Abstract
CaCu 2.9Fe 0.1Ti 4O 12 (CCFTO) has been prepared by a novel semi-wet route and its dielectric properties have been studied in the temperature range 300–500 K. It is found that dielectric constant ( ɛ) decreases drastically in the frequency range 100 Hz to 1 MHz. Complex plane impedance and modulus analysis was done to understand this drastic decrease in ɛ. Oxidation state of various ions was studied using X-ray photoelectron spectroscopy (XPS). The decrease in the permittivity of CCFTO can be attributed to two factors: the suppression of the Ca/Cu disorder in CCFTO which is observed in CaCu 3Ti 4O 12 (CCTO) and the absence of the grain boundary internal barrier layer capacitance mechanism.
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