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Abstract
(Li,Ce) modified Na0.5Bi2.5Nb2O9 (NBN) Aurivillius type ceramics were synthesized by conventional mixed-oxide routes. The electrical properties of NBN-based ceramics were characterized in a wide range of frequency (100 Hz-1 MHz) and temperatures (500–750°C) by impedance spectrum techniques. It was found that the electrical conductivity and corresponding relaxation process were thermally activated, and the basic mechanisms were attributed to the hopping of oxygen vacancies in the grain interior. The decrease of resistivity and activation energy was indicative of the introduction of extra oxygen vacancies induced by (Li,Ce) dopants into NBN-based ceramics. In addition, the frequency dispersion of the dielectric behavior of NBN-based ceramics was owing to the space charge polarization at high temperature, as confirmed by impedance spectroscopies.
Acknowledgments
This work was supported by the Natural Science Foundation of China (u0837605 and 61201064).
Notes
†Both of Fengkang Huang and Zhihang Peng are co-first authors. They contributed equally to this work.