Size effects on the dielectric properties of barium titanate (BaTiO3) at microwave frequencies
| Autor: | Sei-Joo Jang, Robert E. Newnham, Mark P. McNeal |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Polypropylene
Materials science Dielectric Condensed Matter Physics Hydrothermal circulation Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry visual_art Barium titanate visual_art.visual_art_medium Particle size Ceramic Composite material Electrical impedance Microwave |
| Zdroj: | Ferroelectrics. 211:153-164 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150199808232340 |
| Popis: | Dielectric measurements on BaTiO3 ceramics and BaTiO3 powder-polypropylene composites were carried out in the microwave frequency range. Lumped impedance, cavity perturbation, and post resonance techniques were employed through 5GHz. Ceramic BaTiO3 exhibited a large relaxation with a peak in the loss centered at 771 MHz. Dielectric dispersion was also evident in the composites fabricated with ∼1 μm TAM HPB BaTiO3 powder, which exhibited a loss peak at 1.5 GHz. Composites fabricated with ∼0.1 um Cabot BT-8 hydrothermal powder, showed a broader relaxation over the measured frequency range, with a loss peak centered at 3.2 GHz. The shift in relaxation frequency can be attributed to the reduction in particle size and subsequent modulation of the domain structure. |
| Databáze: | OpenAIRE |
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