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Effect of Co/Fe co-doping in TiO_2 rutile prepared by solid state reaction

机译：固相反应制备Co / Fe共掺杂对TiO_2金红石的影响

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摘要

We investigated the magnetic and structural properties of TiO_2 rutile single- and codoped with Fe and Co prepared by a solid state reaction method. The concentrations of each dopant was varied from 0 to 5%. Most of the samples were ferromagnetic at room temperature. When Co or Fe was single-doped to 3%, only weak room temperature ferromagnetism was observed. But when 1 % of Fe or Co was additionally co-doped, magnetic moment per magnetic ion, remnant magnetization, and coercivity were significantly enhanced compared to the single-doped case, and this behavior was observed up to 5% co-doping. The structural study showed the TiO_2 rutile phase for all of the samples with second phases of Fe_2TiO_5 and/or CoTiO_3 depending on the contents of Co and Fe, but no indication of Co or Fe metallic cluster was found. The micro composition analysis showed the linear correlation between Co and Fe concentrations, which is a result of enhanced incorporation of magnetic ions into TiO_2 host when co-doped. The Moesbauer spectrum showed that the value of the hyperfine field is about 1.5 times as large as that of α-Fe indicating that the Fe impurities substituted into Ti atoms instead of forming iron clusters.
机译：我们研究了固态反应法制备的单相和共掺杂铁和钴的TiO_2金红石型TiO_2的磁性和结构性能。每种掺杂剂的浓度在0至5％之间变化。大多数样品在室温下都是铁磁性的。当Co或Fe被单掺杂至3％时，仅观察到弱的室温铁磁性。但是，当另外掺入1％的Fe或Co时，与单掺杂的情况相比，每个磁性离子的磁矩，剩余磁化强度和矫顽力都得到了显着提高，并且观察到这种行为高达5％的共掺杂。结构研究表明，所有样品中的TiO_2金红石相都具有第二相Fe_2TiO_5和/或CoTiO_3，具体取决于Co和Fe的含量，但未发现Co或Fe金属簇的迹象。微观组成分析表明，Co和Fe浓度之间存在线性关系，这是共掺杂时磁性离子向TiO_2主体中结合增加的结果。 Moesbauer光谱表明，超精细场的值约为α-Fe的1.5倍，表明Fe杂质取代了Ti原子而不形成铁簇。

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