Open AccessRole of Co dopants on the structural, optical and magnetic properties of lead-free ferroelectric Na0.5Bi0.5TiO3 materials
Author(s) -
Đặng Đức Dũng,
N. B. Doan,
Nguyễn Quốc Dũng,
Luong Huu Bac,
Nguyen Hoang Linh,
Le Thi Hai Thanh,
Duong Van Thiet,
Nguyen Ngoc Trung,
Nguyen Cao Khang,
Trinh Van Trung,
Viet Duc Nguyen
Publication year - 2019
Publication title -
journal of science advanced materials and devices
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.898
H-Index - 23
eISSN - 2468-2284
pISSN - 2468-2179
DOI - 10.1016/j.jsamd.2019.08.007
Subject(s) - materials science , diamagnetism , ferromagnetism , dopant , ferroelectricity , doping , band gap , condensed matter physics , ferromagnetic material properties , paramagnetism , magnetic moment , nanotechnology , optoelectronics , magnetization , magnetic field , dielectric , physics , quantum mechanics
Co-doped Na0.5Bi0.5TiO3 materials were fabricated by a sol-gel technique. The structural distortion of Co-doped Na0.5Bi0.5TiO3 materials was due to the difference between the radii of Co dopants and Ti hosts. The optical band gap decreased from 3.11 to 1.83 eV because of the local state of the Co cation in the band structure. Room temperature ferromagnetism emerged as compensation of diamagnetic background and possibly intrinsic ferromagnetic signals. The magnetic moment was determined to be ∼0.64 μB/Co at 5 K. The origin of the room temperature ferromagnetism in the Co-doped Na0.5Bi0.5TiO3 materials was also investigated through the first-principles calculation method. Our study provides physical insights into the complex magnetic nature of transition metal-doped ferroelectric perovskites and contributes to the integration of multifunctional materials into smart electronic devices.
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