Structural Investigations and Magnetic Properties of BaFe₁₂O₁₉Crystals

Abstract

This work was dedicated to the preparation of a barium hexaferrite using the glass crystallization method. The glass flakes were treated at temperatures ranging between 550• C and 750• C. The investigation carried out by X-ray diffraction revealed the phase composition and the mean crystallite size. By means of the scanning electron microscopy, the crystallite shape and average size were established. The electric and magnetic properties were investigated at room temperature by means of a Solartron 1260A impedance/gain phase analyzer and a vibrating sample magnetometer. The optimum heat treatment was established to obtain the maximum coercivity of the barium hexaferrite.

Magnetic and Structural Properties of Barium Hexaferrite BaFe12O19 from Various Growth Techniques

“…Current developments include the synthesis of barium and strontium hexaferrites in carbon monoxide reductive gas followed by recalcination [22], or from glass crystallization using a mixture of antimony and boron oxides [23]. An important task is to find a solvent or flux capable of both lowering the melting point, and ensuring the crystallization of barium hexaferrite phases.…”

Magnetic cotton yarns – optimization of magnetic properties

“…The izotropic barium hexaferrite (BaFe 12 O 19 ) -BF is a ferrimagnetic material, obtained from iron oxide (Fe 2 O 3 ) and barium carbonate (BaCO 3 ) having the following estimated magnetic characteristics at room temperatures: saturation magnetization (M s ) of approximately 54 emu/g, residual magnetization (M r ) of about 31 emu/g, and coercive field (H c ) of about 100 kA/m at a maximum applied magnetic field of 600 kA/m (Tudorache, Popa, Brinza, & Tascu, 2012). The Curie temperature (T c ) of barium ferrite does not exceed 450°C.…”

EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

“…The problem faced in a ferrite-based magnetic material that will be the object of this study is the magnetocrystalline anisotropy constant of this compound has relatively high value of ~ 330 kJ/m 3 . This value is very high and causes the material has relatively large coercivity about ~ 1500 kA.m -1 which is needed as a permanent magnet [11][12][13][14][15]. However, as an absorber material of electromagnetic waves (microwave absorber) must have a coercivity value as low as possible so that the magnetic loss is low, but should still have a high value of the total magnetization.…”