Magnetic Properties of Ba-Zn-System W-Type Hexagonal Ferrite Magnets.

Properties of anisotropic Ba-Zn-Cu system W-type hexagonal ferrite magnets

“…6 O 27 , to calculate its magnetic moment K B per molecule, the value of K B = 33.3 P B can be obtained. This value is somewhat lower than the value of K B = 33.7 P B reported earlier [19]. Figure 7 shows the effect of the amount of BaO added to the BaZn 1.7 Cu 0.3 Fe 16 O 27 compound on its Curie temperature.…”

“…Such addition has been reported to be effective for improving magnetic properties [19]. As seen, at 1 wt% BaO addition a peak appears on the pattern, which corresponds to the M phase and overlays with corresponding peak for the W phase.…”

“…Figure 1 presents magnetic characteristics of the BaZn 2x Cu x Fe 16 O 27 compounds with a Cu content of x = 0 0.5, 1.0. Semisintering was conducted at 1275 °C for 1 h based on extensive previous research [12,19,20], and the final sintering was conducted at 1250 °C for 0.5 h in air. As seen, J m and J r reached their highest values at a Cu content of x = 0.3 and were maintained at about a constant level as x further increased.…”

“…However, suggested fabrication methods require quite complicated atmosphere control, which makes it difficult to scale up production at the present time. Earlier, one of the authors of this paper reported reaching a single W phase without atmosphere control by adding BaO to the BaO2ZnO8Fe 2 O 3 compound after semisintering treatment [19]; however, its magnetic properties were not satisfactory. Toyoda [21] and Yasuda and colleagues [22] also reported reaching good magnetic properties by conducting sintering in an atmosphere of nitrogen, but this method is rather complicated for mass production.…”

Properties of Anisotropic Ba-Zn-Cu System W-Type Hexagonal Ferrite Magnets

“…Figure 1 presents magnetic characteristics of the BaZn 2x Cu x Fe 16 O 27 compounds with a Cu content of x = 0 0.5, 1.0. Semisintering was conducted at 1275 °C for 1 h based on extensive previous research [12,19,20], and the final sintering was conducted at 1250 °C for 0.5 h in air. As seen, J m and J r reached their highest values at a Cu content of x = 0.3 and were maintained at about a constant level as x further increased.…”