Study of formation mechanism of barium hexaferrite by sintering curve

Improvement of the coercivity of strontium hexaferrite induced by substitution of Al3+ ions for Fe3+ ions

“…The TG curve indicates that the mass of the precursor powder decreases slowly with increasing temperature in the range between room temperature and 400°C, but greatly in a temperature ranging from 600 to 1000°C. The former is due to the release of gases, one of which is produced by combustion of the glycin remained in the precursor powder, and another is vapor absorbed on the surface of the precursor powders, and the later implies that chemical reaction begins to occur and form SrFe 12 O 19 phase near 700°C, similar to the formation temperature of the BaFe 12 O 19 in glycin-nitrate method reported previously [30].…”

“…It can be seen that all samples fabricated at temperatures above 800°C show hysteresis loops of a single phase magnetic material in shape. Based on XRD measurements mentioned above, the samples fabricated above 800°C consist of SrAl x Fe 12Àx O 19 has no effect on the coercivity [30].…”

Influence of chromium substitution on structural and magnetic properties of BaFe12O19 powder prepared by sol–gel auto combustion method

“…Above 950 • C no further indistinguishable weight loss was detected indicating that all organic constituents were eliminated. [29]. The X-ray diffraction pattern for pure BaFe 12 O 19 is in good agreement with JCPDS data (file no.…”

Synthesis, dielectric and magnetic characteristics of poly(1-vinyl-1,2,4-triazole) (PVTri)–barium hexaferrite composite

“…The magnetic properties of barium hexaferrite originate from the Fe 3+ ions of the barium hexaferrite structure [9]. In magnetoplumbite structure, the arrangement of the 12 Fe 3+ ions in the unit cell is as follows: two in the tetrahedral sites (four nearest O 2− neighbors), nine in the dodechedral sites (six nearest O 2− neighbors) and one in the hexagonal site (five nearest O 2− neighbors) [10].…”