纯相W型铁氧体BaZn_(2(1-x))(LiFe)_xFe_(16)O_(27)的制备

Preparation of W-Type Ferrite BaZn_(2(1-x))(LiFe)_xFe_(16)O_(27)

本文报道了用共沉与高温助熔相结合的方法制备一种 W-型六角铁氧体。探讨了制备条件对产品相组成的影响。这种 W-型铁氧体是通过对 Zn_2-W(BaZn_2Fe_(16)O_(27))进行代换:2 Zn_2(?)Li^++Fe^(3+)而得到的,这种代换曾用在尖晶石铁氧体中,并已获得了成功。产品的 X 衍射相分析结果表明,要得到纯相 W-型铁氧体,需要控制共沉浆料 pH=8.0～8.5,烧结温度 T=1250～1300℃,保温期 t=20～30min 并且要打开炉门强制冷却。制得的纯 W 相六角铁氧体的比饱和磁化强度 σ_(?)=76Am^2/kg,接近国外报道的 Zn_2-W 和 Fe_2-W 的比饱和磁化强度值。

A kind of W-type ferrite has been prepared by using the coprecipitation me-thod combined with high temperature melting.The influence of preparing conditionson the phase compositions has been reseached.This W-type ferrite can be obtainedthrough the substitution:2 Zn^(2+)(?)Li^++Fe^(3+) for Zn_2-W(BaZn_2Fe_(16)O_(27)).Such a su-bstitution has already been successful in spinal ferrite family.To obtained the pure W-phase ferrite,according to the result of the phase an-alysis of X-ray diffraction,it is necessary to keep pH of the mixed slurry in therange of 8.0-8.5,sintering temperature at 1250-1300℃ and sintering period for20-30 min.The saturation magnetization of the pure W-phase ferrite prepared isσ_s=76Am^2/kg nearly as high as those of the previously known Zn_2-W or Fe_2-Wferrites.