Sourcing and nuclear magnetic resonance: new applications for old materials
Résumé
Solid-state nuclear magnetic resonance, which enables the characterization of structures of a variety of materials whatever their crystallinity/amorphous state, is used in the present work to determine the provenance of two raw materials, namely marbles and cherts. Regarding marbles, the 13 C NMR signal of the carbonate function contains information about both the Fe content in its area and the presence of calcium substitutions in the calcite crystal in its linewidth. Regarding cherts, discriminant information is provided by both 29 Si and 27 Al NMR: the 29 Si area signal depends on the paramagnetic ion content of the material, and the 27 Al spectra give information both on the aluminosilicate content and its distribution in tecto-and layer-lattice aluminosilicates. As an application, we use the differences observed from one source to another to determine the provenance of archaeological finds.
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