微波辅助合成镍铁尖晶石纳米片晶(英文)

FORMATION OF NANOSIZED NICKEL FERRITE PLATE-LIKE CRYSTAL ASSISTED WITH MICROWAVE RADIATION

以FeSO4·7H2O,NiSO4·6H2O和NaOH为反应物,充分研磨后经微波辐射和常规热处理分别制得NiFe2O4纳米粉体。通过X射线衍射和扫描电镜分析了粉体的相结构和形貌,并分析了微波作用与NiFe2O4形成的关系。结果表明:在热处理过程中存在的Na2SO4熔盐作为模板使得NiFe2O4晶粒呈片状,而采用微波技术可以快速地获得粒径分布均匀的单相NiFe2O4纳米片晶。由于NiFe2O4是一种磁性介电材料,在低温下,其磁偶极子易与微波发生相互作用,从而可以有效地解决存在于常规低温固相反应中的热控问题。

Two types of nickel ferrite nanopowder were prepared by the solid state method using microwave radiation or general heating of the precursor synthesized using FeSO4·7H2O, NiSO4·6H2O and NaOH as reactants by grinding. The phase structure and morphology of the powder were analyzed by X-ray diffraction and scanning electron microscopy. The mechanism of NiFe2O4 coupling to microwaves was analyzed. The results show that NiFe2O4 plate-like particles can be obtained by the product of Na2SO4 melt as template during the microwave treatment to make the NiFe2O4 crystal grow in the form of a plate. It is a single phase NiFe2O4 nano-sized plate-like crystal with uniform particle size. Because NiFe2O4 is a magnetic spinel dielectric material, at lower temperatures, the relation of the initial coupling to microwaves occurs easily by the magnetic dipoles, and it effectively solves the heat controlling problem that exists in low temperature solid state reactions.