Spray pyrolysis synthesis, electrical and magnetic properties of HoxBi1-xFeO3 nanocrystals

• Published in: Journal of materials science. Materials in electronics 2022-11, Vol.33 (32), p.24594-24605
• Main Authors: Tomina, E. V., Kurkin, N. A., Korol’, A. K., Alekhina, Yu. A., Perov, N. S., Jiyu, Fan, Mittova, I. Ya, Nguyen, Tien A., Bui, Vuong X.
• Format: Article
• Language: English
• Subjects: Aerosols; Bismuth; Bismuth ferrite; Characterization and Evaluation of Materials; Chemical synthesis; Chemistry and Materials Science; Coercivity; Dielectric strength; Frequency ranges; Holmium; Lattice parameters; Magnetic fields; Magnetic properties; Magnetization; Materials Science; Memory devices; Nanocrystals; Nitrates; Optical and Electronic Materials; Particle size; Reagents; Spray pyrolysis; Temperature dependence; Unit cell
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-022-09170-0

Bismuth ferrite nanopowders doped with holmium ions were synthesized by spray pyrolysis. By means of the TEM and SEM methods, it was established that Ho x Bi 1- x FeO 3 particles have dimensions in the range of 50–170 nm and are agglomerated into spherical formations with a size of 1.5–3 μm. A decrease in the lattice parameters and unit cell volume of holmium-doped bismuth ferrite samples was shown, and the EDX data confirm the incorporation of holmium ions into the positions of bismuth ions in the BiFeO 3 lattice. Doping of bismuth ferrite with holmium ions led to a significant increase in the saturation magnetisation and residual magnetisation in comparison with undoped BiFeO 3 , while the coercive force decreased. Magnetic characteristics of Ho x Bi 1- x FeO 3 samples demonstrated strong dependence on temperature, and the dielectric permittivity in the frequency range up to 200 kHz remains practically unchanged. Magnetocapacitance values in fields up to 5 × 10 5 A/m did not exceed a tenth of a percent, which is associated with a high dispersion of nanopowders. The values of M s and M r obtained for Ho x Bi 1- x FeO 3 open up prospects for using this material for the development of magnetic field sensors, memory cells, and spintronic devices.