Formation and properties of BaxFe3−xO4 with spinel structure by mechanochemical reaction of α-Fe2O3 and BaCO3

Study of formation mechanism of barium hexaferrite by sintering curve

“…1(b) shows the XRD diffraction pattern of the mixture milled for 80 h, indicating that the diffraction peaks of the BaCO 3 disappear completely and the peaks of the ␣-Fe 2 O 3 almost disappear, while some strong diffraction peaks belonging to the Ba x Fe 3−x O 4 with spinel structure is observed. That implies that some ␣-Fe 2 O 3 react with BaCO 3 to form Ba x Fe 3−x O 4 with spinel structure, in agreement with the results reported by He et al [24]. The 80 h-milled mixture consists of the Ba x Fe 3−x O 4 and a small amount of ␣-Fe 2 O 3 .…”

Application of mechanochemical synthesis of advanced materials

“…13a reveal the formation of HAp in reaction (5). The XRD patterns confirmed that the product is HAp as expected besides impurity of CaHPO 4 .…”

“…Mechanochemical process is a simple, environmental, low-cost technology. Interests in this field tend to rise continuously, and the number of related papers increases annually [4][5][6]. Even though the mechanisms of mechanochemical process are not completely clear.…”

Preparation and magnetic properties of barium ferrites substituted with manganese, cobalt, and tin

“…This novel approach has made the formation of S block in barium ferrite easier in the self-assembly reaction using conditions that are also favorable for the formation of cubic iron oxides, stuffed tridymite orthorhombic monoferrite BaFe 2 O 4 , or spinel BaFe 2 O 4 [11], since the coupling reduced the reaction temperature by converting the solid diffusion reaction in the co-precipitation reaction to a molten solvent reaction. The reduced temperature suppresses the formation of a-Fe 2 O 3 and favors the formation of cubic ferric oxides, and hence should also encourage the formation of the S block in barium ferrite in the self-assembly reaction.…”