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首页> 外文期刊>CERAMICS INTERNATIONAL >Cations distribution and magnetic properties of Co-Zr doped BaCo_xZr_xFe_(12-2x)O_19 prepared via citrate precursor sol-gel route
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Cations distribution and magnetic properties of Co-Zr doped BaCo_xZr_xFe_(12-2x)O_19 prepared via citrate precursor sol-gel route

机译：柠檬酸盐前体溶胶-凝胶法制备掺Co-Zr的BaCo_xZr_xFe_（12-2x）O_19的阳离子分布和磁性能

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The aim of this work is to investigate the correlation between the distribution of cations over five crystallographic positions and magnetic properties of Ba-hexaferrites (BHF) in the coupled substitution of magnetic Co~(2+) and non-magnetic Zr~(4+) for Fe~(3+). We have accomplished the synthesis of Co-Zr doped BaCo_xZr_xFe_(12-2x)O_19 (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) by citrate precursor sol-gel method under acidic conditions. These compounds were characterized by TGA-DTA, FT-IR and XRD. Pure single phase M-type hexagonal ferrites are formed at 800 °C. No secondary phase is evident from XRD. However, ND establishes small CoFe_2O_4 phase impurity at 0.6 level which increases at higher concentrations. MS and ND are employed to probe into the changes at the microscopic level. Dopant ions largely prefer 4f_1 and 2a sites up to 0.6 level while substitution at 4f_1 and 12k sites is indicated at higher concentrations. Contrary to the conventional thought Co~(2+) occupies the tetrahedral 4f_1 sub-lattice while Zr~(4+) is located in an octahedral 2a/12k site. Magnetic hysteresis data show that the coercive force is reduced with increasing Co-Zr contents but the net magnetizations of the samples are not correlated with dopant level. Our results suggest that the magnetization and magneto-crystalline anisotropy are closely related to the distribution of Co-Zr on the five sites.
机译：这项工作的目的是研究在磁性Co〜（2+）和非磁性Zr〜（4+）的耦合取代中Ba-六价铁氧体（BHF）的五个晶体学位置上的阳离子分布与磁性之间的相关性）表示Fe〜（3+）。我们已经在酸性条件下通过柠檬酸盐前体溶胶-凝胶法完成了Co-Zr掺杂BaCo_xZr_xFe_（12-2x）O_19（x = 0.0、0.2、0.4、0.6、0.8和1.0）的合成。这些化合物通过TGA-DTA，FT-IR和XRD表征。在800°C时形成纯单相M型六角铁氧体。 XRD没有发现第二阶段。但是，ND在0.6的水平上建立了少量的CoFe_2O_4相杂质，并在较高的浓度下增加。 MS和ND用于从微观角度探究变化。掺杂离子在很大程度上更喜欢4f_1和2a位点，最高至0.6的水平，而4f_1和12k位点的取代则表明浓度更高。与传统想法相反，Co〜（2+）占据四面体4f_1子晶格，而Zr〜（4+）位于八面体2a / 12k位置。磁滞数据表明，矫顽力随Co-Zr含量的增加而降低，但样品的净磁化强度与掺杂水平无关。我们的结果表明，磁化强度和磁晶各向异性与Co-Zr在五个位置上的分布密切相关。

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