Phase assembly and electrical conductivity of spark plasma sintered CeO2–ZrO2 ceramics

Description

Ce x Zr1−x O2 (x = 0.10, 0.16 and 0.33) nanocrystalline powders were obtained by a two-step synthesis technique and sintered by spark plasma sintering (SPS). As consequence of the reduction of Ce4+ to Ce3+ species by carbon in the graphite environment in SPS, phase assemblies including tetragonal, monoclinic and pyrochlore phases were generated in the ceramics during the sintering process. The electrical conductivity was highly dependent on phase assembly and atmosphere (N2, H2 and O2). A significant decrease in the activation energy was noticed in the ceramics with high pyrochlore content when measuring the conductivity in H2 atmosphere, consequence of the strong reduction promoted in these ceramics during the measurement. Equal conduction behavior with similar activation energy was observed in all the ceramics when measuring in O2 atmosphere

Abstract

Junta de Andalucía TEP-1048

Abstract

España Ministerio de Ciencia e Innovación ENE2009-14522-C05-01 ENE2009-14522-C05-03

Abstract

Unión Europea Junta de Andalucía P09-TEP-5454

Additional details