Bermúdez-Baños, Luis A.

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Síntesis y caracterización de materiales en el sistema Ca1-xRxCu3Ti4O12 (R = Mg, Sr, Zn)
(2004) Bermúdez-Baños, Luis A.; Tomar, Maharaj S.; College of Arts and Science - Science; Castellanos, Dorial; Marrero, Pablo; Department of Physics; Perales-Pérez, Oscar
Due to the high dielectric constant of CaCu3Ti4O12, there is interest in related material systems for high dielectric applications. Accordingly, becomes interesting to study the effect of some divalent cations replacing calcium cation in the host structure. We have synthesized Ca1-xRxCu3Ti4O12, (R represents Mg, Sr and Zn) powders and thin films by sol-gel route for different compositions (e.g. X=0, 0.1, 0.2...). Thin films were deposited by spin coating followed by thermal treatment at different temperatures. X-ray diffraction and Raman spectroscopy were used for structural characterization of this material both for powder and thin films. The results show the possibility to produce highly stochiometric films for the compositions x ≤ 0.7 for R in all the cases. Dielectric constant of this material for different compositions has been determined using the Impedance Analyzer HP4294a (1KHz to 110MHz). Frequency-dependent measurements at room temperature shows high dielectric constant (ε=73x103 for f=105Hz) for x = 0. 0 and 0.2 (Ca1-xMgxCu3Ti4O12).