Large-scale ab initio simulations of Fe-doped SrTiO3 perovskites
Autor(en): | Evarestov, R.A. Eglitis, R.I. Piskunov, S. Kotomin, E.A. Borstel, G. |
Stichwörter: | Boundary conditions; Chemical bonds; Computer simulation; Doping (additives); Electron energy levels; Ions; Iron; Lattice vibrations; Relaxation processes; Strontium compounds, Hartree-Fock method, Perovskite | Erscheinungsdatum: | 2002 | Herausgeber: | Materials Research Society | Journal: | Materials Research Society Symposium - Proceedings | Volumen: | 731 | Startseite: | 237 | Seitenende: | 242 | Zusammenfassung: | Using the Unrestricted Hartree-Fock method and supercells containing up to 160 atoms, we calculated the energy level positions in the gap and atomic geometry for the Fe4+ impurity substituting for a host Ti atom in SrTiO3. In agreement with experiment, the high spin (S=2) state is much lower in energy than the zero-spin state. The energy level positions strongly depend on the asymmetric displacement mode of the six nearest O ions which is a combination of the Jahn-Teller and breathing modes. A considerable covalent bonding between the Fe ion and four nearest O ions takes place. |
Beschreibung: | Conference of Modeling and Numerical Simulation of Materials Behavior and Evolution ; Conference Date: 2 April 2002 Through 5 April 2002; Conference Code:60427 |
ISSN: | 02729172 | DOI: | 10.1557/proc-731-w3.12 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036456854&doi=10.1557%2fproc-731-w3.12&partnerID=40&md5=2bc715f62f31e7f4812606a83b301483 |
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