Phase formation and electrical properties of SBNLT ceramics prepared via combustion technique

Abstract

This report investigates the effect of firing temperatures on the phase formation, microstructure, electrical, and energy storage properties of lead-free Sr_0.3(Bi_0.7Na_0.67Li_0.03)_0.5TiO₃ (SBNLT) ceramics, synthesised by combustion technique. The samples were calcined between 700°C and 900°C for 2 h and sintered between 1100°C and 1200°C for 2 h. The ceramics exhibited coexisting rhombohedral and tetragonal phases, which were confirmed by the Rietveld refinement technique. A morphotropic phase boundary (MPB) of the rhombohedral and tetragonal phases, with a ratio of 49:51, was obtained at the sintering temperature of 1175°C. The highest maximum dielectric constant (ε_max= 4667), polarisation (P_max= 28.80 µC/cm²) and energy density (W = 0.95 J/cm³), with a breakdown strength of 70 kV/cm, were achieved from the sample sintered at 1175°C.

KEYWORDS:

• SBNLT
• solid-state combustion
• dielectric
• ferroelectric

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Naresuan University (NU) and National Science, Research and Innovation Fund (NSRF) with grant number R2566B038. The authors thank the Department of Physics, Faculty of Science, Naresuan University for their supporting facilities. Dr. Kyle V. Lopin is also thanked for his assistance in editing the manuscript.