Synchrotron radiation μ X-ray diffraction in transmission geometry for investigating the penetration depth of conservation treatments on cultural heritage stone materials
Articolo
Data di Pubblicazione:
2020
Citazione:
Synchrotron radiation μ X-ray diffraction in transmission geometry for investigating the penetration depth of conservation treatments on cultural heritage stone materials / E. Possenti, C. Conti, G.D. Gatta, M. Merlini, M. Realini, C. Colombo. - In: ANALYTICAL METHODS. - ISSN 1759-9660. - 12:12(2020 Mar 28), pp. 1587-1594. [10.1039/D0AY00010H]
Abstract:
The assessment of the penetration depth of conservation treatments applied to cultural heritage stone
materials is a burning issue in conservation science. Several analytical approaches have been proposed
but, at present, many of them are not fully exhaustive to define in a direct way the composition and
location of the conservation products formed after inorganic mineral treatments. Here, we explored, for
the first time, the analytical capability of synchrotron radiation m X-ray diffraction in transmission
geometry (SR-mTXRD) for the study of the crystal chemistry and penetration depth of the consolidating
phases formed after the application of diammonium hydrogen phosphate (DAP) treatments on a porous
carbonatic stone (Noto limestone). The SR-mTXRD approach provided unambiguous information on the
nature of the newly formed calcium phosphates (hydroxyapatite, HAP, and octacalcium phosphate, OCP)
with depth, supplying important indications of the diffusion mechanism and the reactivity of the
substrate. Qualitative and semi-quantitative data were obtained at the microscale with a non-destructive
protocol and an outstanding signal-to-noise ratio. The SR-mTXRD approach opens a new analytical
scenario for the investigation of a wide range of cultural heritage materials, including natural and artificial
stone materials, painted stratigraphies, metals, glasses and their decay products. Furthermore, it can
potentially be used to characterize the penetration depth of a phase “A” (or more crystalline phases) in
a matrix “B” also beyond the cultural heritage field, demonstrating the potential wide impact of the study.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Synchrotron radiation X-ray diffraction; conservation treatments; cultural heritage stone materials
Elenco autori:
E. Possenti, C. Conti, G.D. Gatta, M. Merlini, M. Realini, C. Colombo
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