New nanosized Gd–Ho–Sm doped M-type strontium hexaferrite for water treatment application: experimental and theoretical investigations

Abstract

<p>Development of the new nanohexaferrite SrHo_0.01Gd_0.01Sm_0.01Fe_11.97O₁₉ for important applications in industry, which could be very beneficial for applications in magnetic water treatment.</p>

Structural phase stabilization via Ba site doping with bivalent Sr, Ca and Zn ions and Fe site doping with trivalent Cr and Ga ions in the BaFe12O19 hexaferrite and its magnetic modification

“…The unit cell volume, density, and c/a ratio (∼3.94 consistent with magnetoplumbite structure 44,45 ) is mostly guided by inplane lattice parameter 'a'. The density of the material decreased with the sequence of doping Sr, Ca, Zn at Ba sites and the density increased with the sequence of doping Ga, Cr at Fe sites.…”

“…In this process, crystallize size slightly varied (23-27 nm) and it is well consistent with a report on a similar system. 45…”

“…The values of M sat and H C suggest a typical hard ferrimagnetic character with a wide scope of tuning the values by doping at Ba and Fe sites. 1,39,45 The high magnetic coercivity in M-type BaFe 12 O 19 arises from its typical crystal structure with the magnetic easy direction along the c axis and total anisotropy energy (K A ) is related to magnetic anisotropy constants (K 0 , K 1 , and K 2 ) by the relation E A = K 0 + K 1 sin 2 φ and K 2 sin 4 φ, 38,54 where φ is the angle between the magnetization and c axis. The first magnetocrystalline anisotropy constant This journal is © The Royal Society of Chemistry 2022 (K 1 ) dominates over the other anisotropy constants (K 0 and K 2 ) and it is correlated with the anisotropy field (H A ) and M sat by the relation H A = 2K 1 /M sat .…”

Engineering the photocatalytic efficiency of nanoscale TiO2 anatase with doped (Nd/Y) and co-doped (Nd–Y/Nd–Sm) lanthanides to decompose the azo dye orange G under UV-VIS irradiation

“…In our previous work, we highlighted the relationship between the diffusion activation energy and the crystallite size which is well explained by the Arrhenius equation, where with the increasing diffusion activation energy the crystallite size increases. 25,26 Furthermore, in the case of the two co-doped samples, the calculated particle sizes are 7.1 nm and 6.6 nm for Ti 0.99 Nd 0.005 Sm 0.005 O 2 and Ti 0.99 Nd 0.005 Y 0.005 O 2 respectively. The replacement of half the percentage of Nd in Ti 0.99 Nd 0.01 O 2 by Sm 3+ or Y 3+ reveals a decrement in the average particle size in the order of Nd1% 4 Nd-Sm 4Nd-Y.…”

Changes in the Structure, Magnetization, and Resistivity of BaFe12–xTixO19

“…Nowadays, the transition-metal oxides are very relevant to research in condensed matter. − These compounds for the base of preparation of perspective dielectrics, ferroelectrics, semiconductors, superconductors, magnets, thermoelectrics, multiferroics, and even materials for water treatment. , The main advantages of these compounds are explained by complex cooperation of the lattice, spin, and charge subsystems of transition metals. The expansion of the functionality of these compounds is associated with a change in their chemical compositions and structural parameters.…”