Journal
PHASE TRANSITIONS
Volume 86, Issue 7, Pages 715-725Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01411594.2012.726727
Keywords
functionally graded; oxide-polymer composite; complex permittivity
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Funding
- Romanian CNCS-UEFISCDI project [PN-II-ID-PCE-2011-3-0745]
- Romanian CNCS-UEFISCDI under the RAMTECH centre [162/15.06.2010]
- [POSDRU/89/1.5/S/63663]
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The preparation and properties of compositionally graded PbTiO3 (PT)-epoxy resin (EPR) composite thick films are reported in this study. Various graded specimens were prepared using gravity casting method by embedding PT powders into the EPR matrix. The existence of a graded structure with two distinct phases, a good intermixing, some air pores, and different morphologies, was confirmed by scanning electron microscopy micrographs. The dielectric constants of these composites have values in the range 5-12 at the frequency of approximate to 10(4)Hz and about 3-13 at approximate to 5x10(8)Hz. The composites with permittivity gradient act as a natural impedance match system in the frequency range 2-4GHz, resulting in very low reflections. Therefore, the compositionally graded PT-EPR composite thick films are suitable as adapting impedance materials for microwave applications.
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