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 language | English |
|---|---|
| Pages (from-to) | 884-887 |
| Number of pages | 4 |
| Journal | Journal of Power Sources |
| Volume | 275 |
| DOIs | |
| Publication status | Published - 2015 Feb 1 |
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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
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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 journal › Article
TY - JOUR
T1 - Sr2(Mg1-xGax)Ge2O7+0.5x
T2 - Melilite-type oxygen ionic conductor associated with fivefold coordinated germanium and gallium
AU - Park, Hee Jung
AU - Kim, Tae Gon
AU - Kwak, Chan
AU - Jung, Doh Won
AU - Lee, Sangmock
AU - Lee, Kyu Hyoung
PY - 2015/2/1
Y1 - 2015/2/1
N2 - 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.
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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U2 - 10.1016/j.jpowsour.2014.11.088
DO - 10.1016/j.jpowsour.2014.11.088
M3 - Article
AN - SCOPUS:84911921302
VL - 275
SP - 884
EP - 887
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -