Crystallographic and magnetic properties of Cu2X, Co2X, and Ni2X hexaferrites

摘要: We have investigated the synthesis conditions and magnetic properties of X-type hexagonal ferrites. It is found that Ba2Cu2Fe28O46 (Cu2X), Ba2Co2Fe28O46 (Co2X), Ba2Ni2Fe28O46 (Ni2X) ferrites can be synthesized at a sintering temperature 1250 °C. The x-ray diffraction patterns for Cu2X, Co2X, Ni2X samples are in good agreement with pattern calculated from atomic coordinates Ba2Fe30O46 (Fe2X), where two peaks Q=2.24 2.30 A−1 clearly observed contrast other M-, W-, Y-, Z-types also low-temperature spontaneous magnetizations 47.5 μB/f.u., 43.4 μB/f.u., 43.2 μB/f.u., respectively. cation distributions discussed within model Neel-type collinear ferrimagnetic structure.