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These artifacts were characterized by micro-energy dispersive X-ray fluorescence spectrometry, optical microscopy, scanning electron microscopy with X-ray microanalysis, micro-X-ray diffraction and synchrotron radiation micro-X-ray diffraction. Cu<jats:sub>3<\/jats:sub>As is the expected intermetallic arsenide in arsenical copper alloys, reported in the literature as exhibiting a hexagonal crystallographic structure. However, a cubic Cu<jats:sub>3<\/jats:sub>As phase was identified by X-ray diffraction in all of our analyzed archaeological artifacts, while the hexagonal Cu<jats:sub>3<\/jats:sub>As phase was clearly identified only in the artifact with higher arsenic content. Occurrence of the cubic arsenide in these particular objects, suggests that it was precipitated due to long-term aging at room temperature, which points to the need of a redefinition of the Cu-As equilibrium phase constitution. These results highlight the importance of understanding the impact of structural aging for the assessment of original properties of archaeological arsenical copper artifacts, such as hardness or color.<\/jats:p>","DOI":"10.1017\/s1431927615015263","type":"journal-article","created":{"date-parts":[[2015,10,23]],"date-time":"2015-10-23T07:21:40Z","timestamp":1445584900000},"page":"1413-1419","source":"Crossref","is-referenced-by-count":9,"title":["Effects of Long-Term Aging in Arsenical Copper Alloys"],"prefix":"10.1093","volume":"21","author":[{"given":"Filipa","family":"Pereira","sequence":"first","affiliation":[]},{"given":"Rui J. C.","family":"Silva","sequence":"additional","affiliation":[]},{"given":"Ant\u00f3nio M.","family":"Monge Soares","sequence":"additional","affiliation":[]},{"given":"Maria F.","family":"Ara\u00fajo","sequence":"additional","affiliation":[]},{"given":"Maria J.","family":"Oliveira","sequence":"additional","affiliation":[]},{"given":"Rui M. 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