Results
Title

Effect of Ba<sup>2 </sup> ion on the structural, morphological and electrical properties of lead-free Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> ceramics.

Authors

Mohanty, Hari Sankar; Jena, Mousumi; Jena, Kalyani; Dey, Tushar; Nayak, Rakesh Kumar; Kata, Tularam; Panda, Pratyush; Sahu, Manoj Kumar; Borkar, Hitesh; Mohapatra, S. R.; Tripathy, Nilakantha

Abstract

Lead-free solid solution (1 − x) Na0.5Bi0.5TiO3–x BaTiO3, for x = 0.12 was successfully synthesized via sol–gel self-ignition wet chemical method. Choice of suitable dopants at proper sites (A and/or B) of a perovskite structure (ABO3 type) can modify the functional properties of the system. Here, we have systematically investigated the structural, micro-structural, vibrational, ferroelectric, dielectric phase transition and electrical properties of barium modified Na0.5Bi0.5TiO3 compound. Room temperature structural analysis (Rietveld and Raman spectroscopy) evident the formation of perovskite monophasic tetragonal phase. First-principles calculation based on density functional theory is in corroboration with the rietveld refined XRD results. The polydispersive nature of sample was confirmed from SEM imaging. The T-dependent dielectric spectra show diffused phase transition (Ferroelectric–Paraelectric) at a Curie temperature 255 °C. A well-defined real ferroelectric saturated hysteresis behaviour has been established upon E-poling the ceramics. From different types of conduction mechanism, bulk-limited space-charge conduction has been confirmed from J–E curve. Detailed electrical property studies on impedance spectroscopy and ac conductivity within the frequency range100 Hz–1 MHz have been investigated systematically on the polycrystalline sample in a broad thermal interval of 300–773 K. The assessed band gap value of ~ 3 eV in NBT-based ceramics recommend their use in power electronic devices.

Subjects

LEAD-free ceramics; PHASE transitions; CURIE temperature; SPACE charge; ELECTRONIC equipment; DENSITY functional theory

Publication

Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 18, p15232

ISSN

0957-4522

Publication type

Academic Journal

DOI

10.1007/s10854-022-08442-z