On the akaganeite crystal structure, phase transformations and possible role in post-excavational corrosion of iron artifacts
On the akaganeite crystal structure, phase transformations and possible role in post-excavational corrosion of iron artifacts
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DOI：
10.1016/s0010-938x(03)00078-7
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发表时间：
2003-11-01
影响因子：
8.3
通讯作者：
van Lanschot, J
中科院分区：
文献类型：
--
作者：
Ståhl, K;Nielsen, K;van Lanschot, J
用常规X射线、同步辐射X射线和中子粉衍射法研究了赤铁矿和赤铁矿的晶体结构。蓝晶石的化学式为FeO_(0.833)(OH)(1.167)Cl-0.167。晶体结构不含游离水。加热到200摄氏度以下不会改变蓝晶石的结构。最初的水分损失可以归因于由于非常小的颗粒尺寸而产生的大量吸附水；0.15微米乘0.03微米。只有在转化为赤铁矿的过程中，氯化物才会从结构中释放出来。由于其稳定性，阿卡奈石的存在本身不会对铁文物构成威胁，但它更像是酸性环境中存在高浓度氯化物的征兆。(C)2003爱思唯尔有限公司。保留所有权利。
The crystal structure of akaganeite and the akaganeite to hematite transition has been studied by means of conventional and synchrotron X-ray and neutron powder diffraction. The chemical formula of akaganeite can be written as FeO0.833(OH)(1.167)Cl-0.167. The crystal structure does not contain free water. Heating below 200 degreesC will not alter the akaganeite structure. Initial water loss can be attributed to a large amount of adsorbed water due to a very small particle size; 0.15 mum by 0.03 mum. Chloride is released from the structure only in connection with the transformation to hematite. Due to its stability, the presence of akaganeite does not in itself posses a threat to iron artifacts, but it is rather a symptom of the presence of high concentrations of chloride in an acidic environment. (C) 2003 Elsevier Ltd. All rights reserved.