title: X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects.
abstract: The crystal structure determination and refinement process of corrosion products on historic art objects using laboratory high-resolution X-ray powder diffraction (XRPD) is presented in detail via two case studies. The first material under investigation was sodium copper formate hydroxide oxide hydrate, Cu4Na4O(HCOO)8(OH)2∙4H2O (sample 1) which forms on soda glass/copper alloy composite historic objects (e.g., enamels) in museum collections, exposed to formaldehyde and formic acid emitted from wooden storage cabinets, adhesives, etc. This degradation phenomenon has recently been characterized as "glass induced metal corrosion". For the second case study, thecotrichite, Ca3(CH3COO)3Cl(NO3)2∙6H2O (sample 2), was chosen, which is an efflorescent salt forming needlelike crystallites on tiles and limestone objects which are stored in wooden cabinets and display cases. In this case, the wood acts as source for acetic acid which reacts with soluble chloride and nitrate salts from the artifact or its environment. The knowledge of the geometrical structure helps conservation science to better understand production and decay reactions and to allow for full quantitative analysis in the frequent case of mixtures.
authors.affiliation: Max-Planck-Institute for Solid State Research; r.dinnebier@fkf.mpg.de.
authors.forename: Robert E
authors.initials: RE
authors.lastname: Dinnebier
authors.affiliation: State Academy of Art and Design Stuttgart.
authors.forename: Andrea
authors.initials: A
authors.lastname: Fischer
authors.affiliation: State Academy of Art and Design Stuttgart.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Eggert
authors.affiliation: Max-Planck-Institute for Solid State Research.
authors.forename: Tomče
authors.initials: T
authors.lastname: Runčevski
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University.
authors.forename: Nanna
authors.initials: N
authors.lastname: Wahlberg
mesh_terms: D003343:Corrosion; D003460:Crystallization; D011208:Powders; D014961:X-Ray Diffraction
chemical_list: D011208:Powders