CAJ | 학술논문

在不同金属离子浓度(0.1~0.3mol/L)和pH值(<1～10)下，通过简单的溶胶-凝胶自蔓延燃烧法合成了六种尖晶石型CoFe2O4纳米粒子，采用X射线粉末衍射(XRD)、傅里叶变换红外光谱(FT-IR)、透射电镜(TEM)、N2吸脱附等手段对所得样品进行了表征，并采用振动样品磁强计(VSM)对样品的磁学性质进行了表征。结果表明，前驱体溶液的pH值及金属离子浓度对CoFe2O4纳米晶体的粒径、形貌及磁性均有影响。溶液pH值越高，金属离子浓度越大，所得产物的粒径也越大。样品的比饱和磁化强度随前驱体溶液pH值的升高而减小。
재불동금속리자농도(0.1~0.3mol/L)화pH치(<1～10)하，통과간단적용효-응효자만연연소법합성료륙충첨정석형CoFe2O4납미입자，채용X사선분말연사(XRD)、부리협변환홍외광보(FT-IR)、투사전경(TEM)、N2흡탈부등수단대소득양품진행료표정，병채용진동양품자강계(VSM)대양품적자학성질진행료표정。결과표명，전구체용액적pH치급금속리자농도대CoFe2O4납미정체적립경、형모급자성균유영향。용액pH치월고，금속리자농도월대，소득산물적립경야월대。양품적비포화자화강도수전구체용액pH치적승고이감소。
Six magnetic nanocrystalline spinel-type ferrite CoFe2O4 samples were prepared by simple sol-gel auto-combustion method from precursor solutions with different metal concentrations (0.1-0.3 mol/L) and various pH values (<1-10). The samples were characterized by X-ray diffractometry (XRD), Fourier transform infrared spectrophotometry (FT-IR), N2 physisorption and transmission electron microscopy (TEM). Their magnetic properties were characterized by vibrating sample magnetometer (VSM) at room temperature. The results show that pH value and metal concentration of the precursor solution play important roles in the size, dispersion and morphology of the as-prepared CoFe2O4 nanocrystal, and thus in its magnetic property. The particle sizes of the samples increase with increasing pH value and metal concentration of the solutions, while the saturation magnetization values of the samples decrease with increasing pH values of the precursor solutions.