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首页> 外文期刊>Journal of synchrotron radiation >Synthesis and fading of eighteenth-century Prussian blue pigments: A combined study by spectroscopic and diffractive techniques using laboratory and synchrotron radiation sources
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Synthesis and fading of eighteenth-century Prussian blue pigments: A combined study by spectroscopic and diffractive techniques using laboratory and synchrotron radiation sources

机译：十八世纪普鲁士蓝颜料的合成和褪色：使用实验室和同步辐射源通过光谱和衍射技术进行的组合研究

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摘要

Prussian blue, a hydrated iron(III) hexacyanoferrate(II) complex, is a synthetic pigment discovered in Berlin in 1704. Because of both its highly intense color and its low cost, Prussian blue was widely used as a pigment in paintings until the 1970s. The early preparative methods were rapidly recognized as a contributory factor in the fading of the pigment, a fading already known by the mid-eighteenth century. Herein two typical eighteenth-century empirical recipes have been reproduced and the resulting pigment analyzed to better understand the reasons for this fading. X-ray absorption and M?ssbauer spectroscopy indicated that the early syntheses lead to Prussian blue together with variable amounts of an undesirable iron(III) product. Pair distribution functional analysis confirmed the presence of nanocrystalline ferrihydrite, Fe_(10)O_(14)(OH)_2, and also identified the presence of alumina hydrate, Al10O14(OH)2, with a particle size of ～15 ?. Paint layers prepared from these pigments subjected to accelerated light exposure showed a tendency to turn green, a tendency that was often reported in eighteenth-and nineteenth-century books. The presence of particles of hydrous iron(III) oxides was also observed in a genuine eighteenth-century Prussian blue sample obtained from a polychrome sculpture.
机译：普鲁士蓝是一种水合六氰铁酸铁（III）的水合物，是1704年在柏林发现的一种合成颜料。由于其强烈的色彩和低成本，普鲁士蓝被广泛用作绘画中的颜料，直到1970年代。 。早期的制备方法被迅速认为是颜料褪色的一个重要因素，这种褪色是18世纪中叶已经知道的。在此，已复制了两种典型的18世纪经验配方，并对所得的颜料进行了分析，以更好地了解这种褪色的原因。 X射线吸收和Msssbauer光谱表明，早期合成会导致普鲁士蓝，以及数量不等的不良铁（III）产物。偶对分布函数分析证实了纳米晶铁水铁矿Fe_（10）O_（14）（OH）_2的存在，并确定了水合氧化铝Al10O14（OH）2的存在，其粒径约为15？。由这些颜料制得的涂料层在加速曝光下表现出变绿的趋势，这种趋势在18世纪和19世纪的书中经常报道。在从多色雕塑中获得的真正的18世纪普鲁士蓝样品中，也观察到了水合氧化铁（III）颗粒的存在。

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