Investigation of Complex Impedance and Modulus Properties of Nd Doped 0.5BiFeO3-0.5PbTiO3 Multiferroic Composites

TL;DR

This study investigates the electrical impedance and modulus properties of Nd-doped 0.5BiFeO3-0.5PbTiO3 multiferroic composites, revealing bulk effects, non-Debye relaxation, and hopping conduction mechanisms influenced by Nd concentration.

Contribution

It provides new insights into the impedance, relaxation behavior, and conduction mechanisms of Nd-doped multiferroic composites synthesized via solid state reaction.

Findings

Bulk resistance decreases with temperature and Nd doping.

Presence of non-Debye relaxation behavior.

Hopping conduction mechanism confirmed.

Abstract

0.5BiNdxFe1-xO3-0.5PbTiO3 (x=0.05, 0.10, 0.15, 0.20) composites were successfully synthesized by a solid state reaction technique. At room temperature X-ray diffraction shows tetragonal structure for all concentrations of Nd doped 0.5BiFeO3-0.5PbTiO3 composites. The nature of Nyquist plot confirms the presence of bulk effects only for all compositions of Nd-doped 0.5BiFeO3-0.5PbTiO3 composites. The bulk resistance is found to decreases with the increasing in temperature as well as Nd concentration and exhibits a typical negative temperature coefficient of resistance (NTCR) behavior. Both the complex impedance and modulus studies have suggested the presence of non-Debye type of relaxation in the materials. Conductivity spectra reveal the presence of hopping mechanism in the electrical transport process of the materials. The activation energy of the composite increases with increasing Nd concentration and were found to be 0.28, 0.27, 0.31 and 0.32eV for x=0.05, 0.10, 0.15, 0.20 respectively at 200-275 oC for conduction process.