Relaxor behavior in Y2/3Cu3Ti4O12ceramic

Abstract

Yttrium copper titanate (Y2/3Cu3Ti4O12) (YCTO) nanoceramic was fabricated by the semiwet route using metal nitrate solutions and powder of TiO2 in stoichiometric ratio. The dielectric and ferroelectric properties of YCTO were investigated within the temperature range of 308-500 K and frequency range of 2 Hz-5 MHz. A characteristic dielectric anomaly was observed from 350 to 425 K. YCTO exhibited a broad dielectric peak which got suppressed and shifted to higher frequency region with increasing temperature. The low temperature frequency dispersion may be assigned to the slowing down of dipolar fluctuations within the polar nanoclusters of YCTO. This dielectric anomaly can be assigned to a relaxor ferroelectric behavior. Such broad dielectric peak in the ϵ ′-T plot can be well fitted by a modified Curie-Weiss law. Additionally, the presence of a broad maximum in the ϵ ″-log f plot or tan δ-log f plot and a slim polarization-electric field (P-E) hysteresis loop also suggests the existence of a relaxor ferroelectric behavior in the ceramics. © 2017 ICE Publishing: All rights reserved.