Zn-Ti取代的BaFe_(12)O_(19)铁氧体

ZnTi-Substituted Hexaferrite BaFe_(12)O_(19)

采用标准陶瓷工艺，并进行湿压磁场成型和氧气氛烧结，制备了高取向度、低介电损耗的各向异性 Ｂａ（ＺｎＴｉ）ｘＦｅ１２－２ｘＯ１９多晶六角铁氧体。随着ｘ值增大，磁化强度减小，居里温度下降，磁晶各向异性常数减小。结果可以通过假设Ｚｎ２＋取代了四面体 ４ｆ１次点阵位和六面体 ２ｂ次点阵位上的 Ｆｅ３＋；Ｔｉ４＋取代了自放向上的八面体 １２ｋ，２ａ次点阵位上的 Ｆｅ３＋来解释。

Magnetic anisotropic Polycrystalline Ba(ZnTi)x.Fe12-2x.O19 hexaferrites have been prepared with high orientation degrees f and low dielectric loss tgδε by standard ceramic techniques with magnetic alignment of the grains c axes during wet pressing and in flowing oxygen sintering. When x increases, the saturation magnetization M,, the Curie temperature 7. and the anisotropy field H. of Ba(ZnTi).Fe12-2xO19. hexaferrites decrease. The results can be interpreted by assuming that Zn2+ ions replaces Fe3+ ions of the tetrahedral 4f1 sites and hexahedral 2b sites.Ti4+ ions replaces spin up re+ ious of octahedral sublattices 12k and 2a.