This article is cited in 4 papers

Proceedings of the XX All-Russia Conference on Physics of Ferroelectrics (VKS-XX)

Dielectric properties of iron-containing bismuth titanate solid solutions with a layered perovskite structure

M. S. Shashkov^a, O. V. Malyshkina^a, I. V. Piir^b, M. S. Koroleva<sup>b

a</sup> Tver State University
^b Institute of Chemistry of Komi Science Center of Ural Branch of the Russian Academy of Sciences, ul. Pervomayskaya

Abstract: The complex oxides based on bismuth titanate with substituting iron atoms Bi$_4$Ti$_{2.98}$Fe$_{0.02}$O$_{11.99}$, Bi$_4$Ti$_{2.5}$Fe$_{0.5}$O$_{11.75}$, and Bi$_4$Ti$_2$Fe$_1$O$_{11.5}$ have been studied using dielectric spectroscopy in the frequency range from 30 to 10$^6$ Hz at a temperature of 296 K. The frequency dependences of permittivity $\varepsilon$', dielectric loss $\varepsilon$", and complex part of conductivity $\sigma$' have been studied, and the dependences $\varepsilon''(\varepsilon')$ have been constructed. The microstructure images of the studied ceramic materials have been obtained using atomic force microscopy. It has been shown that, as Fe$^{3+}$ ions are introduced as substituting atoms, there is a critical concentration $x$ (0.5 $< x <$ 1) above which the dielectric properties substantially change with variations in the number of perovskite-like layers, and the correlation is observed between the concentration of substituting Fe atoms and the grain size on the surface of the samples.

 English version: Physics of the Solid State, 2015, 57:3, 518–521

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