Preparation of the SrFe12O19-based magnetic composites via boron oxide glass devitrification

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

“…However, despite the wide compositional possibilities, only a few types of magnetic glass-ceramics with silicate or borosilicate glass parent were reported. Most of them are related to magnetite-based glass-ceramics [3][4][5][6][7][8][9][10][11][12] and BaFe 12 O 19 [13][14][15][16][17][18][19][20] but also SrFe 12 O 19 [21][22][23][24][25] and MgFe 2 O 4 [26]. In addition to the oxidic ingredients used for the fabrication of the parent glass, the nature of the nucleating agents seems to be highly relevant to the magnetic properties of the resulting glass-ceramics as well because they facilitate/inhibit the formation of certain phases and impose a specific growth pattern.…”

Synthesis and characterization of SrFe12O19 powder obtained by hydrothermal process

“…The conventional method to obtain this material is a solid state process (calcination of a mixture of ␣-Fe 2 O 3 and SrCO 3 or BaCO 3 at high temperature). Other processes such as mechanical alloying [8], oxide glass heat treatments [9], gas-solid reactions [10], coprecipitation or hydrothermal process [3,11,12] can also be used to synthesise hexaferrite. Recently, Hessien et al [13] have synthesized nanocrystalline SrFe 12 O 19 from natural product (Egyptian celestite ore) as a source of strontium via coprecipitation route.…”

Rapid Formation of a Monolayer of Oriented Hard‐Magnetic Strontium Hexaferrite Nanoparticles on a Solid Substrate

“…1 /2 of the maximum H c values obtained for monodomain hexaferrite materials. [11] M s grows with the particle size, and for solutions B and C approaches values found in bulk hexaferrite. [1] Hydrodynamic diameter of the colloidal particles in colloidal solutions is close to the original strontium hexaferrite particles' diameter, which implies absence of big particle aggregates ( Figure S1).…”

“…A glass with composition 14 SrO · 6 Fe 2 O 3 · 12 B 2 O 3 was prepared as reported in ref. [11,14] and heated with a rate of 5°C min À1 to the annealing temperature T an , held at this temperature for time t, and air quenched. The resulting glass-ceramic samples were treated with acetic acid solution and subsequently with water to dissolve matrix strontium borate phases and to extract the hexaferrite nanoparticles to the colloidal solution by a procedure described in ref.…”