LiFe5O8 and BaFe12O19 Fine Particles Crystallised in a Glassy Matrix

Abstract

glass strips (with dimensions 50 mm long, 6 mm wide and about 30÷100 µm thick) subjected to various heat treatments. The irreversible structure changes produced by heat treatments, were investigated by X-ray diffraction and magnetic measurements. The magnetic behaviour is discussed in terms of the evolution of the size of LiFe 5 O 8 and BaFe 12 O 19 crystals dispersed in the glassy matrix, with thermal annealing.

Preparation and properties of barium ferrite microcrystal in B2O3–Bi2O3 glass

“…From the microstructural observation, the magnetic particles had a size distribution about 500 nm. According to the literature [12], the barium ferrite particles with the size lower than 460 nm were single domain particles and caused low magnetic interaction. In our study, some ferrite crystals were larger than the size of a single domain particle.…”

Terahertz Radiation by Subpicosecond Magnetization Modulation in the Ferrimagnet LiFe5O8

“…Six-coordinated and four-coordinated Fe 3+ ions in the high-spin state (S = 5/2) are ordered antiparallel with a 3:2 ratio, 19 resulting in ferrimagnetism at room temperature. The magnetic easy axis is the [111]-direction of the crystal, and the ferrimagnetic transition temperature is 928 K. 20 Left and right panels of Figure 1b show the schematics of the energy level diagrams of six-coordinated and four-coordinated Fe 3+ respectively; 3d-orbitals split into doubly degenerate e g (e) orbitals and triply degenerate t 2g (t 2 ) orbitals by the octahedral (tetrahedral) crystal fields.…”