Dielectric and impedance spectroscopy of Sm2CoIrO6 double perovskite
| Autor: | Souvik Chatterjee, Raktim Datta, Subodh Kumar De, Subham Majumdar, Suman Pradhan |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Condensed matter physics Scanning electron microscope Mechanical Engineering Relaxation (NMR) Metals and Alloys 02 engineering and technology Dielectric Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Grain size 0104 chemical sciences Dielectric spectroscopy Mechanics of Materials Materials Chemistry Crystallite 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Journal of Alloys and Compounds. 876:160158 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2021.160158 |
| Popis: | Polycrystalline double perovskite Sm2CoIrO6 (SMCO) ceramics have been prepared by solid state reaction to investigate dielectric properties. X-ray investigation confirms the formation of single phase with monoclinic crystal structure with space group P21/n. Scanning electron microscopy (SEM) reveals the microstructural features with an average grain size of 543 nm. Dielectric, impedance and ac conductivity of the sample were studied in the temperature range 5 – 270 K and frequency range 100 Hz – 2 MHz. Temperature dependent dielectric constant reveals a giant step (~103) which saturates at high temperature ~ 250 K. Distribution of grain size leads to a distribution of dielectric relaxation time which has been described by Cole-Cole relaxation. Coupling of Maxwell-Wagner polarization and polaronic relaxation is evident from the impedance and ac conductivity analysis. |
| Databáze: | OpenAIRE |
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