Sr2(Mg1-xGax)Ge2O7+0.5x: Melilite-type oxygen ionic conductor associated with fivefold coordinated germanium and gallium

Hee Jung Park, Tae Gon Kim, Chan Kwak, Doh Won Jung, Sangmock Lee, Kyu Hyoung Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We demonstrate a new type of oxygen ionic conductor, Sr2(Mg1-xGax)Ge2O7+0.5x with a melilite-type structure. The oxygen-ion conductivity of Sr2Mg0.8Ga0.2Ge2O7.1 is measured as 10-4 S/cm at 800°C using both 2-probe ac impedance and 4-probe dc measurements, and hardly depends on Po2 indicating that the main charge carriers are interstitial oxygen ions. Based on total energy calculations, it is suggested that a Ge4+ ion as well as Ga3+ contributes to the ionic conduction of interstitial oxygen through the coordination changes from fourfold to fivefold.

Original languageEnglish
Pages (from-to)884-887
Number of pages4
JournalJournal of Power Sources
Volume275
DOIs
Publication statusPublished - 2015 Feb 1

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Germanium
Gallium
oxygen ions
gallium
germanium
interstitials
conductors
impedance probes
Oxygen
oxygen
Ions
charge carriers
Ionic conduction
conduction
conductivity
probes
Charge carriers
ions
energy

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Park, Hee Jung ; Kim, Tae Gon ; Kwak, Chan ; Jung, Doh Won ; Lee, Sangmock ; Lee, Kyu Hyoung. / Sr2(Mg1-xGax)Ge2O7+0.5x : Melilite-type oxygen ionic conductor associated with fivefold coordinated germanium and gallium. In: Journal of Power Sources. 2015 ; Vol. 275. pp. 884-887.
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abstract = "We demonstrate a new type of oxygen ionic conductor, Sr2(Mg1-xGax)Ge2O7+0.5x with a melilite-type structure. The oxygen-ion conductivity of Sr2Mg0.8Ga0.2Ge2O7.1 is measured as 10-4 S/cm at 800°C using both 2-probe ac impedance and 4-probe dc measurements, and hardly depends on Po2 indicating that the main charge carriers are interstitial oxygen ions. Based on total energy calculations, it is suggested that a Ge4+ ion as well as Ga3+ contributes to the ionic conduction of interstitial oxygen through the coordination changes from fourfold to fivefold.",
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Sr2(Mg1-xGax)Ge2O7+0.5x : Melilite-type oxygen ionic conductor associated with fivefold coordinated germanium and gallium. / Park, Hee Jung; Kim, Tae Gon; Kwak, Chan; Jung, Doh Won; Lee, Sangmock; Lee, Kyu Hyoung.

In: Journal of Power Sources, Vol. 275, 01.02.2015, p. 884-887.

Research output: Contribution to journalArticle

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T1 - Sr2(Mg1-xGax)Ge2O7+0.5x

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AU - Park, Hee Jung

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AU - Jung, Doh Won

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AU - Lee, Kyu Hyoung

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AB - We demonstrate a new type of oxygen ionic conductor, Sr2(Mg1-xGax)Ge2O7+0.5x with a melilite-type structure. The oxygen-ion conductivity of Sr2Mg0.8Ga0.2Ge2O7.1 is measured as 10-4 S/cm at 800°C using both 2-probe ac impedance and 4-probe dc measurements, and hardly depends on Po2 indicating that the main charge carriers are interstitial oxygen ions. Based on total energy calculations, it is suggested that a Ge4+ ion as well as Ga3+ contributes to the ionic conduction of interstitial oxygen through the coordination changes from fourfold to fivefold.

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