High Oxygen Ion Conduction in Sintered Oxides of the Bi2O3-Dy2O3 System

M.J. Verkerk; A.J. Burggraaf

doi:10.1149/1.2127391

High Oxygen Ion Conduction in Sintered Oxides of the Bi₂O₃-Dy₂O₃ System

M.J. Verkerk, A.J. Burggraaf

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Abstract

The phase diagram of the Bi₂O₃-Dy₂O₃ system was investigated. A monophasicfcc structure was stabilized for samples containing 28.5–50.0 mole percent (m/o) Dy₂O₃. Above and below this concentration range polyphasic regionsappear. The fcc phase showed high oxygen ion conduction. The ionictransference number is equal to one for specimens containing 28.5–40.0 m/o Dy₂O₃, whereas an electronic component is introduced at low temperaturesfor specimens containing 50.0 m/o Dy₂O₃. The conductivity of (Bi₂O₃)_0.715(Dy₂O₃)_0.285 is 0.71 Ω^–1m^–1 and 14.4 Ω^–1m^–1 at 773 and 973 K, respectively.Relations were found between the ionic radius, the conductivity, and the minimumconcentration of lanthanide necessary to stabilize the fcc phase. It is concludedthat the highest ionic conductivity will be found in the system Bi₂O₃-Er₂O₃or Bi₂O₃-Tm₂O₃. From a study of relations between the activation energy, log σ₀ and the composition it is concluded that two conductivity mechanismsplay a role.

Original language	English
Pages (from-to)	75-82
Journal	Journal of the Electrochemical Society
Volume	128
Issue number	1
DOIs	https://doi.org/10.1149/1.2127391
Publication status	Published - 1981

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title = "High Oxygen Ion Conduction in Sintered Oxides of the Bi2O3-Dy2O3 System",

abstract = "The phase diagram of the Bi2O3-Dy2O3 system was investigated. A monophasicfcc structure was stabilized for samples containing 28.5–50.0 mole percent (m/o) Dy2O3. Above and below this concentration range polyphasic regionsappear. The fcc phase showed high oxygen ion conduction. The ionictransference number is equal to one for specimens containing 28.5–40.0 m/o Dy2O3, whereas an electronic component is introduced at low temperaturesfor specimens containing 50.0 m/o Dy2O3. The conductivity of (Bi2O3)0.715(Dy2O3)0.285 is 0.71 Ω–1m–1 and 14.4 Ω–1m–1 at 773 and 973 K, respectively.Relations were found between the ionic radius, the conductivity, and the minimumconcentration of lanthanide necessary to stabilize the fcc phase. It is concludedthat the highest ionic conductivity will be found in the system Bi2O3-Er2O3or Bi2O3-Tm2O3. From a study of relations between the activation energy, log σ0 and the composition it is concluded that two conductivity mechanismsplay a role.",

author = "M.J. Verkerk and A.J. Burggraaf",

year = "1981",

doi = "10.1149/1.2127391",

language = "English",

volume = "128",

pages = "75--82",

journal = "Journal of the Electrochemical Society",

issn = "0013-4651",

publisher = "Institute of Physics",

number = "1",

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TY - JOUR

T1 - High Oxygen Ion Conduction in Sintered Oxides of the Bi2O3-Dy2O3 System

AU - Verkerk, M.J.

AU - Burggraaf, A.J.

PY - 1981

Y1 - 1981

N2 - The phase diagram of the Bi2O3-Dy2O3 system was investigated. A monophasicfcc structure was stabilized for samples containing 28.5–50.0 mole percent (m/o) Dy2O3. Above and below this concentration range polyphasic regionsappear. The fcc phase showed high oxygen ion conduction. The ionictransference number is equal to one for specimens containing 28.5–40.0 m/o Dy2O3, whereas an electronic component is introduced at low temperaturesfor specimens containing 50.0 m/o Dy2O3. The conductivity of (Bi2O3)0.715(Dy2O3)0.285 is 0.71 Ω–1m–1 and 14.4 Ω–1m–1 at 773 and 973 K, respectively.Relations were found between the ionic radius, the conductivity, and the minimumconcentration of lanthanide necessary to stabilize the fcc phase. It is concludedthat the highest ionic conductivity will be found in the system Bi2O3-Er2O3or Bi2O3-Tm2O3. From a study of relations between the activation energy, log σ0 and the composition it is concluded that two conductivity mechanismsplay a role.

AB - The phase diagram of the Bi2O3-Dy2O3 system was investigated. A monophasicfcc structure was stabilized for samples containing 28.5–50.0 mole percent (m/o) Dy2O3. Above and below this concentration range polyphasic regionsappear. The fcc phase showed high oxygen ion conduction. The ionictransference number is equal to one for specimens containing 28.5–40.0 m/o Dy2O3, whereas an electronic component is introduced at low temperaturesfor specimens containing 50.0 m/o Dy2O3. The conductivity of (Bi2O3)0.715(Dy2O3)0.285 is 0.71 Ω–1m–1 and 14.4 Ω–1m–1 at 773 and 973 K, respectively.Relations were found between the ionic radius, the conductivity, and the minimumconcentration of lanthanide necessary to stabilize the fcc phase. It is concludedthat the highest ionic conductivity will be found in the system Bi2O3-Er2O3or Bi2O3-Tm2O3. From a study of relations between the activation energy, log σ0 and the composition it is concluded that two conductivity mechanismsplay a role.

U2 - 10.1149/1.2127391

DO - 10.1149/1.2127391

M3 - Article

SN - 0013-4651

VL - 128

SP - 75

EP - 82

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

IS - 1

ER -

High Oxygen Ion Conduction in Sintered Oxides of the Bi2O3-Dy2O3 System

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High Oxygen Ion Conduction in Sintered Oxides of the Bi₂O₃-Dy₂O₃ System