Effect of la on the structure and characteristics of multiferroic BiFeO3

Dao Son Lam; Dinh Chi Linh; Ta Ngoc Bach; Dang Duc Dung; Ngo Thu Huong; Tran Dang Thanh

doi:10.15625/2525-2518/16385

Author affiliations

Authors

Dao Son Lam Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Dinh Chi Linh Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Ta Ngoc Bach Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Dang Duc Dung School of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet, Ha Ba Trung, Ha Noi, Viet Nam
Ngo Thu Huong Ha Noi University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi, Viet Nam
Tran Dang Thanh Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/16385

Keywords:

Multiferroic, magnetic property, ferroelectric property, optical property

Abstract

Bi_1-xLa_xFeO₃ (x = 0, 0.1, 0.2, 0.3) ceramics with a particle size of about 100 nm were prepared by high energy ball milling method and annealed at 800 ^oC in air for 6 h. Effects of La substitution on the structural, magnetic, ferroelectric, and optical properties of BiFeO₃ were examined in detail and systematically. The results indicate that partial replacement of Bi³⁺ by La³⁺ contributes to the formation of hexagonal single phase. Due to the increase of La³⁺ ion content, the values of the remnant polarization (P_r) and the coercive field (E_c) are improved, the maximum values achieved is about 0.0036 µC/cm² and 0.57 kV/cm, respectively, for sample x = 0.2. For increasing La doped content in BiFeO₃, the value of coercivity magnetic field (H_c) tends to decrease gradually. The optical property of Bi_1-xLa_xFeO₃ ceramics was studied by analyzing their UV-vis absorption spectra. The value of band gap energy (E_g) of materials decreases from 1.86 to 1.78 eV, corresponding to x = 0 - 0.2, and the broad absorption band in the wavelength range of 660-700 nm. The observed characteristics of La-doped BiFeO₃ may be helpful for the further search for high-performance lead-free multiferroic magnetoelectric materials, oriented toward applications in solar cells, optoelectronic devices, or in the environmental pollution treatment technology field by the photocatalytic reaction.

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