Structure and dielectric studies of (1-x)Ba0.06(Na0.5Bi0.5)0.94TiO3- xBa(Fe0.5Nb0.5)O3 lead-free ceramics

Abstract

In this work, the effects of Ba(Fe 0.5 Nb 0.5 )O 3 (BFN) addition on the structure and dielectric behaviour of Ba 0.06 (Na 0.5 Bi 0.5 ) 0.94 TiO 3 (BNBT) ceramics have been reported. The lead-free (1-x)BNBT-xBFN (where 0 ≤ x ≤ 1.0) solid-solutions were synthesized by traditional ceramics fabrication technique and sintered at temperatures up to 1325°C. The X-ray diffraction peaks of the compounds of the entire series were indexed. It is found that the crystal structure of the obtained solid solutions changed from rhombohedral (R3c) to cubic (Pm3m) with an increase in BFN content. The Fourier transformed infrared and Raman spectra also confirmed the formation of solid-solutions. SEM studies were carried out to evaluate the purity and microstructure of the fabricated ceramics. The dependence of phase transition broadening, phase transition temperature and dielectric parameters with compositional changes were also studied.

Impedance Spectroscopy Analysis of (1-<i>x</i>)Ba_0.06(Na_1/2Bi_1/2)_0.94TiO₃-<i>x</i>NaTaO₃ Ceramics

“…According to the available literature, the Bi-based perovskite Ba0.06(Na1/2Bi1/2)0.94TiO3, referred to as BNBT, has emerged as a promising candidate for commercial applications as a lead-free piezoelectric ceramic. This particular material is known to exhibit exceptional piezoelectric and electromagnetic properties, particularly when operated near the morphotropic phase boundary (MPB) [8][9][10][11]. Sodium Tantalate (NaTaO3) (abbreviated hereafter as NT) is a perovskite-type dielectric material that possesses an orthorhombically distorted perovskite structure belonging to the Pbnm space group [12].…”

Structure, Microstructure, and Dielectric Properties of Bi_0.5(Na_0.78K_0.22)_0.5TiO₃Lead-Free Ceramic

“…PZT {Pb(ZrxTi1-x)O3} has monopolized the commercial market for electro-ceramic-based devices, due to its marvellous piezoelectric, electromechanical, and dielectric properties near the morphotropic phase boundary [1]. However, the toxic effect of lead on the environment and humans has forced the research community to probe and synthesize lead-free ceramics which could replace the PZT (Lead Zirconate Titanate) [2][3][4][5][6].…”