0441814 20240103205821.120150402235959.9 84923016334 000349891900006 10.1002/jrs.4627 8 s. cav_un_epca*02571040377-0486462 (2015)236-243Wiley fluorite pigment fluorescence bands diffraction lines broadening irradiation cav_un_auth*0287834 Academic Laboratory of Material Research of Painted Artworks Čermáková Zdeňka UACH-T Akademická laboratoř materiálového průzkumu malířských děl (ALMA) Academic Materials Research Laboratory of Painted Artworks (ALMA) ALMA ALMA CZ K Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0102644 Academic Laboratory of Material Research of Painted Artworks Bezdička Petr UACH-T Akademická laboratoř materiálového průzkumu malířských děl (ALMA) Academic Materials Research Laboratory of Painted Artworks (ALMA) ALMA ALMA CZ Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0016574 Němec I. CZ cav_un_auth*0243727 Hradilová J. CZ cav_un_auth*0054535 Šrein V. CZ cav_un_auth*0254045 Department of Image Processing Blažek Jan UTIA-B Zpracování obrazové informace Department of Image Processing ZOI ZOI Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0102665 Academic Laboratory of Material Research of Painted Artworks Hradil David UACH-T Akademická laboratoř materiálového průzkumu malířských děl (ALMA) Academic Materials Research Laboratory of Painted Artworks (ALMA) ALMA ALMA CZ Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0285028 GAP103/12/2211 GA ČR 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. CA 2016 4 A hod 4ah 20231122140847.8 RVO:61388980 RVO:67985556 http://hdl.handle.net/11104/0244784 1 Academic Laboratory of Material Research of Painted Artworks UACH-T 10406 CHEMISTRY, ANALYTICAL S RIV/61388980:_____/15:00441814!RIV16-AV0-61388980 191735633 neshodný kód oboru UACH-T RIV/67985556:_____/15:00441814!RIV16-AV0-67985556 191683334 neshodný kód oboru UTIA-B RIV/67985556:_____/15:00441814!RIV16-GA0-67985556 191719075 neshodný kód oboru UTIA-B SPECTROSCOPY 2.306 0.727 7.6 0.01062 0.537 8440 1.020 Q1 1.841 176 Q2 68.49 66.3 Q2 Q2 66.279 2015 Soubory v repozitáři: 0441814.pdf 84923016334 SCOPUS 000349891900006 WOS cav_un_epca*0257104 Journal of Raman Spectroscopy 0377-0486 1097-4555 Roč. 46 č. 2 2015 236 243 Wiley