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首页> 外文期刊>Materials transactions >Synthesis of Ferrite Nanoparticles by Mechanochemical Processing Using a Ball Mill
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Synthesis of Ferrite Nanoparticles by Mechanochemical Processing Using a Ball Mill

机译：球磨机机械化学法合成铁氧体纳米粒子

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摘要

Ferrites with the spinel structure have a wide field of technological applications. In the present study, various ferrite (Fe_3O_4, CoFe_2O_4 and Ni_(0.5)Zn_(0.5)Fe_2O_4) nanoparticles were synthesized by mechanochemical reaction in aqueous solution of various chlorides (FeCl_3, CoCl_2 or NiCl_2/ZnCl_2 and NaOH in a horizontal ball mill. Structures, morphologies, compositions and magnetic properties of the synthesized nanoparticles were investigated using X-ray diffraction (XRD), analytical high-resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer (VSM). It was revealed that the particle size of the ferrite nanoparticles can be controlled by milling conditions. such as the milling time and the pH value (R value) of starting solution. The average size of Fe_3O_4 particles milled for 259.2 ks and 432.0 ks at R = 1 were 30 nm and 20 nm, respectively. Also, the particles milled for 259.2ks at R = 0.5 had the size of 100 nm. The formation of Fe_3O_4 nanoparticles from the aqueous solutions with the different R values proceeded via two different processes. In the case of R not= 1, alpha-Fe nanoparticles formed first, and then oxidized to become Fe_3O_4 nanoparticles. Meanwhile, in the case of R not=1, alpha-FeOOH phase formed, and changed to Fe_3O_4 nanoparticles by milling. For magnetic properties, the magnetization at 1.2 MA/m was the value of 72 mu Wb centre dot m/kg after milling for longer than 86.4 ks with R = 1. The coercivity was the maximum of 10.8 kA/m after milling for 259.2 ks with R = 0.5. The particle sizes of CoFe_2O_4 milled for 259.2ks at R = 1 and Ni_(0.5)Zn_(0.5)Fe_2O_4 milled for 345.6 ks at R = 1 were about 30 nm. The magnetization values of CoFe_2O_4 and Ni_(0.5)Zn_(0.5)Fe_2O_4 were about 55 mu Wb centre dot m/kg, with coercivity values of 43.4 kA/m and 5.3 kA/m, respectively.
机译：具有尖晶石结构的铁氧体具有广泛的技术应用领域。在本研究中，通过在卧式球磨机中在各种氯化物（FeCl_3，CoCl_2或NiCl_2 / ZnCl_2和NaOH）的水溶液中进行机械化学反应，合成了各种铁氧体（Fe_3O_4，CoFe_2O_4和Ni_（0.5）Zn_（0.5）Fe_2O_4）纳米粒子。用X射线衍射（XRD），高分辨率高分辨率透射电子显微镜（HRTEM）和振动样品磁强计（VSM）研究了合成纳米颗粒的结构，形态，组成和磁性能。铁氧体纳米颗粒可以通过研磨条件来控制，例如研磨时间和起始溶液的pH值（R值），在R = 1时研磨259.2 ks和432.0 ks的Fe_3O_4颗粒的平均粒径为30 nm和20 nm，同样，在R = 0.5时研磨259.2ks的颗粒的大小为100 nm，不同R值的水溶液中Fe_3O_4纳米颗粒的形成通过两个不同的过程进行。租金流程。在R not = 1的情况下，首先形成α-Fe纳米颗粒，然后氧化成为Fe_3O_4纳米颗粒。同时，在R not ＝ 1的情况下，形成α-FeO​​OH相，并且通过研磨而变成Fe_3O_4纳米颗粒。对于磁性，在R大于1的情况下，铣削超过86.4 ks（R = 1）后，在1.2 MA / m处的磁化强度为72μWb中心点m / kg。在铣削259.2 ks后，矫顽力最大值为10.8 kA / m R = 0.5。在R ＝ 1下研磨259.2ks的CoFe_2O_4和在R ＝ 1下研磨345.6ks的Ni_（0.5）Zn_（0.5）Fe_2O_4的粒径约为30nm。 CoFe_2O_4和Ni_（0.5）Zn_（0.5）Fe_2O_4的磁化强度约为55μWb中心点m / kg，矫顽力值分别为43.4 kA / m和5.3 kA / m。

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