Structural, Dielectric, and Pyroelectric Properties of [(Pb_0.4Ba_0.6)(Ti_(1−3x/4)Sb_x/2Fe_x/4)O₃] Ferroelectrics

Modified ceramics [Pb _0.4 Ba _0.6 )(Ti_{(1− 3x/ 4)} Sbx_{/ 2}Fe_{x/ 4})O ₃ ] for x = 0 to 0.1 have been prepared using high temperature solid state reaction method. XRD and IR investigations of the samples have been performed. These studies show that the samples are homogeneous single-phase perovskite with tetragonal crystal structure. Dielectric behavior of these samples has also been investigated as function of frequency (1 kHz to 1 MHz) and temperature (30°C to 450°C). The role of Sb and Fe as modifiers of mainly the electrical properties such as dielectric constant, conductivity and pyroelectric coefficient are discussed in terms of the usefulness of these materials. The curie temperature shifts to the lower temperature side for increasing level of substitution. Results indicate that the ceramics in the range x = 0.04 to 0.05 could be useful candidate as a pyroelectric sensor.

Keywords:

• Ferroelectrics
• dielectric constant
• spontaneous polarization
• pyroelectric coefficient

Acknowledgments

Paper originally presented at AMF-4, Bangalore, India, December 12–15, 2003