Article ID Journal Published Year Pages File Type
1607600 Journal of Alloys and Compounds 2015 8 Pages PDF
Abstract

•The (1 − x)BaTiO3 − xBiYO3 (x = 0.2, 0.3) ceramics were prepared by solid state reaction.•The plots of Z″ and M″ are disperated with increase in frequency at different temperatures.•The plots of Z′ and the ac conductivity studies show the NTCR character of the compounds.

The polycrystalline (1 − x)BaTiO3 − xBiYO3 ((1 − x)BT − xBY) (x = 0.2, 0.3) ceramics were prepared by a solid state reaction technique. X-ray diffraction (XRD) analysis shows the information of single phase compound with a perovskite structure. Well grain growth is found in SEM range. The dielectric studies shows that the diffusive factor (γ) is close to 1.8, which confirms that (1 − x)BT − xBY exhibits a diffuse phase transition. Moreover, impedance and electric modulus spectroscopy analysis in the frequency of (20 Hz–2 MHz) within temperature domain (250–400 °C) show that two relaxation processes are involved which are contributed to bulk and grain boundary effects. The plots of Z″ and M″ are dispersed with increase in frequency at different temperatures, which proves the dielectric relaxation. The plots of Z′ and the ac conductivity studies show the NTCR character of the compounds. The experimental value of conduction activation is 0.98 eV, which is near to the conduction activated energy of the electron from second ionization of oxygen vacancies.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
Authors
, , ,