New Remarks on the High-Polarizability Perovskite-Related Material CaCu3Ti4O12
| Autor: | M Bini, M. C. Mozzati, E Giulotto, Vincenzo Massarotti, C. B. Azzoni, Doretta Capsoni |
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| Rok vydání: | 2004 |
| Předmět: |
Permittivity
Materials science Condensed Matter Physics Electronic Optical and Magnetic Materials Calcium titanate chemistry.chemical_compound Magnetization symbols.namesake Crystallography Delocalized electron Nuclear magnetic resonance chemistry Polarizability symbols Raman spectroscopy Raman scattering Perovskite (structure) |
| Zdroj: | Ferroelectrics. 298:61-67 |
| ISSN: | 1563-5112 0015-0193 |
| Popis: | We present results from Raman scattering, EPR and static magnetization measurements in CaCu 3 Ti 4 O 12 , a perovskite-related material characterized by a colossal dielectric permittivity e 0 . The investigated samples were pure and partially substituted in the octahedral Ti sites by other transition metals. The results from the pure material are interpreted in terms of the presence of delocalized Copper-holes. Substitutions in the Ti sites drastically change the magnetic properties and, most evidently in the case of Cr, also affect the Raman spectra. These effects correlate with the known suppression of the colossal e 0 after the same kind of substitutions. |
| Databáze: | OpenAIRE |
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