Počet záznamů: 1
Naturally irradiated fluorite as a historic violet pigment: Raman spectroscopic and X-ray diffraction study
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SYSNO ASEP 0441814 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Naturally irradiated fluorite as a historic violet pigment: Raman spectroscopic and X-ray diffraction study Tvůrce(i) Čermáková, Zdeňka (UACH-T) SAI
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Němec, I. (CZ)
Hradilová, J. (CZ)
Šrein, V. (CZ)
Blažek, Jan (UTIA-B) RID, ORCID
Hradil, David (UACH-T) RID, SAIZdroj.dok. Journal of Raman Spectroscopy. - : Wiley - ISSN 0377-0486
Roč. 46, č. 2 (2015), s. 236-243Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova fluorite ; pigment ; fluorescence bands ; diffraction lines broadening ; irradiation Vědní obor RIV CA - Anorganická chemie CEP GAP103/12/2211 GA ČR - Grantová agentura ČR Institucionální podpora UACH-T - RVO:61388980 ; UTIA-B - RVO:67985556 UT WOS 000349891900006 EID SCOPUS 84923016334 DOI 10.1002/jrs.4627 Anotace Naturally irradiated violet fluorite, a cubic CaF2mineral, is a rare historic pigment. Its documented usage in Europe stretches from ca. 1450 to ca. 1550. The intensely coloured violetish black naturally irradiated fluorite is commonly called antozonite, which is only vaguely defined based on its dark colour and specific odour emanated during grinding. In the published literature, there have been some discrepancies about its Raman spectrum. Therefore, sixteen samples of antozonite were analysed by Raman (micro-)spectroscopy using five different excitation laser wavelengths (445, 532, 633, 780 and 1064 nm), which revealed specific bands located below500 cm 1 probably related to radiation-caused defects. Their intensity increasedwith increasing violet colour saturation, thus providing a specification for antozonite’s definition. Spectra excited at 445 and 780nmcontained also numerous broad bands above 500 cm 1, which seem to be caused by the presence of rare earth elements. The structural damage of antozonite samples has been assessed by X-ray diffraction and related to their lightness using analysis of image histograms. The obtained results have been applied in the analysis of micro-samples of a Late Gothic altarpiece located in an Italian Court in UNESCO city Kutná Hora, Czech Republic, which contained exceptionally large grains of deep violet fluorite identified as antozonite. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2016
Počet záznamů: 1