First-principles calculations for Fe impurities in KNbO3

Autor(en): Postnikov, AV
Poteryaev, AI
Borstel, G
Stichwörter: BAND THEORY; DENSITY; doping; ELECTRONIC-STRUCTURE; ferroelectricity; INSULATORS; Materials Science; Materials Science, Multidisciplinary; photorefractive effect; Physics; Physics, Condensed Matter; STATE
Erscheinungsdatum: 1998
Herausgeber: GORDON BREACH SCI PUBL LTD
Journal: FERROELECTRICS
Volumen: 206
Ausgabe: 1-4
Startseite: 69
Seitenende: 78
Zusammenfassung: 
Nb-substituting Fe impurity in KNbO3 is studied in first-principles supercell calculations by the linear muffin-tin orbital method. Possible ways to account for the impurity charge compensation are discussed. Calculations are done in the local density approximation (LDA) and, for better description of Coulomb correlation effects within the localized impurity states, also in the LDA U scheme. The achievements and problems encountered in both approaches are analyzed. It is found that the impurity possess either a low-spin configuration (with 0 or 1 compensating electron), or a high-spin configuration (with 2 or 3 compensating electrons), the latter two apparently corresponding to practically relevant rechargeable impurity states.
Beschreibung: 
1997 Williamsburg Workshop on Ferroelectrics, WILLIAMSBURG, VIRGINIA, FEB 02-05, 1997
ISSN: 00150193
DOI: 10.1080/00150199808009150

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