Controlling the Oxygen Defects Concentration in a Pure BiFeO3 Bulk Ceramic

Journal article (2022)

Authors

A. Tuluk Novel Aerospace Materials - Aerospace Engineering
J.C. Brouwer Team Marcel Hermans - Mechanical, Maritime and Materials Engineering
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
Copyright: © 2022 A. Tuluk, J.C. Brouwer, S. van der Zwaag
DOI: https://doi.org/10.3390/ma15196509
More Info
expand_more

Published Date

2022

Language

English

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract

BiFeO
3 is a multiferroic material with a perovskite structure that has a lot of potential for use in sensors and transducers. However, obtaining pure single-phase BiFeO
3 ceramic with a low electrical conductivity via solid-state reactions remains a problem that limits its application. In this work, the suppression of secondary phases in BiFeO
3 was studied by varying the compositional parameters and the sintering temperature. The addition of 1% Bi
2O
3 to the stoichiometric precursor mixture prevented the formation of secondary phases observed when sintering stoichiometric precursors. The pure phase ceramic had a p-type conductivity and a three-decade lower electrical conductivity as measured by impedance spectroscopy. Annealing of optimally synthesized material at different partial pressures of oxygen in an oxygen–nitrogen gas atmosphere showed that the reason for this type of conductivity lies in the high concentration of defects associated with oxygen. By annealing in various mixtures of nitrogen and oxygen, it is possible to control the concentration of these defects and hence the conductivity, which can go down another two decades. At a pO
2  (Formula presented.) the conductivity is determined by intrinsic charge carriers in the material itself.