Mineralogy and firing characteristics of a clay from the valley of Ourika (Morocco)

Hajjaji, M.; Kacim, S.; Boulmane, Mohamed

doi:10.1016/s0169-1317(01)00101-6

Cited by 90 publications

(43 citation statements)

References 13 publications

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“…Endothermic peak between RT-200 °C corresponded to the loss of hygroscopic water in the clay [37,38]. The DTA curve showed a distinct endothermic peak starting around 450 °C accompanied by a loss of mass of 2.45%; it corresponded to the dehydroxylation of kaolinite to metakaolinite [39]. This result was in agreement with the X-ray diffraction of the fired clays.…”

Section: Ceramicssupporting

confidence: 85%

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: Ceramicssupporting

confidence: 85%

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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“…So the broad exothermic band found in the range of temperature 250-500 °C in the characteristic DTA curves of Nedunkur samples represent combustion of organic materials present in the clay of potteries. The endothermic peak appearing near the temperature 600 °C is attributed to the decomposition of kaolinite [8]. So, the decomposition of kaolinite was evidenced by the appearance of endothermic peak in all the Nedunkur sherds very close to 600 °C respectively.…”

Section: Resultsmentioning

confidence: 89%

Thermal characterization of archaeological pot sherds recently excavated in Nedunkur, Tamilnadu, India

2012

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The archaeological pottery sherds excavated recently in Nedunkur, Tamilnadu, were analysed using Thermogravimetric (TG) and Differential Thermal analysis (DTA) with an objective of identifying the mineralogical characteristics of the raw materials used for their production. Besides, the thermal reactions associated over the linear temperature ramp from room temperature to 1200 °C in an inert atmosphere were also realized by TG-DTA. The characterization studies were able to indicate the conditions of firing process adopted and firing temperature attained by the artisans at the time of manufacture. Keywords: archaeological pottery, firing temperature and TG-DTA. Resumo Os fragmentos cerâmicos arqueológicos escavados recentemente em Nedunkur, Tamilnadu, foram examindos usando análise termogravimétrica (TG) e análise térmica diferencial (ATD) com a finalidade de identificar as características mineralógicas dos

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“…Assim, o conhecimento das características das argilas não tem valor apenas acadêmico, mas também grande interesse comercial [12]. Essa preocupação com a adequada caracterização de argilas para aplicação em cerâmica vermelha e seu reflexo na produtividade e qualidade dos produtos finais se manifesta em todo o mundo [13][14][15][16][17], a cada dia de forma mais intensa. Assim, esse trabalho tem por objetivo a caracterização física e mineralógica de argilas utilizadas industrialmente para a produção de blocos cerâmicos, visando avaliar sua adequação a esse processo cerâmico.…”

Section: Introductionunclassified

Estudo de argilas usadas em cerâmica vermelha

et al. 2008

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ResumoEste trabalho tem por objetivo a caracterização física e mineralógica de argilas utilizadas industrialmente para a produção de blocos cerâmicos. As argilas foram caracterizadas por meio da determinação de distribuição granulométrica, limites de Atterberg e composição química, difração de raios X, e análise térmica diferencial e gravimétrica. Foram conformados corpos de prova por extrusão. Os corpos foram queimados a 800, 900 e 1000 o C e em seguida determinou-se absorção de água e módulo de ruptura à flexão. Também foram determinadas a absorção de água e a resistência à compressão simples de blocos cerâmicos comerciais produzidos com as amostras analisadas. Pode-se observar que as amostras apresentam limites de plasticidade dentro da faixa indicada para cerâmica vermelha e que são constituídas basicamente por caulinita, quartzo, mica e feldspatos, com algumas amostras apresentando goetita e hidróxido sílico-aluminoso. Concluiu-se também que a caracterização permite estimar as argilas adequadas ou não para a produção de blocos cerâmicos. Palavras-chave: argilas, blocos cerâmicos, cerâmica vermelha, caracterização. Abstract The aim of this work was to characterize clays industrially used for the production of ceramic bricks. The clays were characterizedThe clays

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Mineralogy and firing characteristics of a clay from the valley of Ourika (Morocco)

Cited by 90 publications

References 13 publications

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

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

Thermal characterization of archaeological pot sherds recently excavated in Nedunkur, Tamilnadu, India

Estudo de argilas usadas em cerâmica vermelha

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