Piskunov, Sergej; Heifets, Eugene; Jacob, Timo; Kotomin, Eugene A.; Ellis, Donald E.; Spohr, Eckhard:
Electronic structure and thermodynamic stability of LaMnO3 and La1-xSrxMnO3 (001) surfaces: Ab initio calculations.
2008
In: Physical Review / B, Condensed matter and materials physics, Jg. 78 (2008), Heft 12, 121406(R)
Artikel/Aufsatz in Zeitschrift / Fach: Chemie
Fakultät für Chemie
Titel:
Electronic structure and thermodynamic stability of LaMnO3 and La1-xSrxMnO3 (001) surfaces: Ab initio calculations.
Autor(in):
Piskunov, Sergej; Heifets, Eugene; Jacob, Timo; Kotomin, Eugene A.; Ellis, Donald E.; Spohr, Eckhard im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr:
2008
Erschienen in:
Physical Review / B, Condensed matter and materials physics, Jg. 78 (2008), Heft 12, 121406(R)
ISSN:
ISSN:
ISSN:
DOI:
Signatur der UB:

Abstract:

We present the results of ab initio hybrid density-functional calculations of the atomic and the electronic structures of LaMnO3 (LMO) and La1-xbSrxbMnO3 (001) surfaces. The total energies obtained from these calculations were used to analyze thermodynamic stability of the surfaces. We predict Sr and O vacancy segregation to the surface to occur with similar energies ( ˜0.5eV per defect). In pure LMO only MnO2 termination is thermodynamically favorable under typical operational conditions of a cathode in solid oxide fuel cells, whereas Sr doping makes La(Sr)O termination favorable. Finally, the role of Sr doping in cathode degradation is discussed.