LUSTRE COLOUR AND SHINE FROM THE OLLERIES XIQUES WORKSHOP IN PATERNA (SPAIN), 13TH CENTURY AD: NANOSTRUCTURE, CHEMICAL COMPOSITION AND ANNEALING CONDITIONS

Autor: J. Portillo, Josefina Pérez-Arantegui, Josep Roqué, M. Vendrell-Saz, C. Calabuig, Judit Molera
Rok vydání: 2007
Předmět:
Zdroj: Archaeometry. 49:511-528
ISSN: 1475-4754
0003-813X
DOI: 10.1111/j.1475-4754.2007.00317.x
Popis: Lustre is a medieval ceramic decoration, corresponding to a nanostructured thin layer formed by metallic copper and silver nanocrystals embedded in a glass matrix, which required deep knowledge on the part of the artisans with regard to the raw materials used and the kiln conditions. Their empirical knowledge led to the achievement of colourful lustre decorations ranging from reddish to yellowish or even greenish, some of them with a metallic shine with an associated purplish iridescence. Lustre ceramics dating from the 13th century from the Olleries Xiques workshop in Paterna (Spain) have been studied, linking their chemical composition and nanostructure with their colours and shine. Two kinds of nanostructures are found, yellowish lustre decoration constituted by a silver metal-glass nanocomposite, and reddish lustre decoration constituted by metallic copper nanocrystals and copper oxide nanocrystals; in some cases, metallic copper nanocrystals covered with an oxidized shell of CuO and partly Cu 2 O have been found. However, even with significant amounts of copper oxide, the lustre still exhibits a copper metal-like shine. The bluish iridescence observed at a specular angle in the lustre could not be explained completely by means of the chemical composition, and metallic silver nanoparticle light scattering is proposed as a possible explanation.
Databáze: OpenAIRE
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