Determination of electronic and ionic conductivity in mixed ionic conductors

HiTEC and in-situ impedance spectroscopy analysis of isovalent and aliovalent doped BaTiO3

Soonil Lee, Clive A. Randall

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The ionic and electronic conductivities of nonstoichiometric BaTiO 3 (undoped, Ca-doped, and Zr-doped BaTiO3-δ) ceramics were investigated through high temperature equilibrium conductivity (HiTEC) and in-situ impedance measurements at various equilibrium conditions with different oxygen partial pressures over a temperature range of 950-1050 C. Contribution of mobile oxygen vacancies on the electrical conductivity has been determined by HiTEC measurement as a function of oxygen partial pressure; the electrical conductivity with mobile oxygen vacancies shows a broad transition from p-type to n-type, and thereby there is an increase of the minimum conductivity at the n-p transition point. Through combining in-situ impedance spectroscopy measurements with the HiTEC measurements, it was confirmed clearly that the mobile oxygen vacancy contributes to the total conductivity, and the oxides become mixed conductors around the n-p transition regime (minimum electronic conductivity regime). It was found that Warburg impedance can be observed at the condition of tion/telectronic 0.05 in the temperature range of 950-1050 C and pO2 range of 0.95-10 - 16 atm. The ionic conductivity varied with the concentration of extrinsic oxygen vacancies and dopants, and the activation energy for mobility of oxygen vacancy in Ca-doped BaTiO3-δ was found to be 1.04 ± 0.05 eV using the two techniques in a very good agreement.

Original languageEnglish (US)
Pages (from-to)86-92
Number of pages7
JournalSolid State Ionics
Volume249-250
DOIs
StatePublished - Sep 5 2013

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Oxygen vacancies
Ionic conductivity
ion currents
conductors
Spectroscopy
impedance
conductivity
oxygen
electronics
spectroscopy
Partial pressure
Temperature
Oxygen
partial pressure
Oxides
electrical resistivity
impedance measurement
Activation energy
mixed oxides
transition points

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Determination of electronic and ionic conductivity in mixed ionic conductors: HiTEC and in-situ impedance spectroscopy analysis of isovalent and aliovalent doped BaTiO3",
abstract = "The ionic and electronic conductivities of nonstoichiometric BaTiO 3 (undoped, Ca-doped, and Zr-doped BaTiO3-δ) ceramics were investigated through high temperature equilibrium conductivity (HiTEC) and in-situ impedance measurements at various equilibrium conditions with different oxygen partial pressures over a temperature range of 950-1050 C. Contribution of mobile oxygen vacancies on the electrical conductivity has been determined by HiTEC measurement as a function of oxygen partial pressure; the electrical conductivity with mobile oxygen vacancies shows a broad transition from p-type to n-type, and thereby there is an increase of the minimum conductivity at the n-p transition point. Through combining in-situ impedance spectroscopy measurements with the HiTEC measurements, it was confirmed clearly that the mobile oxygen vacancy contributes to the total conductivity, and the oxides become mixed conductors around the n-p transition regime (minimum electronic conductivity regime). It was found that Warburg impedance can be observed at the condition of tion/telectronic 0.05 in the temperature range of 950-1050 C and pO2 range of 0.95-10 - 16 atm. The ionic conductivity varied with the concentration of extrinsic oxygen vacancies and dopants, and the activation energy for mobility of oxygen vacancy in Ca-doped BaTiO3-δ was found to be 1.04 ± 0.05 eV using the two techniques in a very good agreement.",
author = "Soonil Lee and Randall, {Clive A.}",
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T2 - HiTEC and in-situ impedance spectroscopy analysis of isovalent and aliovalent doped BaTiO3

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AU - Randall, Clive A.

PY - 2013/9/5

Y1 - 2013/9/5

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AB - The ionic and electronic conductivities of nonstoichiometric BaTiO 3 (undoped, Ca-doped, and Zr-doped BaTiO3-δ) ceramics were investigated through high temperature equilibrium conductivity (HiTEC) and in-situ impedance measurements at various equilibrium conditions with different oxygen partial pressures over a temperature range of 950-1050 C. Contribution of mobile oxygen vacancies on the electrical conductivity has been determined by HiTEC measurement as a function of oxygen partial pressure; the electrical conductivity with mobile oxygen vacancies shows a broad transition from p-type to n-type, and thereby there is an increase of the minimum conductivity at the n-p transition point. Through combining in-situ impedance spectroscopy measurements with the HiTEC measurements, it was confirmed clearly that the mobile oxygen vacancy contributes to the total conductivity, and the oxides become mixed conductors around the n-p transition regime (minimum electronic conductivity regime). It was found that Warburg impedance can be observed at the condition of tion/telectronic 0.05 in the temperature range of 950-1050 C and pO2 range of 0.95-10 - 16 atm. The ionic conductivity varied with the concentration of extrinsic oxygen vacancies and dopants, and the activation energy for mobility of oxygen vacancy in Ca-doped BaTiO3-δ was found to be 1.04 ± 0.05 eV using the two techniques in a very good agreement.

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