Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu 0.01)O3-δ

Jong Ho Lee; Sung Min Choi; Jong Heun Lee; Jongsup Hong; Hyounchul Kim; Kyung Joong Yoon; Byung Kook Kim

doi:10.1016/j.ijhydene.2014.02.072

Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr_0.84Y_0.15Cu _0.01)O_3-δ

Jong Ho Lee, Sung Min Choi, Jong Heun Lee, Jongsup Hong, Hyounchul Kim, Kyung Joong Yoon, Byung Kook Kim

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

47 Citations (Scopus)

Abstract

The phase stability and electrical conductivity of a proton-conducting oxide, Ba(Zr_0.84Y_0.15Cu_0.01)O _3-δ (BZYCu), sintered under various atmospheres was systematically investigated. The partial pressures of oxygen (PO₂) and barium (P_Ba) were used as the tunable experimental parameters to control the surrounding atmosphere during sintering. According to the analysis, the potentially volatile species BaCO₃, formed by the decomposition of BZYCu under a CO₂-containing atmosphere at around 600 °C, was found to induce barium losses by evaporation. These barium losses, and the associated Y₂O₃ segregation, were the decisive factor in determining the phase stability and electrical conductivity of the resulting BZYCu; both of these properties deteriorated with barium evaporation. Maintaining the optimum balance of PO₂ and P_Ba during sintering is crucial for minimizing Y₂O₃ segregation by kinetically suppressing the volatilization of barium.

Original language	English
Pages (from-to)	7100-7108
Number of pages	9
Journal	International Journal of Hydrogen Energy
Volume	39
Issue number	13
DOIs	https://doi.org/10.1016/j.ijhydene.2014.02.072
Publication status	Published - 2014 Apr 24

Bibliographical note

Funding Information:
This research was supported by the Fusion Research Program for Green Technologies through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology ( 2011-0019297 ) and partially funded by the institutional research program of KIST .

Keywords

Barium evaporation
Electrical conductivity
Phase stability
Proton-conducting oxide

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2014.02.072

Cite this

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title = "Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu 0.01)O3-δ",

abstract = "The phase stability and electrical conductivity of a proton-conducting oxide, Ba(Zr0.84Y0.15Cu0.01)O 3-δ (BZYCu), sintered under various atmospheres was systematically investigated. The partial pressures of oxygen (PO2) and barium (PBa) were used as the tunable experimental parameters to control the surrounding atmosphere during sintering. According to the analysis, the potentially volatile species BaCO3, formed by the decomposition of BZYCu under a CO2-containing atmosphere at around 600 °C, was found to induce barium losses by evaporation. These barium losses, and the associated Y2O3 segregation, were the decisive factor in determining the phase stability and electrical conductivity of the resulting BZYCu; both of these properties deteriorated with barium evaporation. Maintaining the optimum balance of PO2 and PBa during sintering is crucial for minimizing Y2O3 segregation by kinetically suppressing the volatilization of barium.",

keywords = "Barium evaporation, Electrical conductivity, Phase stability, Proton-conducting oxide",

author = "Lee, {Jong Ho} and Choi, {Sung Min} and Lee, {Jong Heun} and Jongsup Hong and Hyounchul Kim and Yoon, {Kyung Joong} and Kim, {Byung Kook}",

note = "Funding Information: This research was supported by the Fusion Research Program for Green Technologies through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology ( 2011-0019297 ) and partially funded by the institutional research program of KIST .",

year = "2014",

month = apr,

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doi = "10.1016/j.ijhydene.2014.02.072",

language = "English",

volume = "39",

pages = "7100--7108",

journal = "International Journal of Hydrogen Energy",

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T1 - Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu 0.01)O3-δ

AU - Lee, Jong Ho

AU - Choi, Sung Min

AU - Lee, Jong Heun

AU - Hong, Jongsup

AU - Kim, Hyounchul

AU - Yoon, Kyung Joong

AU - Kim, Byung Kook

N1 - Funding Information: This research was supported by the Fusion Research Program for Green Technologies through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology ( 2011-0019297 ) and partially funded by the institutional research program of KIST .

PY - 2014/4/24

Y1 - 2014/4/24

N2 - The phase stability and electrical conductivity of a proton-conducting oxide, Ba(Zr0.84Y0.15Cu0.01)O 3-δ (BZYCu), sintered under various atmospheres was systematically investigated. The partial pressures of oxygen (PO2) and barium (PBa) were used as the tunable experimental parameters to control the surrounding atmosphere during sintering. According to the analysis, the potentially volatile species BaCO3, formed by the decomposition of BZYCu under a CO2-containing atmosphere at around 600 °C, was found to induce barium losses by evaporation. These barium losses, and the associated Y2O3 segregation, were the decisive factor in determining the phase stability and electrical conductivity of the resulting BZYCu; both of these properties deteriorated with barium evaporation. Maintaining the optimum balance of PO2 and PBa during sintering is crucial for minimizing Y2O3 segregation by kinetically suppressing the volatilization of barium.

AB - The phase stability and electrical conductivity of a proton-conducting oxide, Ba(Zr0.84Y0.15Cu0.01)O 3-δ (BZYCu), sintered under various atmospheres was systematically investigated. The partial pressures of oxygen (PO2) and barium (PBa) were used as the tunable experimental parameters to control the surrounding atmosphere during sintering. According to the analysis, the potentially volatile species BaCO3, formed by the decomposition of BZYCu under a CO2-containing atmosphere at around 600 °C, was found to induce barium losses by evaporation. These barium losses, and the associated Y2O3 segregation, were the decisive factor in determining the phase stability and electrical conductivity of the resulting BZYCu; both of these properties deteriorated with barium evaporation. Maintaining the optimum balance of PO2 and PBa during sintering is crucial for minimizing Y2O3 segregation by kinetically suppressing the volatilization of barium.

KW - Barium evaporation

KW - Electrical conductivity

KW - Phase stability

KW - Proton-conducting oxide

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