Tailored dielectric and magnetic properties of composite electroceramics with ferroelectric and ferrimagnetic components
| Autor: | Masoud Asadi-Zeydabadi, Richard G. Geyer |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Composite number Yttrium iron garnet General Physics and Astronomy 020206 networking & telecommunications 02 engineering and technology Dielectric 01 natural sciences Ferroelectricity 010309 optics chemistry.chemical_compound chemistry Ferrimagnetism visual_art 0103 physical sciences Barium titanate 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Ceramic Electroceramics Composite material |
| Zdroj: | Journal of Applied Physics. 124:164104 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.5046428 |
| Popis: | High-frequency coaxial waveguide measurements are used to evaluate composition- and frequency-dependent complex permittivities and permeabilities of polycrystalline ferroelectric and ferrimagnetic ceramics. Material dielectric and magnetic property measurements were performed on ferroelectric barium titanate (BaTiO3) and ferrimagnetic yttrium iron garnet (YIG), with the upper measurement frequency bound below gyromagnetic resonance of YIG. These polycrystalline materials were chosen because of their widespread use in voltage- and magnetic field-tunable devices. Wideband frequency material measurements were used to predict dielectric and magnetic properties of various two-phase composite media incorporating BaTiO3 and YIG. Two effective medium theories were used: an asymmetric, modified Maxwell-Garnett type and a symmetric Bruggeman model. The Bruggeman effective medium model is extended to include three-phases. The three-phase Bruggeman predictive model is employed when controlled porosity is introduced into the composite and when two component phases are combined with polytetrafluoroethylene. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|