Ferroelectricity

Crystal structure, microstructure, piezoelectric and dielectric properties of high-temperature piezoceramics Bi$_{3-x}$Nd$_x$Ti$_{1.5}$W$_{0.5}$O$_9$ ($x$ = 0, 0.1, 0.2)

S. V. Zubkov^a, I. A. Parinov^b, A. V. Nazarenko^bc, Yu. A. Kuprina<sup>a

a</sup> Research Institute of Physics, Southern Federal University
^b Institute of Mathematics, Mechanics and Computer Sciences, Southern Federal University, Rostov-on-Don, Russia
^c Southern Research Center of the Russian Academy of Sciences, Rostov-on-Don, Russia

Abstract: A new series of perovskite-like oxides Bi$_{3-x}$Nd$_x$Ti$_{1.5}$W$_{0.5}$O$_9$ ($x$ = 0, 0.1, 0.2) has been synthesized by the method of high-temperature solid-state reaction. The X-ray diffraction study showed that the compounds are single-phase and have the structure of the family of Aurivillius phases with parameters close to the orthorhombic unit cell corresponding to the space group $A2_1am$. The relative permittivity $\varepsilon/\varepsilon_0$ and loss angle tangent $\operatorname{tg}\sigma$ are measured as functions of temperature at different frequencies. The piezoelectric modulus $d_{33}$ was measured for the synthesized compounds. The microstructure of Bi$_{3-x}$Nd$_x$Ti$_{1.5}$W$_{0.5}$O$_9$ ($x$ = 0, 0.1, 0.2) was obtained. The study of the microstructure shows that the crystallites have a shape characteristic of Aurivillius phases.

Keywords: Aurivillius phases, Bi$_{3-x}$Nd$_x$Ti$_{1.5}$W$_{0.5}$O$_9$, activation energy $E_a$, Curie temperature $T_C$.

Received: 10.04.2022
Revised: 10.04.2022
Accepted: 11.04.2022

DOI: 10.21883/FTT.2022.10.53093.341

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