Dielectric and impedance spectroscopy of Sm2CoIrO6 double perovskite

被引：14

作者：

Datta, Raktim ^{[1
]}

Pradhan, Suman Kalyan ^{[2
]}

Chatterjee, Souvik ^{[3
]}

Majumdar, Subham ^{[1
]}

De, Subodh Kumar ^{[2
]}

机构：

[1] Indian Assoc Cultivat Sci, Sch Phys Sci, Kolkata 700032, India

[2] Indian Assoc Cultivat Sci, Sch Mat Sci, Kolkata 700032, India

[3] UGC DAE Consortium Sci Res, Kolkata Ctr, Sect III,LB 8, Kolkata 700106, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 876卷 / 876期

关键词：

Double perovskite; Solid state reaction; Dielectric; Impedance; Ac conductivity; CONDUCTION MECHANISM; MAGNETORESISTANCE; RELAXATION; MODULUS; MODEL;

D O I：

10.1016/j.jallcom.2021.160158

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页数：7

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