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- An approach to the binding state of indium in natural chalcogenides through the analysis of In L3 edge XANES spectraPublication . Silva, Teresa; de Oliveira, Daniel Pipa Soares; Veiga, JP; Rosa, Diogo; Figueiredo, M. OndinaA study using synchrotron radiation X-ray absorption spectroscopy at In L3-edge is presented, as a contribution to interpret the binding state of indium in natural chalcogenides considering the increase of applications of this scarce metal.
- 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.
- Contribuição para o conhecimento de formações lateríticas da Guiné-BissauPublication . Alves, Paulo; Silva, Teresa; Figueiredo, M. Ondina; Ramalhal, Fernando J. S.
- Enhancing Resilience of Hot Spring Ecosystems Towards a Model of Sustainable Management of SPA Territories, Driving Innovation and Energy transition [Poster]Publication . Bertin, C.; Iasio, C.; Herms, Ignasi; Arnó, Georgina; Carvalho, João; Ramalho, Elsa; Becerra, S.; Roussel, M.; Brut, E.ABSTRACT: The climate observation systems have classified 2020, 2022, 2019, 2015, and 2014 as the five hottest years in Europe over the past four decades. In the SUDOE region, 2022 was the warmest year since 1950. The projected long-term decline in precipitation in the SUDOE region may alter the natural properties of thermal springs, by changes in of shallow and deep groundwater mixing, impacting their anthropogenic ecosystem. Currently, there is no data assessing the impact of climate change, nor is there any adaptation strategy in place to anticipate its socio-economic consequences. Data on groundwater quality, climate change vulnerability, and territorial adaptive capacity are heterogeneous, exacerbating the economic divide. Migration movements and indirect impacts of climate change, as such as pandemic crises, may further intensify stress on water resources and the economy.
- 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).
- How metallic is the binding state of indium hosted by excess-metal chalcogenides in ore deposits [Poster]Publication . Figueiredo, M. Ondina; Silva, Teresa; de Oliveira, Daniel Pipa Soares; Rosa, Diogo
- Indium crystal chemistry : from thin-fill materials to natural bulk chalcogenidesPublication . Figueiredo, M. Ondina; Silva, Teresa
- Influence of the large cation upon pre-edge details of Fe 1s XANES spectra in jarosite-type sulphate mineralsPublication . Figueiredo, M. Ondina; Silva, Teresa
- Lateritos da Guiné-Bissau : morfologia e geodiversidadePublication . Alves, Paulo; Silva, Teresa; Figueiredo, M. Ondina; Ramalhal, Fernando J. S.