Artefacts from Ban Chiang, Thailand: pottery with hematite-red geometric patterns

2020 ◽  
Vol 235 (11) ◽  
pp. 559-568
Author(s):  
Ulrich Bismayer ◽  
Sutham Srilomsak ◽  
Yaowapa Treekamol ◽  
Waraporn Tanthanuch ◽  
Kanokwalee Suriyatham
Keyword(s):  
Ftir Spectroscopy ◽  
Bronze Age ◽  
Iron Age ◽  
Powder Diffraction ◽  
Mineralogical Composition ◽  
Optical Reflectance ◽  
Thin Sections ◽  
X Ray ◽  
Geometric Patterns ◽  
Ban Chiang

AbstractBan Chiang () is an extensively studied archeological site in Northeast Thailand, Udon Thani Province, which became a UNESCO world heritage in 1992. Depending on their production period ceramic artefacts show characteristic patterns at the surface which may be interpreted as iconographic motifs for the site. Two ceramic samples, excavated in 2003, from different periods were re-investigated, previously studied by Tanthanuch W., Pattanasiriwisawa W., Somphon W., Srilomsak S. Synchrotron studies of Ban Chiang ancient pottery. Suranaree J. Sci Technol. 2011, 18, 15–28 who focussed on thermal firing and redox-conditions. Shards selected for this study were sample 5412-S6E15 dated from Bronze Age (ca. 1000–300 BC) with yellow-brown, paint-free surface and a younger sample 8027 from Iron Age (ca. 300 BC–200 AD) with red painted design carrying pictorial patterns typical for the Ban Chiang ceramics. The surface material and colour of both shards was studied in detail using optical reflectance, FTIR spectroscopy and X-ray powder diffraction. Thin sections were used to determine the thickness of the red paint and the elemental composition of the surface using an electron microprobe. Chemical composition of sample 5412-S6E15 consists as oxides of elements mainly of SiO2 and Al2O3 (representing ca. 59 and 20 wt. %) and that of the red colour of the youngest sample 8027 consists mainly of SiO2, Al2O3 and Fe2O3 (representing ca. 52, 13 and 13 wt. %), the average composition adjacent to the red painted area has ca. 72 wt. % SiO2, ca. 10 wt. % Al2O3 and only 2 wt. % Fe2O3. X-ray powder diffraction, FTIR spectroscopy and optical reflectance measurements confirm hematite in the mineralogical composition of the red pigment of shard 8027.

Chemical Interaction of Phosphates MII2P4O12 with Melted MICl or MINO3 (MI – Li, Na, K; MII – Mg, Co, Ni, Zn)

2015 ◽  
Vol 230 ◽  
pp. 297-302 ◽  
Author(s):  
Oksana V. Livitska ◽  
Nataliya Yu. Strutynska ◽  
Igor V. Zatovsky ◽  
Nikolay S. Slobodyanik
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ftir Spectroscopy ◽  
Powder Diffraction ◽  
Diffuse Reflectance ◽  
Chemical Interaction ◽  
Crystalline Phases ◽  
X Ray ◽  
Temperature Range ◽  
Scanning Electron

The interaction in the systemsMII2P4O12-MICl (MINO3) (MI– Li, Na, K;MII– Mg, Co, Ni, Zn) was investigated in temperature range 1073-673 K. The conditions of formation phosphates: Li3PO4,MIMIIPO4(MI– Na, K), Na4MII3(PO4)2P2O7, Na9Co3(PO4)5have been established. Obtained crystalline phases have been investigated using X-ray powder diffraction, Diffuse reflectance, Raman and FTIR spectroscopy and scanning electron microscopy methods.

scholarly journals Portable XRF on Prehistoric Bronze Artefacts: Limitations and Use for the Detection of Bronze Age Metal Workshops

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Heide Wrobel Nørgaard
Keyword(s):  
Bronze Age ◽  
Chemical Processes ◽  
Portable Xrf ◽  
Data Set ◽  
Thin Sections ◽  
Tin Alloys ◽  
X Ray ◽  
Metal Composition ◽  
Non Destructive ◽  
Xrf Analyses

AbstractTwo different scientific analyses-one destructive and one non-destructive-were conducted on two separate groups of bronze ornaments dating from 1500-1100 BC to investigate, amongst other traits, the metal composition of their copper-tin alloys. One group of artefacts was sampled, and polished thin sections were analysed using a scanning electron microscope (SEM). Results from the corrosion crust of copper-tin alloys, and the change measured within the elemental composition from the bulk metal to the surface, greatly influenced the interpretation of the second data set, which was measured using a handheld X-ray fluorescence (XRF) device. The surface of corroded bronze ornaments consists mostly of copper carbonates, oxides, and chlorides. Chemical processes, such as decuprification, change the element composition in such a manner that the original alloy cannot be traced with a non-destructive method. This paper compares the results of both investigations in order to define the possibilities and limits of non-destructive XRF analyses of corroded bronze artefacts.

