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

Research output: Contribution to journalArticle

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)23-28
Number of pages6
JournalSolid State Ionics
Volume275
DOIs
Publication statusPublished - Jul 1 2015
Externally publishedYes

Fingerprint

Hydration
hydration
sintering
Sintering
ionic mobility
conductivity
Defects
Kinetics
defects
Equilibrium constants
kinetics
Transport properties
diffusivity
Rate constants
Thermodynamic properties
transport properties
Oxygen
atmospheres
electrical resistivity
Monitoring

All Science Journal Classification (ASJC) codes

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

Cite this

Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr0.8Y0.2O3 - Δ. / Kim, E.; Yamazaki, Y.; Haile, S. M.; Yoo, H. I.

In: Solid State Ionics, Vol. 275, 01.07.2015, p. 23-28.

Research output: Contribution to journalArticle

@article{051c4249f1d64b35a931d16cfeee38b7,
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.",
author = "E. Kim and Y. Yamazaki and Haile, {S. M.} and Yoo, {H. I.}",
year = "2015",
month = "7",
day = "1",
doi = "10.1016/j.ssi.2015.01.001",
language = "English",
volume = "275",
pages = "23--28",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",

}

TY - JOUR

T1 - Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr0.8Y0.2O3 - Δ

AU - Kim, E.

AU - Yamazaki, Y.

AU - Haile, S. M.

AU - Yoo, H. I.

PY - 2015/7/1

Y1 - 2015/7/1

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.

UR - http://www.scopus.com/inward/record.url?scp=84939973941&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84939973941&partnerID=8YFLogxK

U2 - 10.1016/j.ssi.2015.01.001

DO - 10.1016/j.ssi.2015.01.001

M3 - Article

AN - SCOPUS:84939973941

VL - 275

SP - 23

EP - 28

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -