Thermal behaviour of limestone and monocrystalline calcite tempers during firing and their use in ancient vessels

Shoval, S.; Gaft, M.; Beck, P.; Kirsh, Yoram

doi:10.1007/bf02546577

Cited by 89 publications

(54 citation statements)

References 9 publications

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“…A higher firing, at 700-750°C, has been recorded by the structural breakdown of smectite and the small amount of undecomposed primary calcite (up to 3 wt%) in samples KA2-4 and KA3-2 (Shoval et al 1993;Murad and Wagner 1998). In contrast, for sample KA1-6 its optically inactive micromass, the preservation of white mica (illite/muscovite) and the neocrystallization of high-T minerals, such as clinopyroxene (diopside, 11.9 wt%), melilite (gehlenite, 2.4 wt%), and hercynite spinel (5.0 wt%), indicates a higher temperature, 850-900°C (Figure 4…”

Section: A Katerini (Kilns Ka1 Ka2 Ka3): Estimated Firing 400-900°cmentioning

confidence: 96%

An Archaeometric and Archaeological Approach to Hellenistic-Early Roman Ceramic Workshops in Greece: Contribution to Dating

et al. 2014

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The present article comprises a multidisciplinary archaeometric approach for the study of Hellenistic and Early Roman kilns in Greece. A collection of previously published and new archaeomagnetic data are combined with new results from mineralogical analytical experiments. The sampled material came from four areas, covering different geological contexts: Katerini, Olympiada, and Polymylos in mainland Greece, and the island of Paros. Extensive rock-magnetic experiments, including identification of the dominant ferromagnetic minerals present, their domain state, and mineralogical alterations during laboratory treatments, have been carried out in order to examine the magnetic properties of the studied materials and prove their suitability for reliable archaeomagnetic determinations. Magnetic cleaning provided well-defined archaeomagnetic directions, and archaeointensity measurements were carried out using both the Thellier-Thellier and Triaxe protocols. Information from both magnetic and mineralogical properties referring to firing conditions is further discussed along with archaeological information. Finally, a new dating of the four sites together with other structures of similar age was carried out using the Pavón-Carrasco model.

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Section: A Katerini (Kilns Ka1 Ka2 Ka3): Estimated Firing 400-900°cmentioning

confidence: 96%

An Archaeometric and Archaeological Approach to Hellenistic-Early Roman Ceramic Workshops in Greece: Contribution to Dating

et al. 2014

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“…2), indicating changes in their arrangement. A sharp, strong peak at 3643 cm -I is due to the OH stretching vibrations of calcium hydroxyde [10], which is formed by the reaction of CaO with atmospheric water vapor [ 11 ]. Vibration bands at 745 cm -I of the P-O-P bridge bonds [1] are observed with dif- Wavenumbe~ (era-l) Fig.…”

Section: Changes In Phosphoritementioning

confidence: 98%

Thermal transformations in phosphorites

Knubovets

Nathan

Shoval

et al. 1997

Journal of Thermal Analysis

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The thermal transformations in phosphorites during flash calcination were investigated by FT-IR spectroscopy, X-ray diffraction and chemical analyses. During flash calcination changes occur, both in the composition of the phosphorite and in the crystallochemistry of the fluor-carbonate-apatite (francolite). The former changes include: decomposition of a great part of the calcite in the rock and oxidation of organic matter. The latter changes include: partial removal of the structural carbonate; partial relocation of the remaining carbonate ions in the apatite structure; a new arrangement of hydroxyl groups and fluorine on the hexagonal axis; partial condensation of the orthophosphate groups and increase of crystallite sizes. Isomorphous substitution ofPO43 in apatite by SO42 and SiO44 may take place.

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“…rate of heat evolution) and pressure of the environment. Many researchers have studied the kinetics of thermal decomposition of carbonate minerals (Powell and Searcy 1980;Warne et al 1981;Iwafuchi et al 1983;Borgwardt 1985;Yariv 1989;McInosh et al 1990;Rubiera et al 1991;McCauley and Johnson 1991;Mulokozi and Lugwisha 1992;Ersoy-Merichoyu et al 1993;Shoval et al 1993;Xiao et al 1997). A general review of the literature on the decomposition of carbonates indicates that a great deal of variability exists in the reported values of the decomposition temperatures, activation energies and rates of decomposition.…”

Section: Introductionmentioning

confidence: 95%

Thermal decomposition of natural dolomite

Gunasekaran¹,

Anbalagan

2007

Bull Mater Sci

190

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Thermal decomposition behaviour of dolomite sample has been studied by thermogravimetric (TG) measurements. Differential thermal analysis (DTA) curve of dolomite shows two peaks at 777⋅8°C and 834°C. The two endothermic peaks observed in dolomite are essentially due to decarbonation of dolomite and calcite, respectively. The TG data of the decomposition steps have also been analysed using various differential, difference-differential and integral methods, viz. Freeman-Carroll, Horowitz-Metzger, Coats-Redfern methods. Values of activation entropy, Arrhenius factor, and order of reaction have been approximated and compared. Measured activation energies vary between 97 and 147 kJ mol -1 . The large fluctuation in activation energy is attributed to the presence of impurities such as SiO 2 , Al 2 O 3 , Fe 2 O 3 , Cl -etc in the samples. FTIR and XRD analyses confirm the decomposition reaction. SEM observation of the heat-treated samples at 950°C shows cluster of grains, indicating the structural transformation.

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Thermal behaviour of limestone and monocrystalline calcite tempers during firing and their use in ancient vessels

Cited by 89 publications

References 9 publications

An Archaeometric and Archaeological Approach to Hellenistic-Early Roman Ceramic Workshops in Greece: Contribution to Dating

An Archaeometric and Archaeological Approach to Hellenistic-Early Roman Ceramic Workshops in Greece: Contribution to Dating

Thermal transformations in phosphorites

Thermal decomposition of natural dolomite

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