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Microanalysis of clay-based pigments in paintings by XRD techniques
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SYSNO ASEP 0451135 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Microanalysis of clay-based pigments in paintings by XRD techniques Author(s) Hradil, David (UACH-T) RID, SAI
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Hradilová, J. (CZ)
Vašutová, V. (CZ)Source Title Microchemical Journal. - : Elsevier - ISSN 0026-265X
Roč. 125, MAR (2016), s. 10-20Number of pages 11 s. Publication form Print - P Language eng - English Country US - United States Keywords Clay minerals ; Earth pigments ; Clay-binder interaction ; Powder X-ray micro-diffraction ; Quantitative phase microanalysis Subject RIV DB - Geology ; Mineralogy R&D Projects GA14-22984S GA ČR - Czech Science Foundation (CSF) Institutional support UACH-T - RVO:61388980 UT WOS 000369205900002 EID SCOPUS 84946887915 DOI 10.1016/j.microc.2015.10.032 Annotation Despite considerable advantages of the method in the field of microanalysis of pigments, powder X-ray micro-diffraction has not yet been satisfactorily tested for correct and unambiguous discrimination of clay structures in colour layers of paintings and, eventually, for reliable quantitative analysis of their relative contents. To overcome this lack of knowledge, several sets of laboratory experiments with model mixtures and reference samples imitating real paint layers have been performed and general rules for proper discrimination of clay structures have been described. As an integral part of the research, clay-binder interactions were studied to avoid misleading interpretations. It was found out that various characteristic shifts of basal diffraction lines depend on the type of organic binder and the relative content of expandable layers in the clay structure. Based on these results, it was possible to differentiate pure smectites, interstratified illite/smectite structures and chlorites in paint and preparatory layers of actual paintings. The accuracy of quantitative microanalysis of clay minerals in mixtures with other minerals in Mid-European red earth pigments (typically containing kaolinite, illite, quartz, hematite, and anatase) was characterised by total bias values in the range of 3-10 wt.%. Finally, results were applied to differentiation of earth pigments of various provenances in grounds of Baroque paintings and Early Renaissance preparation layers for gilding. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2017
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