| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1553666 | Superlattices and Microstructures | 2014 | 16 Pages |
•A Pb0.75K0.5Nb2O6 ceramic of single-phase TTB structure was prepared.•Analyze of electrical properties as function of frequency and temperature.•Modeling the complex impedance diagrams by the model of equivalent circuit.•Determination of activation energy.•Comparison of the obtained results with other TTB compounds.
Using conventional solid state synthesis under air, the sample Pb0.75K0.5Nb2O6 was prepared in a single-phase TTB structure as indicated from X-ray analysis. Impedance spectroscopy analysis of the dielectric properties of Pb0.75K0.5Nb2O6 ceramic were investigated in the frequency range, 1 Hz–1 MHz and in the temperature duration from room temperature to 550 °C.Impedance and modulus plots were used as tools to analyze the sample behavior as a function of frequency. Cole–Cole plots showed non-Debye relaxation. The nature of variation of the electrical conductivity, and value of activation energy of different temperature regions, suggest that the conduction process is of mixed-type (i.e., ionic polaronic and space charge generated from the oxygen ion vacancies). The structural and dielectric results are compared with three others TTB compounds derived from Pb0.75K0.5Nb2O6 (PKN) family: Pb1.85K1.15Li0.15Nb5O15 (PKLN), K3Li2Nb5O15 (KLN) and Pb1.8Gd0.1K1.1Nb5O15 (PGKN).
