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Structural, dielectric, and conductivity studies of strontium-doped Gd2NiMnO6 perovskite Nazima Nazir1,* 1

and Mohd Ikram1

Solid State Research Laboratory, Department of Physics, National Institute of Technology, Srinagar, J&K 190006, India

Received: 23 May 2020

ABSTRACT

Accepted: 3 November 2020

In this contribution, the structural, electrical, dielectric, and microstructural properties of double perovskite Gd2NiMnO6 doped with strontium were presented. The strontium-doped double perovskite Gd2–xSrxNiMnO6 (x = 0, 0.1 & 0.3) was synthesized by using the solid-state reaction method. The X-ray diffraction and scanning electron microscopy characterization techniques were used to investigate the structural and surface morphological properties. The Rietveld refinement depicted the formation of pure phase having a P21/n monoclinic space group. A decrease in grain size and crystallite size was found with the dopant concentration increase, resulted in enhancement of dielectric constant of the material. The frequency- and temperature-dependent dielectric study revealed increase in dielectric constant and decrease in dielectric loss with the increase in dopant concentration. Apart from dielectric studies, the conductivity studies revealed decrease in conductivity with the increase in Sr doping, supporting the dielectric properties. In conclusion, the synthesized material is functional, has high dielectric constant, low dielectric losses and low conductivity, and, hence, it can be considered as a potential candidate for high k dielectric materials.

Ó

Springer Science+Business

Media, LLC, part of Springer Nature 2020

1 Introduction Ceramics are believed to be one of the largest and highly versatile materials. However, only few ceramic materials are used by humans not only in terms of weight and volume, but also in terms of scientific and technological purposes. All the phases of these ceramics defined by the structure and composition are important because they possess so many exotic properties. Amidst all of these, the structures of A2BX4 spinel and ABO3 perovskite stand out by

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https://doi.org/10.1007/s10854-020-04827-0

significant margin. Among these, the perovskite structure is ahead of all, because this single structure can generate a variety of phases with a simple modification which can be done in many ways like doping, etc. and thus possess a variety of functions [1]. Due to the remarkable material stability, perovskites and their derivatives have recently been explored as a category of materials having a variety of applications in the fields of electrolysis, photovoltaics, optoelectronics, and photocatalysis, thus, showing a great promise in terms of catalytic activity and stability of

J Mater Sci: Mater Electron

devices [2–9].The complex oxides of the perovskiterelated structure are of immense importance, because they have extraordinary applications like colossal magneto-resistance, large magneto-capacitance, magneto-electric data storage, mult