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Dielectric Properties in Transition Metal and Rare‐Earth‐Doped Multiferroic BaTiO 3 Nanoparticles
Author(s) -
Apostolov Angel T.,
Apostolova Ilia.,
Wesselinowa Julia M.
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000046
Subject(s) - materials science , multiferroics , dielectric , doping , ferroelectricity , ion , nanoparticle , phase transition , condensed matter physics , particle size , phase (matter) , transition temperature , analytical chemistry (journal) , nanotechnology , chemistry , optoelectronics , superconductivity , physics , organic chemistry , chromatography
The temperature, doping concentration, size, and magnetic field dependences of the real part of the dielectric function ϵ ′ for Fe and Er ion‐doped BaTiO 3 bulk and nanoparticles—are calculated using microscopic models and the Green's function technique. The Fe ions substitute the Ti ions and cause a tensile strain. The maximum value of ϵ ′ and the ferroelectric phase transition temperature T C decrease with increasing the Fe doping concentration. Moreover, ϵ ′ decreases with decreasing particle size and increases with increasing an external magnetic field. The latter is an evidence for a strong magnetodielectric effect. By substituting the Ba with Er ions, there appears a strong compressive strain. It causes an increase in the maximum of ϵ ′ and T C with increasing the Er ion concentration.