DFT + U Study of Uranium Dioxide and Plutonium Dioxide with Occupation Matrix Control.
J Phys Chem C Nanomater Interfaces
; 126(27): 11426-11435, 2022 Jul 14.
Article
en En
| MEDLINE
| ID: mdl-35865792
ABSTRACT
DFT + U with occupation matrix control (OMC) is applied to study computationally bulk UO2 and PuO2, the latter for the first time. Using the PBESol functional in conjunction with OMC locates AFM and NM ground states for UO2 and PuO2, respectively, in agreement with experimental findings. By simulating the lattice parameter, magnetic moment, band gap, and densities of states, U = 4.0 eV is recommended for AFM UO2, yielding data close to experiments for all considered properties. U = 4.5 and 4.0 eV are recommended for NM and AFM PuO2, respectively, though much larger U values (c. 10 eV) are required to yield the most recently reported PuO2 band gap. For both oxides, several excited states have similar properties to the ground state, reinforcing the need to employ OMC wherever possible.
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Colección:
01-internacional
Base de datos:
MEDLINE
Aspecto:
Determinantes_sociais_saude
Idioma:
En
Revista:
J Phys Chem C Nanomater Interfaces
Año:
2022
Tipo del documento:
Article
País de afiliación:
Reino Unido