Zusammenfassung
This work investigates the microstructure and magnetic dielectric
properties of the CaTiO3 (CTO) and Y3Fe5O12 (YIG) composite ceramic. CTO
is a paramagnetic ceramic, presents a positive value of Resonant
Frequency Temperature Coefficients (tau(f)) and has high dielectric
permittivity (epsilon(r)) while YIG is ferromagnetic, has low epsilon(r)
and negative tau(f) values. Therefore, it is expected that the composite
from these individual phase shows new properties, or a mix of them
derived from each component. X-ray powder diffraction (XRPD), Scanning
Electron Microscope (SEM), Raman and Fe-57 Mossbauer spectroscopy were
performed to confirm the phases of the composites. The dielectric and
magnetic properties in Radio-Microwave frequencies were studied by
impedance spectroscopy using different geometries. It was observed a
densification improvement resulting from the insertion of the CTO in
composites and a chemical reaction between YIG and CTO phases. This new
composite has potential applications in bulk and thick/thin films
devices. (C) 2015 Elsevier B.V. All rights reserved.
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