Effect of Pair-Mineralizer on the Reaction of Alite and Calcium Langbeinite Formation

2006 ◽  
Vol 510-511 ◽  
pp. 622-625
Author(s):  
Woo Teck Kwon ◽  
Young Phil Kim ◽  
Y. Kim ◽  
Soo Ryong Kim ◽  
Seong Youl Bae
Keyword(s):  
Powder Diffraction ◽  
Calcium Silicate ◽  
Mineralogical Composition ◽  
Experimental Results ◽  
Silicate Minerals ◽  
X Ray

This paper investigates the effect of the pair-minerializer (CaSO4,-CaF2) on the reaction of alite, belite and calcium langbeinite formation with different alkali and sulfate contents. A set of clinker samples was prepared by adding laboratory grade reagents of (NH4)2SO4, CaF2 and K2CO3 to the cement raw mixes. The mineralogical composition of clinker was analyzed by X-ray powder diffraction, and the quantity of minerals was evaluated by using TOPAS software. As the experimental results, the total amount of calcium silicate minerals was rapidly increased with the addition of F and SO3 components simultaneously as pair-mineralizer with K2O more than the value which mineralizer was added separately. Also, in the case of adding K2O only to the raw mixes, the amount of alite is decreased after clinkering. However, if alkali (K2O) and pair-minerializer (CaSO4,-CaF2) were added simultaneously, the quantity of alite and calcium langbeinite mineral increased because of the formation of stable clinker minerals by the reaction of alkali (K2O) and sulfate.

scholarly journals Archaeometrical Characterization of Romanian Late Bronze Age Ceramic Fragments

2021 ◽  
Vol 8 ◽  
Author(s):  
Irina Fierascu ◽  
Anda Maria Baroi ◽  
Roxana Ioana Brazdis ◽  
Toma Fistos ◽  
Cristian Andi Nicolae ◽  
...  
Keyword(s):  
Bronze Age ◽  
Raw Materials ◽  
Technological Development ◽  
Relative Concentration ◽  
Mineralogical Composition ◽  
Analytical Investigation ◽  
Late Bronze Age ◽  
Quartz Content ◽  
Analytical Methodology ◽  
X Ray

Knowledge of the past can provide information to protect the future and the potential of the technological development in the analytical sciences can be successfully applied for the study and conservation of cultural objects. In this context, in the present paper we propose an analytical methodology to characterize seven samples of ancient ceramic objects (dating to the Late Bronze Age). The samples were analyzed using optical microscopy, and all the samples presented a strong inhomogeneity on the surface, as suggested by the different colors of the ceramics. X-ray fluorescence (XRF) results reveal a relatively heterogenous composition of the samples, as well as strong differences between the different surfaces of each sample. By comparative analysis of the diffractograms recorded for both sides of the same samples were observed some differences, especially in terms of relative concentration of the component minerals, and, in lesser content, in terms of new phases present in the samples. Corroborated results obtained by XRF and X-ray diffraction (XRD) offered information regarding mineralogical composition of the samples: for some of them illite/muscovite and plagioclase phases are present in higher quantities or a lower quartz content. The presence of these components was confirmed by Fourier-transform infrared spectroscopy (FTIR) analysis. The thermal analysis completes the analytical investigation of the ceramic samples. The thermal behavior of the sample conducted to some explanation regarding the observed differences, due to the raw materials (that the major clay mineral in the samples is represented by illite) or to environmental factors during their burial in the soil.

scholarly journals METHODS OF NATURAL SCIENCES IN THE STUDY OF ANCIENT CERAMICS (Transition Time from the Bronze Epoch to the Early Age. South Western Siberian Plain)

2018 ◽  
Vol 27 (2) ◽  
pp. 375-385
Author(s):  
V. I. Molodin ◽  
L. N. Mylnikova
Keyword(s):  
Bronze Age ◽  
Iron Age ◽  
Northern Taiga ◽  
Southern Taiga ◽  
Natural Sciences ◽  
Transition Time ◽  
Early Iron Age ◽  
Forest Steppe ◽  
Thermal Methods ◽  
X Ray

