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Statements

Subject Item
n2:RIV%2F60461446%3A52810%2F15%3A%230000168%21RIV15-GA0-52810___
rdf:type
skos:Concept n15:Vysledek
rdfs:seeAlso
http://onlinelibrary.wiley.com/doi/10.1002/jrs.4627/abstract
dcterms:description
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 below 500 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 780 nmcontained 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. Copyright (c) 2015 John Wiley & Sons, Ltd. 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 below 500 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 780 nmcontained 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. Copyright (c) 2015 John Wiley & Sons, Ltd.
dcterms:title
Naturally irradiated fluorite as a historic violet pigment: Raman spectroscopic and X-ray diffraction study Naturally irradiated fluorite as a historic violet pigment: Raman spectroscopic and X-ray diffraction study
skos:prefLabel
Naturally irradiated fluorite as a historic violet pigment: Raman spectroscopic and X-ray diffraction study Naturally irradiated fluorite as a historic violet pigment: Raman spectroscopic and X-ray diffraction study
skos:notation
RIV/60461446:52810/15:#0000168!RIV15-GA0-52810___
n3:aktivita
n19:I n19:P
n3:aktivity
I, P(GAP103/12/2211)
n3:cisloPeriodika
2
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n9:5758491 n9:9221972
n3:druhVysledku
n20:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
302
n3:idVysledku
RIV/60461446:52810/15:#0000168
n3:jazykVysledku
n7:eng
n3:klicovaSlova
fluorite; pigment; fluorescence bands; diffraction lines broadening; irradiation
n3:klicoveSlovo
n8:pigment n8:fluorite n8:irradiation n8:fluorescence%20bands n8:diffraction%20lines%20broadening
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[31D6F2ABB90F]
n3:nazevZdroje
Journal of Raman Spectroscopy
n3:obor
n6:AL
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
7
n3:projekt
n14:GAP103%2F12%2F2211
n3:rokUplatneniVysledku
n12:2015
n3:svazekPeriodika
46
n3:tvurceVysledku
Hradilová, Janka Blažek, Jan Hradil, David Šrein, Vladimír Němec, Ivan Čermáková, Zdeňka Bezdička, Petr
n3:wos
000349891900006
s:issn
0377-0486
s:numberOfPages
8
n18:doi
10.1002/jrs.4627
n11:organizacniJednotka
52810