论文标题
Zn掺杂的Mn铁氧体纳米结构的合成和表征
Synthesis and characterization of Zn doped Mn ferrites nanostructures
论文作者
论文摘要
使用共沉淀制造Zn掺杂的Mn铁氧体纳米颗粒。已经讨论了MNZN铁氧体的结构，磁性和光学特性的变化。首先，将样品合成，在不同的温度下退火，然后进行表征。通过X射线衍射（XRD），扫描电子显微镜（SEM），能量色散光谱（EDX），Ultra Viodible可见光谱法（UV-VIS光谱法）和振动样品磁力计（VSM）研究了合成的样品和退火样品。从XRD确定的MNZN铁氧体纳米颗粒的平均晶体大小在42至60 nm的范围内。这些纳米颗粒具有正常的尖晶石结构。 SEM图像显示了样品的物理形状，这表明AS准备的样品更加凝聚，并且具有像形状一样的片状，而不是在700C下退火，而样品在700C时具有纵向或杆子的形状。还计算了NPS的固化（HC），饱和磁化（MS）和延期（MR）。 （MS）值从26个EMU/g增加到65个，强制性（HC）从13个OE不等，而Remanence（MR）也显示出趋势的增加，尽管趋势越来越小，但从0.031到0.798 EMU/g，这是其体积计数器部分的一小部分。样品的带隙能显示出趋势下降，因为粒径的增加为3.5至2.9 eV。
Zn doped Mn ferrites nanoparticles were fabricated by using Co-precipitation. Variation in structure, magnetic and optical properties of MnZn ferrites has been discussed. First of all, samples were synthesized, annealed at different temperatures and then characterized. The as-synthesized and annealed samples were investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy Dispersive spectroscopy (EDX), Ultra Violet visible spectrometry (Uv-Vis spectrometry) and Vibrating sample magnetometer (VSM). The average crystallite size of MnZn ferrites nanoparticles determined from XRD were in the range of 42 to 60 nm. These nanoparticles possess normal spinel structure. The SEM images showed the physical shape of the samples, which showed that the as prepared samples are more agglomerated and having flake like shape rather than annealed at 700C while the samples have longitudinal or rod like shape on annealing at 700C. The coercivity (Hc), saturation magnetization (Ms), and remanence (Mr) of Nps were also calculated. The (Ms) value is increasing from 26 to 65 emu/g, the coercivity (Hc) is varying from 13 to 193 Oe and remanence (Mr) has also showing increasing trend although very less, from 0.031 to 0.798 emu/g which are a little part of their bulk counter parts. The band gap energy of the samples was showing decreasing trend as with the increase of particle size which is of the order of 3.5 to 2.9 eV.
