Abstract
The complex perovskite oxide a strontium gadolinium niobate (SGN) synthesized by solid-state reaction technique has single phase with tetragonal structure. X-ray diffraction (XRD) technique and scanning electron microscopy (SEM) were used to study the structural and microstructural properties of the ceramics, respectively. The XRD patterns of SGN at room temperature show a tetragonal structure. Studies of the dielectric constant and dielectric loss of compound as a function of frequency (50 Hz to 1 MHz) at room temperature, and as a function of temperature (60°C to 420°C) indicate polydispersive nature of the material. The logarithmic angular frequency dependence of the loss peak is found to obey the Arrhenius law with activation energy ~0.18 eV. The small value of activation energy of the compound (~0.18 eV) can be explained by mixed ionic-polaronic conductivity mechanism. The grain size of the pellet sample was found to be 1.92 μm. The frequency-dependant electrical data are analyzed in the framework of conductivity and electric modulus formalisms. The complex plane impedance plot shows the grain boundary contribution for higher value of dielectric constant in the law frequency region.
Highlights
The family of compounds with general formula ABO3 is generally called perovskite oxides, as their structural is similar to the naturally obtained CaTiO3
Complete information on correlation of sample topology with its electrical properties can be obtained by the complex impedance spectroscopy (CIS) technique [10,11,12,13]
In this paper we investigate the structural and dielectric relaxation properties of the strontium gadolinium niobate, Sr(Gd0.5Nb0.5)O3, (SGN) ceramics in the temperature range from 60 ̊C to 420 ̊C and in the frequency 50 Hz to 1 MHz by means of dielectric spectroscopy
Summary
The family of compounds with general formula ABO3 is generally called perovskite oxides, as their structural is similar to the naturally obtained CaTiO3 The study on this compounds is important as they find several applications in non-linear optics, memory devices, pyroelectric, piezoelectric sensors etc. Complete information on correlation of sample topology with its electrical properties can be obtained by the complex impedance spectroscopy (CIS) technique [10,11,12,13]. This technique is used to investigate the electrical process occurring in the material on applying ac signal at the input. In this paper we investigate the structural and dielectric relaxation properties of the strontium gadolinium niobate, Sr(Gd0.5Nb0.5)O3, (SGN) ceramics in the temperature range from 60 ̊C to 420 ̊C and in the frequency 50 Hz to 1 MHz by means of dielectric spectroscopy
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