Fast mass interdiffusion in ceria/alumina composite

Francesca Teocoli; De Wei Ni; Simone Sanna; Karl Tor Sune Thydén; F. C. Fonseca; Vincenzo Esposito

doi:10.1039/c5ta02416a

Fast mass interdiffusion in ceria/alumina composite

Francesca Teocoli, De Wei Ni, Simone Sanna, Karl Tor Sune Thydén, F. C. Fonseca, Vincenzo Esposito

Department of Energy Conversion and Storage

Nuclear and Energy Research Institute

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Abstract

Gadolinium-doped ceria (CGO) presents unique processes at low oxygen partial pressure (pO2 < 1012 atm) and low temperatures (T > 800 C) such as faster mass diffusion, which are not observed in conventional sintering under ambient air conditions. In CGO/Al2O3 composites the resulting effects driven by such mass diffusion are low viscosity flows and high reactivity between phases, indicated by the formation of CeAlO3. This reaction is promoted by the high content of oxygen defects and the chemical reduction of Ce4+ cations to Ce3+ in CGO/Al2O3 composites under low temperature and low pO2. In this work, a comparison is made between sintering CGO/Al2O3 under ambient air conditions and under low pO2, focusing on densification, viscosity and the evolution of the microstructure.

Original language	English
Journal	Journal of Materials Chemistry A
Volume	3
Pages (from-to)	17135-17143
Number of pages	9
ISSN	2050-7488
DOIs	https://doi.org/10.1039/c5ta02416a
Publication status	Published - 2015

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title = "Fast mass interdiffusion in ceria/alumina composite",

abstract = "Gadolinium-doped ceria (CGO) presents unique processes at low oxygen partial pressure (pO2 < 1012 atm) and low temperatures (T > 800 C) such as faster mass diffusion, which are not observed in conventional sintering under ambient air conditions. In CGO/Al2O3 composites the resulting effects driven by such mass diffusion are low viscosity flows and high reactivity between phases, indicated by the formation of CeAlO3. This reaction is promoted by the high content of oxygen defects and the chemical reduction of Ce4+ cations to Ce3+ in CGO/Al2O3 composites under low temperature and low pO2. In this work, a comparison is made between sintering CGO/Al2O3 under ambient air conditions and under low pO2, focusing on densification, viscosity and the evolution of the microstructure.",

author = "Francesca Teocoli and Ni, {De Wei} and Simone Sanna and Thyd{\'e}n, {Karl Tor Sune} and Fonseca, {F. C.} and Vincenzo Esposito",

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doi = "10.1039/c5ta02416a",

language = "English",

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T1 - Fast mass interdiffusion in ceria/alumina composite

AU - Teocoli, Francesca

AU - Ni, De Wei

AU - Sanna, Simone

AU - Thydén, Karl Tor Sune

AU - Fonseca, F. C.

AU - Esposito, Vincenzo

PY - 2015

Y1 - 2015

N2 - Gadolinium-doped ceria (CGO) presents unique processes at low oxygen partial pressure (pO2 < 1012 atm) and low temperatures (T > 800 C) such as faster mass diffusion, which are not observed in conventional sintering under ambient air conditions. In CGO/Al2O3 composites the resulting effects driven by such mass diffusion are low viscosity flows and high reactivity between phases, indicated by the formation of CeAlO3. This reaction is promoted by the high content of oxygen defects and the chemical reduction of Ce4+ cations to Ce3+ in CGO/Al2O3 composites under low temperature and low pO2. In this work, a comparison is made between sintering CGO/Al2O3 under ambient air conditions and under low pO2, focusing on densification, viscosity and the evolution of the microstructure.

AB - Gadolinium-doped ceria (CGO) presents unique processes at low oxygen partial pressure (pO2 < 1012 atm) and low temperatures (T > 800 C) such as faster mass diffusion, which are not observed in conventional sintering under ambient air conditions. In CGO/Al2O3 composites the resulting effects driven by such mass diffusion are low viscosity flows and high reactivity between phases, indicated by the formation of CeAlO3. This reaction is promoted by the high content of oxygen defects and the chemical reduction of Ce4+ cations to Ce3+ in CGO/Al2O3 composites under low temperature and low pO2. In this work, a comparison is made between sintering CGO/Al2O3 under ambient air conditions and under low pO2, focusing on densification, viscosity and the evolution of the microstructure.

U2 - 10.1039/c5ta02416a

DO - 10.1039/c5ta02416a

M3 - Journal article

SN - 2050-7488

VL - 3

SP - 17135

EP - 17143

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

ER -

Fast mass interdiffusion in ceria/alumina composite

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