Magnetism, spintronics

Crystal structure and piezoelectric and dielectric properties of a new series of solid solutions SrBi$_2$Nb$_{2-x}$Ta$_x$O$_9$ ($x$ = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0)

S. V. Zubkov, Yu. A. Kuprina

Research Institute of Physics, Southern Federal University

Abstract: Aurivillius-Smolensky (AS) ceramics SrBi$_2$Nb$_{2-x}$Ta$_x$O$_9$ ($x$ = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0), number of perovskite-like layers $n$ = 2 were synthesized (for $x$ = 0.2, 0.4, 0.6, 0.8, 1.0) by traditional solid-phase reaction. According to X-ray powder diffraction data, it was found that all compounds are single-phase with the structure of AS phases (number of perovskite-like layers $m$ = 2) with an orthorhombic crystal lattice (space group A2$_1$am). The crystal lattice parameters $a$, $b$, and $c$ were calculated, relative dielectric constant $\varepsilon/\varepsilon_0(T)$, dielectric loss tangent $\operatorname{tg}\delta$, Curie temperature $T_{\mathrm{C}}$, and piezoelectric modulus $d_{33}$ were measured.

Keywords: Aurivillius–Smolensky phases, Curie temperature, microstructure, dielectric constant, piezoelectric modulus.

Received: 22.10.2025
Revised: 22.10.2025
Accepted: 24.10.2025

DOI: 10.61011/FTT.2025.10.61971.290-25

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