Characterization of iron oxide-based pigments by synchrotron-based micro X-ray diffraction
Characterization of iron oxide-based pigments by synchrotron-based micro X-ray diffraction
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通过基于同步加速器的微 X 射线衍射表征氧化铁基颜料
DOI：
10.1016/j.clay.2008.01.021
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发表时间：
2008
影响因子：
5.6
通讯作者：
J. Pérez
中科院分区：
文献类型：
--
作者：
L. Herrera;M. Cotte;M. C. J. Haro;A. Durán;Á. Justo;J. Pérez
由于铁在薄层中的浓度较低且相对于其他相的反射能力较低，因此通过传统的 X 射线衍射来表征微样品中的铁是很困难的。同步辐射由于强度高、样品穿透力强、光束直径小和数据采集快，可以提供独特的信息。在这项研究中，获得了取自科尔多瓦圣奥古斯丁教堂壁画的两个样品的微 X 射线衍射 (μ-XRD) 数据。在画作薄层的横截面中识别出了针铁矿、纤铁矿和赤铁矿等结晶铁相，具有良好的空间分辨率。传统 XRD 仅检测到水白铅矿和白铅矿，而不是 μ-XRD 实验中发现的全部铁相。
The characterization of iron in microsamples by conventional X-ray diffraction is difficult due to its low concentration in thin layers and its low reflecting power relative to other phases. Synchrotron radiation can provide unique information because of high intensity, sample penetration, small beam diameter and fast data collection. In this study, micro X-ray diffraction (μ-XRD) data were obtained of two samples taken from wall paintings at San Agustin's Church in Cordoba. Crystalline iron phases such as goethite, lepidocrocite and hematite in the cross-section of the painting thin layers were identified, with a good spatial resolution. Conventional XRD only detected hydrocerussite and cerussite rather than the full range of iron phases found in the μ-XRD experiments.