Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 876, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160158
Keywords
Double perovskite; Solid state reaction; Dielectric; Impedance; Ac conductivity
Categories
Funding
- Science and Engineering Research Board (SERB), Government of India [EMR/2016/005437]
- SERB
- IACS
- Department of Science and Technology, Government of India [IF150147]
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Polycrystalline double perovskite Sm2CoIrO6 ceramics were prepared and studied for their dielectric properties, showing a monoclinic crystal structure with an average grain size of 543 nm. The temperature-dependent dielectric constant exhibited a giant step and saturation at high temperature. The distribution of grain size led to a distribution of dielectric relaxation time.
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 P2(1)/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 (similar to 10(3)) which saturates at high temperature similar to 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. (C) 2021 Elsevier B.V. All rights reserved.
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