Impedance and Pyroelectric Measurements on Dy_0.75Bi_3.25Ti_2.9625Nb_0.03O₁₂ Ceramics

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.

Keywords:

• Impedance spectroscopy
• master plots
• ac-conductivity
• Jonscher's modified law
• pyroelectric

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.