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Effect of frequency on the classical and relaxor ferroelectric behavior of substituted titanate Ba0.7Er0.16Ca0.05Ti0.91Sn0.09O3

Authors: Saidi, A; Mabrouki, A; Dhahri, J; Dhahri, E; Khirouni, K; Costa, BFO

Ref.: Phys. Chem. Chem. Phys. 25(7), 17999-18010 (2023)

Abstract: In the present work, we synthesized the perovskite Ba0.70Er0.16Ca0.05Ti0.91Sn0.09O3 compound (BECTSO) by a solid-state reaction and sintering at 1200 & DEG;C. The effects of doping on the structural, electrical, dielectric, and ferroelectric characteristics of the material are examined in this work. X-ray powder diffraction analysis shows that BECTSO crystallizes in a tetragonal structure with space group P4mm. A detailed study of the dielectric relaxation of the BECTSO compound has been reported for the first time. Classical low-frequency ferroelectric and high-frequency relaxor ferroelectric behaviors have been studied. The study of the real part of the permittivity (& epsilon;& PRIME;) as a function of temperature demonstrated a high dielectric constant and identified a phase transition from the ferroelectric phase to the paraelectric phase at T-c = 360 K. The analysis of conductivity curves shows two behaviors: semiconductor behavior for f < 10(6) Hz and metallic behavior for f >10(6) Hz. The relaxation phenomenon is dominated by the short-range motion of the charge carriers. The BECTSO sample could be considered as a potential lead-free material for next-generation non-volatile memory devices and wide-temperature range capacitor applications.

DOI: 10.1039/d3cp01273e