The article publishes the results of studying the molding masses and the quality of firing ceramic vessels of the Linevo 1 site (transition time from the Bronze Age to the Early Iron Age). The research was carried out using the methods of natural sciences: petrographic, X-ray phase and thermal. Five groups of ceramics were identified in the ceramic complex of the site. The second — Late Irmenskaya culture is a continuation development of the autochthonous — Irmenskaya. Three others: Molchanovskaya, Samodelkinskaya and with features of the early Iron Age — are imported. Within the framework of one site Linevo 1, there were recorded the existence of two traditions of making molding masses: chamotte and granitoid. The second tradition has been singled out both for the Molchanovskaya ceramic group and for the Samodelkino group but they differ in the composition of rock fragments. It was calculated that most of the collection is made up of «transitional» forms, «forms of imitation». There are no identical or closely related products in terms of morphological features in the collection. Syncretism of the complex under consideration is evidence of the complex ethno-cultural composition of the inhabitants of the ancient settlement. It can be clearly traced as a local autochthonous component that grows on the Irmenskaya culture basis and the northern taiga, coming to the forest-steppe most likely from the southern taiga of the Ob River. Obviously the fifth group of ceramics is foreign. As for the Linevo settlement complex it generally confirms the tendency of the joint existence of various ceramic traditions of the forest-steppe, steppe and taiga circle of cultures already noted for the cultures of the transitional time of the West Siberian forest-steppe with the predominance of the Irmenskaya culture — Late Irmenskaya culture component. All the results obtained are objective in nature, since they are based not on visual definitions, but on petrographic, X-ray phase, thermal methods and mathematical miscalculations.

X-ray powder diffraction of mineral pigments and medicines from the 17th century pharmacy (Spezieria) Santa Maria della Scala in Rome, Italy

2018 ◽  
Vol 33 (4) ◽  
pp. 270-278
Author(s):  
Giovanni Cavallo ◽  
Maria Luisa Vázquez de Ágredos Pascual
Keyword(s):  
Powder Diffraction ◽  
Mineralogical Composition ◽  
17Th Century ◽  
Inorganic Materials ◽  
Research Project ◽  
X Ray ◽  
Santa Maria ◽  
Material Preparation ◽  
Inorganic Fraction

The pharmacy (spezieria) Santa Maria della Scala was founded in Rome by the Discalced Carmelites Order in the 17th century, and during the 18th and 19th centuries it became the official supplier of medicines for Vatican Popes. The laboratory and the cases of this spezieria still preserve glass jars with organic and inorganic materials, which were presumably used for medicine and artistic material preparation, whose composition is unknown to date. A research project was initiated with the aim to study the stored materials and the role that the pharmacy played in regional, national and international contexts. In this manuscript, the compounds were analysed through X-ray powder diffraction with the scope to derive the quantitative mineralogical composition of the inorganic fraction, their possible use in pharmacopoeias and as mineral pigments. Most of the analysed samples are salts (sulphates, chlorides, carbonates, phosphates, borates, sulphides), sulphates being the predominant class; oxides were also detected.

scholarly journals Evaluating porosity estimates for sandstones based on X-ray micro-tomographic images

2019 ◽  
Author(s):  
Mathias Nehler ◽  
Ferdinand Stoeckhert ◽  
Anne Oelker ◽  
Jörg Renner ◽  
Erik Saenger
Keyword(s):  
Intensity Distribution ◽  
Mineralogical Composition ◽  
Sem Images ◽  
Attenuation Coefficients ◽  
Thin Sections ◽  
Tomographic Images ◽  
X Ray ◽  
Binary Images ◽  
Segmentation Methods ◽  
Porosity Range

Abstract. We compare experimentally determined porosity with values derived from X-ray tomography for a suite of eight sandstone varieties covering a porosity range from about 3 to 25 %. In addition, we performed conventional stereological analysis of SEM images and examined thin sections. We investigated the sensitivity of segmentation, the conversion of the tomographic gray-value images representing the obtained X-ray attenuation coefficients into binary images, to (a) resolution of the digital images, (b) denoising filters, and (c) seven thresholding methods. Images of sandstones with porosities of 15 to 25 % exhibit a bimodal intensity distribution of the attenuation coefficients, enabling unambiguous segmentation that gives porosity values closely matching the laboratory values. For samples with lower porosities, pores and grains do not separate well in the skewed unimodal intensity histograms. For these samples, all tested thresholding methods tend to miscalculate porosity significantly. In addition to absolute porosity, the ratio between pore size and resolution, and mineralogical composition of the rocks affect the biases of the global segmentation methods.

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