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Florio, Daniel Zanetti De
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document
Electric Field-Assisted Pressureless Sintering of Ceramic Protonic Conductors
Abstract
Gadolinium, yttrium and samarium-doped barium cerate (BCGd, BCY andBCSm, respectively) polycrystalline green pellets weresubmitted to electric field-assisted pressurelesssintering experiments isothermally in the temperature range 800-1200<sup>o</sup>C under 100-200 V cm<sup>-1</sup>electric fields, limiting to 1-5 A the electric current pulseamplitude. The sintering experiments were carried out in ambientatmosphere with the pellets positioned inside avertical dilatometer furnace with Pt-Ir electrodes connected either to apowersupply for applying the electric field or to animpedance analyzer for collecting [-Z''(ω) x Z'(ω)] data to evaluate thebulkand the grain boundary contributions to theelectrical resistivity. Near full density was achieved in the sinteredsamples.The combined results of dilatometry and impedancespectroscopy measurements before and after flash sintering showsubstantialimprovement of the electrical conductivity of flashsintered specimens. Joule heating is assumed to be the primary effectof the electric current pulse through thespecimens. Improved grain-to-grain contact and the removal of depletedchemicalspecies due to Joule heating at the space chargeregion are proposed, respectively, as the reasons for the almost totaldisappearanceof the grain boundary component in the impedancediagrams and the improvement of the bulk electrical conductivity.