0442179 20240103205843.520150724235959.9 84937107577 000350939200012 10.1016/j.saa.2014.12.082 10 s. cav_un_epca*02551171386-1425140101-110Elsevier Degradation High-temperature X-ray diffraction Model experiments Mossbauer spectroscopy Vivianite cav_un_auth*0287834 Akademická laboratoř materiálového průzkumu malířských děl (ALMA) Academic Materials Research Laboratory of Painted Artworks (ALMA) ALMA ALMA Academic Laboratory of Material Research of Painted Artworks Čermáková Zdeňka UACH-T CZ Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0245241 Akademická laboratoř materiálového průzkumu malířských děl (ALMA) Academic Materials Research Laboratory of Painted Artworks (ALMA) ALMA ALMA Academic Laboratory of Material Research of Painted Artworks Švarcová Silvie UACH-T Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0243727 Hradilová J. CZ cav_un_auth*0102644 Akademická laboratoř materiálového průzkumu malířských děl (ALMA) Academic Materials Research Laboratory of Painted Artworks (ALMA) ALMA ALMA Academic Laboratory of Material Research of Painted Artworks Bezdička Petr UACH-T CZ Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0102684 Centrum instrumentálních technik Centre of Instrumental Techniques CIT CIT Lančok Adriana UACH-T Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0299820 Vašutová V. CZ cav_un_auth*0254045 Zpracování obrazové informace Department of Image Processing ZOI ZOI Department of Image Processing Blažek Jan UTIA-B Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0102665 Akademická laboratoř materiálového průzkumu malířských děl (ALMA) Academic Materials Research Laboratory of Painted Artworks (ALMA) ALMA ALMA Academic Laboratory of Material Research of Painted Artworks Hradil David UACH-T CZ Ústav anorganické chemie AV ČR, v. v. i. cav_un_auth*0285028 GAP103/12/2211 GA ČR Temperature-related degradation of pure synthetic as well as partly oxidised natural vivianite has been studied by high-temperature X-ray diffraction (HT-XRD) covering the whole extent of the temperature-related stability of its structure. While temperatures around 70°C are already damaging to vivianite, exposition to 160°C results in complete amorphisation of both the vivianite and its oxidation products. As indicated by Mossbauer spectroscopy, temperature-induced oxidation of vivianite starts at 90°C. To study the occurring structural as well as accompanying colour changes in more detail, model vivianite paint layer samples with different historic binders were prepared and subjected to increased temperatures. Exposition to 80°C caused pronounced colour changes of all the samples: ground natural blue vivianite became grey - a colour change which has been described in actual works of art. Regarding the binders, the oil seemed to facilitate the transfer of heat to vivianite's grains. To simulate conditions of conservation treatment under which the painting is exposed to increased temperatures, oil-on-canvas mock-ups with vivianite were prepared and relined in a traditional way using iron. The treatment affected preferentially larger grains of vivianite; the micro-samples documented their change to grey, and their Raman spectra showed the change from vivianite to metavivianite. CA 10000 10400 10402 2016 4 A hod 4ah 20231122140854.5 RVO:61388980 RVO:67985556 http://hdl.handle.net/11104/0245068 1 Academic Laboratory of Material Research of Painted Artworks UACH-T 10406 CHEMISTRY, ANALYTICAL S RIV/61388980:_____/15:00442179!RIV16-AV0-61388980 191955405 oprava ISSN UACH-T RIV/67985556:_____/15:00442179!RIV16-AV0-67985556 191955522 oprava ISSN UTIA-B RIV/67985556:_____/15:00442179!RIV16-GA0-67985556 191953672 oprava ISSN UTIA-B SPECTROSCOPY 2.582 0.954 4.6 0.02755 0.373 24233 0.709 Q1 1.984 1615 Q2 44.664 70.9 Q3 Q2 70.93 2015 Soubory v repozitáři: 0442179.pdf 84937107577 SCOPUS 25589392 PUBMED 000350939200012 WOS cav_un_epca*0255117 Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy 1386-1425 1873-3557 Roč. 140 APR 2015 101 110 Elsevier