Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr0.8Y0.2O3 - Δ

E. Kim; Y. Yamazaki; S. M. Haile; H. I. Yoo

doi:10.1016/j.ssi.2015.01.001

Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr_0.8Y_0.2O_{3 - Δ}

E. Kim, Y. Yamazaki, S. M. Haile, H. I. Yoo

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The influence of NiO, used as a sintering aid, on the transport properties of BaZr_0.8Y_0.2O_{3 - Δ} was investigated by monitoring electrical conductivity relaxation of specimens with and without NiO during hydration in atmospheres of different oxygen activities at 700 and 800 °C. The chemical diffusivities of H and O governing the kinetics were precisely evaluated from the transient conductivity, and all the defect-chemical parameters - the two external equilibrium constants and mobilities of all the carriers, V_O^{· ·}, H_i^· and h^· - were determined from the steady-state equilibrium conductivity. It is found that the processing benefits afforded by NiO are accompanied by a significant reduction in ionic mobilities and hydration reaction constant. These factors, in turn, result in a smaller electrolytic regime in the presence of NiO than when it is absent.

Original language	English
Pages (from-to)	23-28
Number of pages	6
Journal	Solid State Ionics
Volume	275
DOIs	https://doi.org/10.1016/j.ssi.2015.01.001
Publication status	Published - Jul 1 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr0.8Y0.2O3 - Δ",

abstract = "The influence of NiO, used as a sintering aid, on the transport properties of BaZr0.8Y0.2O3 - Δ was investigated by monitoring electrical conductivity relaxation of specimens with and without NiO during hydration in atmospheres of different oxygen activities at 700 and 800 °C. The chemical diffusivities of H and O governing the kinetics were precisely evaluated from the transient conductivity, and all the defect-chemical parameters - the two external equilibrium constants and mobilities of all the carriers, VO· ·, Hi· and h· - were determined from the steady-state equilibrium conductivity. It is found that the processing benefits afforded by NiO are accompanied by a significant reduction in ionic mobilities and hydration reaction constant. These factors, in turn, result in a smaller electrolytic regime in the presence of NiO than when it is absent.",

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AU - Kim, E.

AU - Yamazaki, Y.

AU - Haile, S. M.

AU - Yoo, H. I.

PY - 2015/7/1

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N2 - The influence of NiO, used as a sintering aid, on the transport properties of BaZr0.8Y0.2O3 - Δ was investigated by monitoring electrical conductivity relaxation of specimens with and without NiO during hydration in atmospheres of different oxygen activities at 700 and 800 °C. The chemical diffusivities of H and O governing the kinetics were precisely evaluated from the transient conductivity, and all the defect-chemical parameters - the two external equilibrium constants and mobilities of all the carriers, VO· ·, Hi· and h· - were determined from the steady-state equilibrium conductivity. It is found that the processing benefits afforded by NiO are accompanied by a significant reduction in ionic mobilities and hydration reaction constant. These factors, in turn, result in a smaller electrolytic regime in the presence of NiO than when it is absent.

AB - The influence of NiO, used as a sintering aid, on the transport properties of BaZr0.8Y0.2O3 - Δ was investigated by monitoring electrical conductivity relaxation of specimens with and without NiO during hydration in atmospheres of different oxygen activities at 700 and 800 °C. The chemical diffusivities of H and O governing the kinetics were precisely evaluated from the transient conductivity, and all the defect-chemical parameters - the two external equilibrium constants and mobilities of all the carriers, VO· ·, Hi· and h· - were determined from the steady-state equilibrium conductivity. It is found that the processing benefits afforded by NiO are accompanied by a significant reduction in ionic mobilities and hydration reaction constant. These factors, in turn, result in a smaller electrolytic regime in the presence of NiO than when it is absent.

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