The structural, magnetic, and electrochemical properties of La+3 substituted, barium hexaferrite (BaLaxFe12-xO19) synthesized by mechanical milling

A series of M-type barium hexaferrite with chemical composition BaLa_xFe_12-xO₁₉ (x=0, 0.2, 0.5,) were synthesized by mechanical milling and sintered at 1100&deg;C for 2h. The structural properties have been investigated through an X-pert high score and the retrieved pattern revealed the formation of a single-phase magnetoplumbite structure. The diamond software also confirms the magnetoplumbite structure along with its Wyckoff positions. Each hexaferrite sample contains 60 atoms and they have been dispersed in 11 different symmetry sites also known as Wyckoff sites. Whereas the Fe⁺³ atoms are allocated in main five crystallographic sites such as 12 k, 2a, 2b, 4f1, and 4f2, respectively. The SEM images confirm the hexagonal shape of the particles. The magnetic properties reveal the clear ferromagnetic M-H curve in which the value of coercivity, saturation magnetization and remanence magnetization increases with La⁺³ content. The change in the value of <i><strong>Hc</strong></i> is due of substitution which change uniaxial anisotropy constant at the 4f₂ and 2b sites The electrochemical performance of the pseudocapacitor La⁺³ substituted BaHF was studied by cyclic voltammetry. It was found that by increasing concentration the specific capacitance also increased monotonically from 621 to 984 F. g -1. It is also confirmed from past work, the utilization of low scan rates is responsible for higher Csp values due to their longer time, deep penetration in pores.