Thermal and mineralogical contribution to the ancient ceramics and natural clays characterization

Papadopoulou, Despina; Lalia‐Kantouri, Maria; Kantiranis, Nikolaos; Stratis, J. A.

doi:10.1007/s10973-005-7173-y

Cited by 56 publications

(32 citation statements)

References 20 publications

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“…The determination of these elements is related to the raw material and can be successfully used for the classification of the ceramics into groups of similar compositions [3]. The mineralogical analysis of the ceramics gives information about their firing conditions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of some archaeological ceramics and clay samples from Zamala - Far-northern part of Cameroon (West Central Africa)

et al. 2017

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Seventeen ceramics samples (515±95 BP, about 580 years old) and two clay raw materials from Zamala (Far-northern, Cameroon) were characterized by X-ray diffraction (XRD), thermal analysis (DTA/TG) and X-ray fluorescence spectroscopy. The aim of the work was the deduction of the production technology and provenance of these ceramics. With the exception of one sample the analysed ceramics formed a homogeneous chemical and mineralogical group. The observed mineralogical phases were quartz, mica (biotite), potassium feldspar (microcline) and plagioclase (albite and oligoclase). The XRD study of two local clays yielded the presence of quartz, kaolinite, mica, feldspar and plagioclase. The presence of the broad endothermic peak in the DTA/TG curves of the clays and its absence in the curves of the ceramics indicated that the firing temperature of the ceramics was above 550-600 °C, which is the temperature of the kaolinite-metakaolinite transformation. The firing experiments of the clay between 400-1200 °C in oxidizing atmosphere showed that mica disappeared above 900 °C. Therefore, the firing temperature of the sherds should have been between 600-900 °C. The chemical correlation between ceramics and local clay materials pointed out to a local production of these ceramics. Keywords: Zamala, Cameroon, archaeological ceramics, clays, characterization, production technology, provenance. Resumo Dezessete amostras de cerâmica (515±95 AP, cerca de 1435 d.C.) e duas argilas de Zamala (Extremo Norte, Camarões) foram caracterizadas por difração de raios X (DRX), análise térmica (DTA/TG) e espectroscopia de fluorescência de raios X. O objetivo do trabalho foi a dedução da tecnologia de produção e proveniência dessas cerâmicas. Com exceção de uma amostra, as cerâmicas analisadas formaram um grupo químico e mineralógico homogêneo. As fases mineralógicas observadas foram quartzo, mica (biotita), feldspato de potássio (microclínio) e plagioclásio (albita e oligoclásio

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Section: Introductionmentioning

confidence: 99%

Characterization of some archaeological ceramics and clay samples from Zamala - Far-northern part of Cameroon (West Central Africa)

et al. 2017

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“…The existence of mullite [Al (4 þ 2x) Si (2À2x) -O (10 À x) , where x from 0.17 to 0.59] at temperatures higher than 1000 C denoted the kaolinite presence in the GM and CB samples. Plagioclase, quartz and hematite are fire-resistant minerals and, therefore, remained unchanged during the heat treatment [17]. The presence of amorphous phases in the heated samples is clearly indicated by the background hump, which approximately appeared between 10 and 18 in the X-ray diffraction patterns.…”

Section: Heat Treatmentmentioning

confidence: 99%

“…The presence of amorphous phases in the heated samples is clearly indicated by the background hump, which approximately appeared between 10 and 18 in the X-ray diffraction patterns. This amorphous phase is probably the result of sintering of the initial constituents of clays during the firing process [17].…”

Section: Heat Treatmentmentioning

confidence: 99%

Chemical characterization of Cretan clays for the design of restoration mortars

Budak

Maravelaki-Kalaitzaki

2008

Microchim Acta

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“…X-ray powder diffraction (XRPD) is extensively used to characterise ancient pottery in terms of mineralogical composition, and also to constrain the production technology, with particular focus on the raw materials used and the firing conditions, mainly temperature and firing atmosphere (Bimson, 1969;Heimann and Franklin, 1972;Grattan-Bellew and Litvan, 1978;Maggetti, 1982;Martin-Socas et al, 1989;Philpotts and Wilson, 1994;Tite, 1995;Maritan, 2004;Nodari et al, 2004;Papadopoulou et al, 2006;Prudêncio et al, 2006;Prudêncio et al, 2009;Charalambous et al, 2010;Velraj et al, 2010;Mangueira et al, 2011;Maritan et al, 2013). Possible post-depositional alteration processes can also be identified and characterised (Heimann and Maggetti, 1981;Maggetti et al, 1984;Pradell et al, 1996;Buxeda i Garrigós, 1999;Buxeda i Garrigós et al, 2001;Maritan and Mazzoli, 2004;Buxeda i Garrigós et al, 2005;Schwedt et al, 2006;Secco et al, 2011).…”

Section: Introductionmentioning

confidence: 99%