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Browsing RM - Posters by Subject "Cerâmica"
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- Ancient Chinese blue-and-white porcelain glazes : can we measure the oxidation state of cobalt through X-ray absorption spectroscopy?Publication . Figueiredo, M. Ondina; Silva, Teresa; Veiga, JP
- Co and Cu K-edge XANES study of the glazed tiles from the Fronteira Palace (Lisbon, Portugal) [Poster]Publication . Coutinho, ML; Silva, Teresa; Figueiredo, Elin; Rolim, M.; Salas-Colera, Eduardo; Veiga, JPABSTRACT: The Fronteira Palace located in Lisbon was built during the second half of the seventeenth century. The Palace is known for its unique azulejos (Portuguese glazed tiles) dated from the 17th and 18th century which were profusely used both in the interior of the palace and on its magnificent formal gardens. The gardens have a unique cladding of high relief lustre tiles combined with blue-and-white tiles adorning the Gallery of the Kings (Figure 1). Samples of azulejos from Gallery of the Kings, were characterized in a previous work by PIXE. They display a silica alkali-lead glass or silica alkali glass and chromophores based on Co for the blue colouring and Cu for the red-lustre effect . In fact, the analyses showed that the colourless glaze has a lead-alkali silicate composition and a copper-rich lustre overlay, in agreement with the Manise lustreware production (Spain) after the XVII century. To achieve a comparison between manufacturing techniques and pigments used samples were characterized using X-Ray Absorption Spectroscopy. XANES techniques can provide information on the structural behaviour of transition metals in the vitreous matrix - namely, their bonding state and coordination environment, providing relevant information regarding the Co and Cu as chromophores.
- From ceramics and glasses to mortars and stones: using synchrotron radiation to study cultural heritage [Poster]Publication . Veiga, JP; Silva, Teresa; Coutinho, MLABSTRACT: The use of Synchrotron Radiation to study cultural heritage, either through objects with museum interest or materials from historical monuments is no longer a novelty. Advanced nondestructive characterization techniques to understand degradation phenomena, ageing mechanisms and ancient manufacturing techniques is now a well-established trend. Profiting from the properties of synchrotron radiation and using large scale facilities such as ESRF (European Synchrotron Radiation Facility, Grenoble, France), BESSY (Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung, Berlin, Germany) and former LURE (Laboratoire pour l’Utilization du Rayonement Synchrotron, Orsay, France), it was possible to study a great diversity of materials and objects of cultural value from different ages and provenances through X-rays. Synchrotron radiation sources available at these large-scale facilities provide powerful chemical and structural characterization tools such as micro X-ray fluorescence and X-ray absorption spectroscopies (XANES and EXAFS). Different case studies will be presented regarding the variety of materials studied by a group of Portuguese researchers from the past two decades (ceramics, glasses, inorganic pigments and lithologic materials).
- Non-destructive and micro-invasive techniques for cultural heritage diagnosis : a case study of glazed tiles from Portuguese historial buildings [Poster]Publication . Prudêncio, Maria Isabel; Silva, Teresa; Dias, Maria Isabel; Marques, José Gonçalves; Pereira, Marco A. Stanojev; Figueiredo, M. Ondina; Esteves, Lurdes; Albuquerque, Maria Beatriz; Botelho, Maria Luísa; Cabo Verde, Sandra I.; Trindade, Maria José; Burbidge, Christopher Ian; Marques, Rosa
- Speciation state of cobalt in blue glazes : a XAFS study on XVI cent. chinese blue-&-white porcelainsPublication . Figueiredo, M. Ondina; Silva, Teresa; Veiga, JP; Dias, M. Isabel
- Tile pathologies : green stains in blue-and-white glazes from an 18th century tile panel figuring LisbonPublication . Silva, Teresa; Figueiredo, M. Ondina; Prudêncio, Maria Isabel