Abstract

The phase composition and structure of oxide and hydrogen-reduced iron–ruthenium systems are studied using conversion and adsorption Mössbauer spectroscopy, as well as X-ray diffraction methods. In samples with metal concentration (mass %) 50Fe–50Ru after calcination in air at 773 and 973 K, nanosystems containing two phases with different degrees of dispersion are formed (α-Fe₂O₃ with an admixture of Ru and RuO₂ with an admixture of Fe, respectively). Structural transformations of the nanosystem calcinated at 973 K in different reduction conditions are investigated. It is shown that the formation of nanostructures depends on the initial and final reduction temperatures. The presence of ruthenium substantially changes the reduction kinetics of oxide systems. It is shown that upon an increase in the reduction temperature, the rearrangement of initial stoichiometric oxides to intermediate oxide structures with varying compositions and with different crystal lattice types is observed. The terminating stage of reduction is the formation of metal clusters or solid solutions of intermetallides.

中文翻译：

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（1-x）Fe 2 O 3 -x RuO 2纳米系统在不同还原温度下的结构转变

摘要

使用转化和吸附穆斯堡尔光谱法以及X射线衍射方法研究了氧化物和氢还原铁钌体系的相组成和结构。与金属的浓度（质量％）样品50Fe-50Ru 773在空气中煅烧和973 k之后，形成含有两个相有不同程度的分散体的纳米系统（的α-Fe ₂ ö ₃与Ru和的RuO的混合物₂分别与铁的混合物）。研究了在不同还原条件下于973 K煅烧的纳米系统的结构转变。结果表明，纳米结构的形成取决于初始和最终还原温度。钌的存在大大改变了氧化物体系的还原动力学。结果表明，随着还原温度的升高，观察到初始化学计量的氧化物重排为具有不同组成和不同晶格类型的中间氧化物结构。还原的终止阶段是形成金属簇或金属间化合物的固溶体。