二价和三价金属取代对Co2Y六角铁氧体磁性能的改性
Modification of the Magnetic Properties of Co2Y Hexaferrites by Divalent and Trivalent Metal Substitutions
摘要：
本研究涉及Me 2 Y取代六角铁氧体Ba 2 Me 2Fe 12-xTxO 22（Me = Co ~（2+），Mg ~（2+），Cr ~（2+），T = Fe ~（3+），Ga ~（3+））的制备和表征。通过常规球磨技术和在1200° C下烧结来制备样品。研究了Me和T离子的选择对六角铁氧体的结构和磁性能的影响。Co2 Y的XRD图谱、磁参数和穆斯堡尔谱与单相Y型六角铁氧体一致。然而，CoCr-Y样品被发现是由Y型六角铁氧体为主，和M型和BaCrO 4少数相观察样品的XRD图谱。因此，饱和磁化强度从约34 emu/g到37.5 emu/g的小幅增加归因于M型相的发展。另一方面，Cr2 Y样品的XRD图谱表明该样品中M型相占主导地位。该样品的高矫顽力（1445 Oe）是材料从典型的软磁材料（Y型）转变为硬磁体（M型）的证据。Ga取代Fe对Co_2Y的饱和磁化强度影响不大，但磁化强度降低。然而，样品Ba 2CoMgFe 11 GaO 22表现出显着的饱和磁化强度下降到一个值26.6 emu/g，这可能是由于由Mg 2+取代引起的超交换相互作用的衰减。
英文摘要：
The present study is concerned with the fabrication and characterization of Me2Y substituted hexaferrites, Ba2Me2Fe12-xTxO22 (Me = Co2+, Mg2+, and Cr2+, and T = Fe3+, and Ga3+). The samples were prepared by the conventional ball milling technique and sintering at 1200° C. The effect of the choices of Me and T ions on the structural and magnetic properties of the hexaferrites were investigated. XRD patterns, magnetic parameters, and Mössbauer spectra of the Co2Y were consistent with a single phase Y-type hexaferrite. However, the CoCr-Y sample was found to be dominated by the Y-type hexaferrite, and M-type and BaCrO4 minority phases were observed in the XRD pattern of the sample. The small increase in saturation magnetization from about 34 emu/g up to 37.5 emu/g was therefore attributed to the development of the M-type phase. On the other hand, XRD pattern of the Cr2Y sample indicated the dominance of the M-type phase in this sample. The high coercivity (1445 Oe) of this sample is evidence of the transformation of the material from a typically soft magnetic material (Y-type) to a hard magnet (M-type). The Ga-substitution for Fe in Co2Y did not affect the saturation magnetization significantly, but the coercivity was reduced. However, the sample Ba2CoMgFe11GaO22 exhibited a significant reduction of the saturation magnetization down to a value 26.6 emu/g, which could be due to the attenuation of the super-exchange interactions induced by the Mg2+ substitution.
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