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The Influence of Mn(II) and Aging Time in the Ferrihydrite to Goethite Transformation

机译:三水铁矿向针铁矿转变中Mn(II)和时效时间的影响

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The ferrihydrite-goethite transformation in samples of pure- and Mn-ferrihydrite was investigated in order toelucidate the effect of Mn(II) in the aging process. Samples of pure- and Mn-ferrihydrites were aged for different times,and their structural changes were described on the basis of Rietveld structure refinements. A comparison of two series ofsamples with (A-series) and without Mn (F-series) shows b- enlargement and a- and c- shortening due to the presence ofMn during the complete aging process. However, with aging different trends are observed in both the series. In the samplessynthesized without Mn(II) the variations in all the unit-cell constants are virtually negligible, whereas in the serieswith Mn(II) more significant changes are reflected by the enlargement of a- and c- and the shortening of the b. These resultsconfirm that the dimensions of the lattice parameters depend not only on the substitution ratio but also on the aginghistory of the sample.
机译:为了阐明Mn(II)在时效过程中的作用,研究了纯铁锰矿和锰铁锰矿样品中的亚铁酸盐-针铁矿转变。对纯铁锰矿和锰铁锰矿样品进行了不同的时效处理,并根据Rietveld的结构细化描述了它们的结构变化。对具有(A系列)和不具有Mn(F系列)的两个系列样品的比较显示,由于在完全时效过程中存在Mn,b增大,a和c缩短。但是,随着年龄的增长,两个系列都观察到不同的趋势。在没有Mn(II)的合成样品中,所有晶胞常数的变化几乎可以忽略不计,而在具有Mn(II)的系列中,a和c-的增大和b的缩短反映了更显着的变化。这些结果证实,晶格参数的尺寸不仅取决于取代比,而且还取决于样品的老化历史。

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