| Autor: | Y.D. Kolekar, Vikas L. Mathe, K. K. Patankar, A. N. Patil, S.A. Patil, P. B. Joshi, S. D. Lotke |
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| Rok vydání: | 2001 |
| Předmět: |
Permittivity
Materials science Condensed matter physics Magnetoelectric effect Dielectric Condensed Matter Physics Ferroelectricity Electronic Optical and Magnetic Materials Mechanics of Materials Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Materials Chemistry Ceramics and Composites Ferrite (magnet) Electrical and Electronic Engineering Composite material |
| Zdroj: | Journal of Electroceramics. 6:115-122 |
| ISSN: | 1385-3449 |
| DOI: | 10.1023/a:1011452616738 |
| Popis: | Magnetoelectric composites of CuFe1.8Cr0.2O4– Ba0.8Pb0.2TiO3 were prepared using high temperature solid-state reaction technique. X-ray structural analysis of these composites confirms the presence of both the phases in the composite. Detailed studies of dielectric properties (e′, tan δ and σac) as a function of frequency (100 Hz to 1 MHz) and temperature (30°C to 250°C) show that these compounds exhibit diffuse ferroelectric phase transitions. Results of ac conductivity, dc resistivity and thermoelectric power measurements show that conduction occurs by hopping of charge carriers. The magnetoelectric effect has been studied as a function of intensity of magnetic field. The electrical polarisation was induced in piezoelectric (Ba0.8Pb0.2TiO3) phase as result of strain induced in the ferrite (CuFe1.8Cr0.2O4) phase by the applied magnetic field. The Jahn-Teller distortion caused in the ferrite lattice by Jahn-Teller ions like Cu2+ and Cr3+ is also responsible for the elastic coupling of strain to the Ba0.8Pb0.2TiO3 phase. |
| Databáze: | OpenAIRE |
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