Abstract
Tri (Dy 3 + ) and pentavalent (Nb+5) modified new polycrystalline material of Aurivillius family (Dy 0.75 Bi 3.25 Ti 2.9625 Nb 0.03 O 12 ) was prepared by solid-state reaction method and the lattice parameters were calculated by using X-ray diffractogram. Impedance measurements were carried out from room temperature to 500°C in the frequency range of 100 Hz to 1 M Hz. Impedance spectroscopic plots show non-Debye type and detailed ac-conductivity analysis was also employed to understand the heterogeneity of the present electro-ceramics. The results were corroborated with the proposed defect formula and in addition, thermal stimulated current measurements show that the present sample has an excellent pyroelectric response.
Acknowledgments
NVP thanks Department of Science and Technology, New Delhi for sanctioning the SERC-DST Fast track Young Scientist Proposals (SR/FTP/PS-32/2003) and SAGTE, Vijayawada for giving constant encouragement.