Journal
MATERIALS RESEARCH EXPRESS
Volume 6, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab4f97
Keywords
flash sintering; NiO-GDC composite; one-step synthesis; microstructure; electrical conductivity
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Funding
- CONICYT, Government of Chile, Santiago [21150095]
- Fondef [14i20452]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brazil (CAPES) [001]
- CNPq (Brazil) [311883/2016-8, 431428/2018-2]
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For the first time, the flash sintering process was successfully applied on NiO-Ce0.9Gd0.1O1.95 (NiO-GDC) composite, satisfactorily obtained from a 'one-step' synthesis method, in the temperature range from 105 degrees C to 216 degrees C using an electrical field range from 130 to 40 V cm(-1). The use of a high electric field and high current densities increases the instability of the process, producing a high concentration of current in the material and presenting typical solidification microstructures, which is a sign of the high concentration of power under these conditions. The decrease of the electric field to 50 V cm(-1) allows highly densified samples to be obtained at temperatures as low as 200 degrees C using a current density of 260 mA mm(-2). The electrical conductivity of densified samples prepared at different current densities shows a high conductivity in the temperature range of 400-650 degrees C, in which it reaches up to 0.23 (omega cm)(-1) at 650 degrees C.
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