Abstract
Single-phase Aurivillius Sm0.5Bi4.5Ti3FeO15 ceramics was synthesized by the conventional solid-state reaction technique. Dielectric response and electrical properties of the ceramics were investigated in a wide range of temperature and frequency by dielectric and impedance spectroscopies. Two dielectric relaxation behaviors were distinguished by the combination of impedance and electric modulus analysis which could be attributed to the contributions of grains and grain boundaries, respectively. The resistance of grain boundaries was found to be much larger than that of grains, whereas the capacitances were in the same level. A ferroelectric phase transition was observed to take place at similar to 440 degrees C. The kinetic analysis was performed to study the corresponding relaxation-conduction mechanisms in the material. Above 270 degrees C the conduction behavior of the compound was ascribed to the motion of ionized oxygen vacancies. (C) 2017 Elsevier B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 686-691 |
| Number of pages | 6 |
| Journal | Journal of Alloys and Compounds |
| Volume | 709 |
| DOIs | |
| State | Published - 30 Jun 2017 |
| Externally published | Yes |
Keywords
- Aurivillius compound
- Defects
- Dielectric
- Electrical properties
- Impedance analysis
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