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Hydrolysis of ceramic materials: neoformation or rehydroxylation of clay minerals. Oxygen stable isotope analysis

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Abstract:

Hand-made bricks were manufactured from natural sediments by firing at 700°C and 800°C after which they were hydrothermally altered at 150°C in a high-pressure reactor for 1200 h. Sediments and fired pieces were studied by X-ray diffraction. The <2 µm size-fraction of fired and hydrolysed samples were also studied by X-ray diffraction and oxygen isotope analysis. The oxygen isotope composition of the samples became depleted in 18O by alteration. Our results are consistent with a process of hydration and hydroxylation of the partially destroyed clay minerals in the fired bricks. The work is relevant to understanding the origins and alteration processes in old ceramic materials.

Keywords: CLAY MINERALS; OXYGEN; REHYDROXYLATION; STABLE ISOTOPES

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/0009855023720038

Publication date: June 1, 2002

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minsoc/cm/2002/00000037/00000002/art00011
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