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
The analysis of the infrared and ligand field spectra of COM2O4 spinels reveals that the ionicity of these compounds varies in the following order aluminate > gallate > ferrite and chromite > rhodite and cobaltite. A linear relation has been established between the Δ(LO-TO)1 splitting, Raca...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
1998-01-01
|
| Series: | Active and Passive Electronic Components |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/1998/16871 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850107156809908224 |
|---|---|
| author | F. Hochu M. Lenglet |
| author_facet | F. Hochu M. Lenglet |
| author_sort | F. Hochu |
| collection | DOAJ |
| description | The analysis of the infrared and ligand field spectra of COM2O4 spinels reveals that the
ionicity of these compounds varies in the following order aluminate > gallate > ferrite
and chromite > rhodite and cobaltite. A linear relation has been established between
the Δ(LO-TO)1 splitting, Racah parameter and the ionic-covalent parameter SSp=ΣICP+tetra∑ICPocta. The influence of strong superexchange interactions on
the optical spectrum of cobalt ferrites has been studied. The cation distribution has been
established by EXAFS and XANES measurements. The cluster (CoFeO10)15– is
characterized 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 is
overlapped by the MMCT band. This study and the reinvestigation of the iron(III)
electronic spectrum is ferrites may explain the magneto-optical properties of mixed
cobalt-ferrites. |
| format | Article |
| id | doaj-art-4c049151364e4518bf7d2ce1109bccfa |
| institution | OA Journals |
| issn | 0882-7516 1563-5031 |
| language | English |
| publishDate | 1998-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Active and Passive Electronic Components |
| spelling | doaj-art-4c049151364e4518bf7d2ce1109bccfa2025-08-20T02:38:39ZengWileyActive and Passive Electronic Components0882-75161563-50311998-01-0120316918710.1155/1998/16871Co(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 PropertiesF. Hochu0M. Lenglet1ENSTIMD, 941 Rue C. Bourseul, BP 838, Douai Cedex 59508, FranceLaboratorie d'Analyse de Spectroscopie et de Traitement de Surface des Matériaux, Université de Rouen, IUT, Mont saint Aignan Cedex 76821, FranceThe analysis of the infrared and ligand field spectra of COM2O4 spinels reveals that the ionicity of these compounds varies in the following order aluminate > gallate > ferrite and chromite > rhodite and cobaltite. A linear relation has been established between the Δ(LO-TO)1 splitting, Racah parameter and the ionic-covalent parameter SSp=ΣICP+tetra∑ICPocta. The influence of strong superexchange interactions on the optical spectrum of cobalt ferrites has been studied. The cation distribution has been established by EXAFS and XANES measurements. The cluster (CoFeO10)15– is characterized 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 is overlapped by the MMCT band. This study and the reinvestigation of the iron(III) electronic spectrum is ferrites may explain the magneto-optical properties of mixed cobalt-ferrites.http://dx.doi.org/10.1155/1998/16871Cobalt ferritesoptical propertiesmagneto-optical effect. |
| spellingShingle | F. Hochu M. Lenglet 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 Active and Passive Electronic Components Cobalt ferrites optical properties magneto-optical effect. |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Cobalt ferrites optical properties magneto-optical effect. |
| url | http://dx.doi.org/10.1155/1998/16871 |
| work_keys_str_mv | AT fhochu coiiopticalabsorptioninspinelsinfraredandligandfieldspectroscopicstudyoftheionicityofthebondmagneticstructureandco2fe3mmctinferritescorrelationwiththemagnetoopticalproperties AT mlenglet coiiopticalabsorptioninspinelsinfraredandligandfieldspectroscopicstudyoftheionicityofthebondmagneticstructureandco2fe3mmctinferritescorrelationwiththemagnetoopticalproperties |