Sub-switching domain effect for analysis the non-linear dielectric behavior of (K0.49 Na0.49Li0.02) (Nb0.98Sb0.02)O3 ceramic based on Rayleigh model

Atito, Ibrahim A.; Shaban, H. T.; Salem, A.; Ezzeldien, Mohammed; Mahmoud, Abd El-razek; Atito, Ibrahim A.; Shaban, H. T.; Salem, A.; Ezzeldien, Mohammed; Mahmoud, Abd El-razek

doi:2022.59.5.705

J. Korean Ceram. Soc. > Volume 59(5); 2022 > Article

Original Article

Journal of the Korean Ceramic Society 2022;59(5): 705-714.
doi: https://doi.org/10.1007/s43207-022-00218-9

Sub-switching domain effect for analysis the non-linear dielectric behavior of (K_0.49 Na_0.49Li_0.02) (Nb_0.98Sb_0.02)O₃ ceramic based on Rayleigh model

Ibrahim A. Atito¹, H. T. Shaban², A. Salem², Mohammed Ezzeldien³, Abd El-razek Mahmoud¹

¹Piezoelectric and Ferroelectric Measurements Lab, Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt
²Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt
³Metallurgy and Material Science Test (MMST) Lab, Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt

Correspondence

Ibrahim A. Atito ,Email: ibrahim94@sci.svu.edu.eg
Abd El-razek Mahmoud ,Email: abdelrazek.mahmoud@sci.svu.edu.eg

Received: March 22, 2022; Revised: May 3, 2022 Accepted: May 31, 2022. Published online: June 23, 2022.

ABSTRACT

The solid-state sintering technique has been implemented to synthesize (K_0.5Na_0.5NbO₃)-0.02(LiSbO₃) (KNN-LS) Pb-free ceramic. The crystal structure, dielectric and ferroelectric properties of the prepared material were investigated. Pure orthorhombic perovskite phase [I₍₂₂₀₎/I₍₀₀₂₎ = 1.68] with Amm2 space group has been detected at room temperature for sintered ceramic. Two anomalous permittivity peaks corresponding to orthorhombic–tetragonal (O–T) phase transition at T = 175 °C and tetragonal–cubic (T–C) phase transition at T = 355 °C have been observed. At polymorphic phase transition, the Rayleigh model shown the extrinsic contributions caused by domain wall motion is about 80%, while the intrinsic contribution attributed to the lattice distortion is about 20%. Ferroelectric properties were investigated in a wide range of temperatures (RT-225)°C. The results shown a conductive material at high temperature due to the higher cation disorder and leakage current above PPT. The present results are interested for understanding the mechanism of t permittivity–temperature behavior of KNN-doped LS ions based on Rayleigh model. The large remnant polarization and low coercive field below PPT make the material a suitable candidate for energy storage application.

Key words: Lead-free ceramics · Polymorphic phase transition · Rayleigh analysis · Leakage current