XRD study of the goethite-hematite transformation: application to the identification of heated prehistoric pigments

被引:86
作者
Pomies, MP
Morin, G
Vignaud, C
机构
[1] Musees France, Lab Rech, CNRS, UMR 171, F-75041 Paris 01, France
[2] Univ Paris 06, Lab Mineral Cristallog, F-75005 Paris, France
[3] Univ Paris 07, Lab Mineral Cristallog, F-75005 Paris, France
[4] Lab Phys Liquides & Electrochim, CNRS, UPR 15, F-75005 Paris, France
来源
EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY | 1998年 / 35卷 / 01期
关键词
D O I
10.1016/S0992-4361(98)80011-8
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
When heated, yellow goethite dehydrates and transforms to red hematite. Both iron oxides were used by the Palaeolithic artists as pigments, one question being whether those people took advantage of the phase transformation. To answer this question, the dehydration of synthetic goethite was studied by XRD coupled to Rietveld refinement. It was shown that no hydroxylated hematite is formed during the early stages of dehydration, the presence of hydroxyl ions in materials treated at high temperatures being explained by trapped water inside porous microstructure (TEM). Archaeological samples from the south of France were investigated. Some of them exhibit distinctive features of heating, which supports the idea that Palaeolithic people used both natural and ex-goethite hematite.
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页码:9 / 25
页数:17
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