Co(II) Optical Absorption in Spinels: Infrared and Ligand-Field Spectroscopic Study of the Ionicity of the bond. Magnetic Structure and Co2+→Fe3+MMCT in Ferrites. Correlation with the Magneto-Optical Properties | Zendy

F. Hochu | Zendy; M. Lenglet | Zendy

Open Access

Co(II) Optical Absorption in Spinels: Infrared and Ligand-Field Spectroscopic Study of the Ionicity of the bond. Magnetic Structure and Co²⁺→Fe³⁺MMCT in Ferrites. Correlation with the Magneto-Optical Properties

Author(s) -

F. Hochu,

M. Lenglet

Publication year - 1997

Publication title -

active and passive electronic components

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.144

H-Index - 22

eISSN - 1026-7034

pISSN - 0882-7516

DOI - 10.1155/1998/16871

Subject(s) - chemistry , materials science

The analysis of the infrared and ligand field spectra of COM2O4 spinels reveals that theionicity of these compounds varies in the following order aluminate > gallate > ferriteand chromite > rhodite and cobaltite. A linear relation has been established betweenthe Δ(LO-TO)1 splitting, Racah parameter and the ionic-covalent parameter SSp=ΣICP+tetra∑ICPocta. The influence of strong superexchange interactions onthe optical spectrum of cobalt ferrites has been studied. The cation distribution has beenestablished by EXAFS and XANES measurements. The cluster (CoFeO10)15– ischaracterized by a large MMCT transition Co2+→Fe3+ at 1.65–1.7 eV (FWMH:1.35–1.95 eV). The 4A2→4T1 (P) tetrahedral cobalt(II) in ferrimagnetic compounds isoverlapped by the MMCT band. This study and the reinvestigation of the iron(III)electronic spectrum is ferrites may explain the magneto-optical properties of mixedcobalt-ferrites

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