Synthesis and characterization of (BTO)0.2-(CCTO)0.8 nanocomposite thick films

Abstract

Dual phase (Bi4Ti3O12)0.2-(CaCu3Ti4O12)0.8 {(BTO)0.2-(CCTO)0.8} nanocomposite powder was synthesized via a low cost auto-combustion method. Nancomposite powder was modified in the form of a thick layer (50 μm) over the alumina ceramic substrate using screen printing technique. The structural, morphological, functional and electrical properties of the dielectric thick film have been observed. The XRD spectra confirm the coexistence of dual phase composite systems with proper ratios. The particle size was significantly smaller and very few un-melted particles were observed from FESEM analysis of the thick film. Vibrational modes present in the composite film were confirmed with the help of FTIR spectrum. The (BTO)0.2-(CCTO)0.8 shows an unusual behaviour of high dielectric constant (∼243) and dielectric loss (∼5.9) at low frequency as well as room temperature. The understanding of this amazing dielectric behaviour opens the new way of nanocomposite thick films which can be used as a dielectric substrate for microstrip antenna fabrication.