Abstract
The reasons for the high electrical conductivity of bismuth ferrite due to its natural composite structure, structural non-stoichiometry, redox processes, and the boundary position in the perovskite family have been considered. It has been shown that it is possible to significantly (2–3 orders of magnitude) reduce the conductivity of BiFeO3 by introducing large-sized ions of rare-earth elements (REE: La, Pr, Nd, Sm, Eu, Gd with 0.94 ≤ R¯ ≤ 1.04 Å) in amounts of up to 10 mol %. An interpretation of the observed effects has been given. A consideration about the appropriateness of taking into account the presented results when developing devices using materials of the BiFeO3/REE type has been expressed.
Highlights
Accepted: 20 January 2021Features of modern technology: intensification of processes associated with an increase in operating temperatures, pressures, frequencies; acceleration of energy transformations; and the pursuit of multifunctionality of high-tech products all determine tougher technical, economic and environmental requirements demanded for the material and technological base used in industry
Based on the results obtained we proposed the methods for optimizing the technology of obtaining materials involving BiFeO3
We examine in greater detail the reasons for the increased conductivity of BiFeO3 and the possibility of minimizing it by variations in the cationic composition upon modification of this multiferroic with rare-earth elements (REE)
Summary
Features of modern technology: intensification of processes associated with an increase in operating temperatures, pressures, frequencies; acceleration of energy transformations; and the pursuit of multifunctionality of high-tech products all determine tougher technical, economic and environmental requirements demanded for the material and technological base used in industry. In this regard, multiferroic media with coexisting special electrical and magnetic properties are of increasing scientific and practical interest. We examine in greater detail the reasons for the increased conductivity of BiFeO3 and the possibility of minimizing it by variations in the cationic composition upon modification of this multiferroic with rare-earth elements (REE)
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