SANZ-ORTIZ, Marta N.; RODRÍGUEZ, Fernando; DEMAZEAU, Gérard

doi:10.1080/08957950802552119

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SANZ-ORTIZ, Marta N.
Universidad de Cantabria [Santander] = University of Cantabria [Spain] = Université de Cantabrie [Espagne] [UC / UniCan]

RODRÍGUEZ, Fernando
Universidad de Cantabria [Santander] = University of Cantabria [Spain] = Université de Cantabrie [Espagne] [UC / UniCan]

DEMAZEAU, Gérard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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High Pressure Research. 2008, vol. 28, n° 4, p. 571-576

Taylor & Francis

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This work investigates the electronic structure of CoF3 by optical absorption and its relationship with the ground-state spin and the Jahn-Teller (JT) effect exhibited by Co3+(d6) in octahedral coordination (CoF6)3-. The results are compared with other Co3+ fluorides and oxides, where Co3+ is high spin (HS) and low spin (LS), respectively. In CoF3 we detect an absorption band with a doublet structure at 1.89eV (657nm) and 1.45eV (855nm) at 2.5GPa, which is associated with the T e JT effect on the 5T2 HS ground state. Absorption measurements under pressure have been carried out around the HS-LS (5T2 1A1) spin crossover transition in the 0-20 GPa range. We show that the JT effect is stable in a wide pressure range. No sign of intermediate spin (3T1, 2 states) is observed in the explored pressure range.< Leer menos

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Cobalt

CoF3

Intermediate spin

Jahn-Teller effect

Spin crossover

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Spin transition in Co3+ by optical absorption and time-resolved spectroscopy under pressure: An appraisal of the different spin states

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