Zusammenfassung
The main object of this work is to study two materials with giant
dielectric constants: CaCu3Ti4O12 (CCTO) and Ca0.7Bi0.3Ti0.7Cr0.3O3
(CBTC). CBTC1-x-CCTOx composites were also obtained to create a new
dielectric material with dielectric properties between these two phases.
Structural properties were studied by x-ray powder diffraction (XRPD),
Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and
dielectric measurements. CCTO showed a cubic phase and CBTC an
orthorhombic phase. An interesting result was that the dielectric
constant (K) did not follow the rule of the mixture of Lichtnecker, and
this happened due to the presence of other phases of its crystalline
structure, which decreases the value of K when compared to the predicted
values of Lichtnecker. It was also found that the dielectric properties
of the composite are very promising for use in microelectronics,
according to the miniaturization factor, which is crucial for those
applications.
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