Volume and bond length dependences of the electronic structure of 6-fold and 8-fold coordinated Co2+ in pressure transformed CoF2
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Barreda Argüeso, José Antonio; Aguado Menéndez, Fernando; González Gómez, Jesús Antonio; Valiente Barroso, Rafael; Nataf, L.; Sanz Ortiz, Marta Norah; Rodríguez González, FernandoFecha
2017Derechos
Attribution 4.0 International
Publicado en
Journal of Physics: Conference Series, 2017, 950, 042016
Editorial
Institute of Physics
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Resumen/Abstract
This work reports an optical absorption study on CoF2 under high-pressure conditions in the 0-80 GPa range. A recent structural study1 performed on the pressure-induced phase-transition sequence of CoF2 reveals that this compound undergoes a structural transformation associated with a change of Co2+ coordination from 6 (rutile type) to 8 (fluorite type) at 15 GPa, what implies a profound change in the Co2+ electronic ground state associated with the inversion of d orbitals from (t 2g 5 e g2) to (e g 4 t 2g 3). This allows us to explore the Co2+ electronic structure, and hence 10Dq, as a function of the density and the Co-F bond length in both CoF6 (rutile phase) and CoF8 (fluorite phase) coordinations. The results are compared with those obtained in KCoF3 (perovskite) in a wide range of Co-F distances (from 2.04 to 1.83 Å).
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