Solid Phase Synthesis of Cobalt Ferrite Under the Action of a DC Glow Discharge at Atmospheric Pressure

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL

Plasma Chemistry and Plasma Processing Pub Date : 2024-06-19 DOI:10.1007/s11090-024-10466-8

Dmitriy A. Shutov, Kristina V. Smirnova, Alexander N. Ivanov, Sergey I. Kartashov, Vladimir V. Rybkin

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Abstract

The paper presents a novel method for obtaining cobalt ferrites with a spinel type structure under the action of a nonequilibrium atmospheric pressure gas-discharge plasma in air on a mixture of solid iron and cobalt hydroxonitrates. The data of energy dispersive X-ray spectroscopy and X-ray phase analysis showed that the synthesized powders have a complex phase and chemical composition, which depends on the Fe:Co molar ratio in the initial salts. The best result in terms of yield of cobalt ferrite is obtained with Fe:Co = 2:1. The resulting material contains 86 wt% Fe₂CoO₄, also 13.5 wt% Fe₂O₃ and 0.5 wt% Fe₃O₄. At other ratios, Co₃O₄ is also formed. According to dynamic light scattering data, the obtained powders consist of two characteristic fractions. The main fraction (94%) is represented by particles 105 ± 4 nm in size. And the other fraction (6%) consists of particles 18 ± 4 nm in size. The resulting materials have magnetic properties. So, for powders obtained from salts with Fe:Co = 2:1 the coercive force was \(\sim\)490 Oe. The saturation magnetization was \(\sim\)52 emu/g, and the remnant magnetization was \(\sim\)22 emu/g.

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常压直流辉光放电作用下的钴铁氧体固相合成

本文介绍了一种新方法，即在非平衡大气压气体放电等离子体在空气中对固体铁和钴羟基硝酸盐混合物的作用下，获得具有尖晶石型结构的钴铁氧体。能量色散 X 射线光谱和 X 射线相分析数据表明，合成的粉末具有复杂的相和化学成分，这取决于初始盐中的铁钴摩尔比。Fe:Co = 2:1 时，钴铁氧体的产量最高。所得材料含有 86 wt% 的 Fe2CoO4、13.5 wt% 的 Fe2O3 和 0.5 wt% 的 Fe3O4。在其他比例下，也会形成 Co3O4。根据动态光散射数据，获得的粉末由两个特征部分组成。主要部分（94%）的颗粒大小为 105 ± 4 nm。另一部分（6%）由大小为 18 ± 4 nm 的颗粒组成。由此产生的材料具有磁性。因此，从Fe:Co = 2:1的盐中得到的粉末的矫顽力为（\sim\）490 Oe。饱和磁化率为 52 emu/g，残余磁化率为 22 emu/g。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.