This proposal aims at implementing a new access route to the ESRF structural analysis capacities for the Heritage Science community. The upgrade to the ESRF-EBS was the triggering element to propose a single block allocation group (BAG). After discussion with multiple interested research teams, it was decided to target two complementary analytical configurations at the ESRF: High angular resolution XRD (ID22) and High lateral resolution XRD (ID13). The combination of these two beamlines generates precious clues on the origin, processing and degradation of historical materials. The new analytical capacities of the EBS, combined with an optimized access route is expected to increase the output of the Cultural Heritage community, to reinforce a scientific network of expert users structured around the ESRF, and to initiate new European collaborations in Heritage Science.
The degradation phenomena of cadmium red (CdS1-xSex) oil paint pigments is a process that starts from the surface. We wish to study this process with a depth-selective method by using Se K-edge XAFS spectroscopy and comparing data collected simultaneously in X-ray fluorescence Yield (FY) and total electron yield (TEY) detection modes. We intend to determine the oxidation state, coordination numbers and interatomic distances of Se-compounds. These analyses will permit to define how some intrinsic properties of the pigment (crystal defects/Se content) and environmental agents influence Se speciation within cadmium red paints.
The objective of the current proposal is to carry out similar investigations on black and white porcelains which were produced in large quantity but from local raw materials and mainly intended for local markets. These productions are an interesting example of manufacturing fine objects from inexpensive materials of variable quality. The rather complex and heterogeneous microstructure of decors, coming from the use of weakly refined materials, is an invaluable source of information concerning the manufacturing processes. Moreover, these productions were not managed by the central power such as more prestigious productions; their study is also a good an appropriate way to investigate the local traditions and specifically to study how craftsmen were able to take advantage of their local resource. In order to analyse the entire complex structure of those porcelains, we propose to perform hierarchical imagings by scanning X-ray microscope on ID21 of a selection of samples.