
Pages (from-to)111-118
ISSN1938-5862
DOIs
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
CitationsWeb of Science® Times Cited: No match on DOI

ID: 138579749