提出了一种由层状前体合成单一晶相镍锌尖晶石的方法,对NiZn-Fe(Ⅱ)-Fe(Ⅲ)SO4水滑石的制备进行了研究,合成了Ni^2+、Zn^2+、Fe^2+、Fe^3+摩尔比分别为1:2:5:2,3:3:i0:4,2:1:5;2,5:1:i0:4的系列水滑石层状前体;探讨了合成条件对晶体结构的影响,研究了层状前体焙烧产物的磁学特性。结果表明:四种摩尔比的配方均可制备出晶型较好的水滑石层状前体,焙烧产物为晶相单一的尖晶石铁氧体,其中当摩尔比为3:3:10:4时,产物尖晶石铁氧体的磁学特性较高,比饱和磁化强度高达78.89A·m^2·kg^-1。
The single phase spinel NiZnFe2O4 ferrite was prepared by calcining layered NiZn-iron(Ⅱ)-iron(Ⅲ) hydrotalcite precursors The hydrotalcite with different Ni^2+ : Zn^2+: Fe^2+: Fe^3+ molar ratios of 1 : 2 : 5 : 2, 3 : 3 : 10 : 4,2 : 1 : 5 : 2, 5 : 1 : 10 : 4 were prepared. The effect of reaction condition on the crystal structure was also investigated. The layered double hydroxide(LDH) and resulting hydrotalcite calcined products were characterized by XRD, IR, TG-DTA and VSM The results showed when the molar ratio of Ni^2+ : Zn^2+ : Fe^2+ : Fe^3+ in the mixture was 3 : 3 : 10 : 4, the material obtained by calcining the resulting hydrotalcite was a single phase spinel and the sample exhibited excellent magnetic properties with intensity of saturation 78. 89 A ·m^2· kg^-1.