14C Dating and Material Analysis of the Lime Burial of Cova de Na Dent (Mallorca, Spain)

Lime burials are a characteristic phenomenon of the protohistoric funerary tradition on the Balearic Islands. At Cova de Na Dent, a lime burial has been sampled for analysis. The lime burial was made up of lime and fragmented bones. Six layers were sampled and described in the laboratory according to their color, the consistency of the deposition, and the aspect and quantity of the bone fragments. Bone samples and lime were dated. The lime was analyzed by using petrographic analysis, X-ray diffraction, FTIR spectroscopy, and simultaneous thermal analysis. The results show that the bones were cremated in the presence of crushed rock carbonate. The14C dates on the lime suggest an earlier chronology for this ritual, starting in the Bronze Age, as generally is accepted.

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Determination of the firing temperature and redox atmosphere of the pottery from the Bronze Age settlement Kamenny Ambar by x-ray diffraction phase analysis

10.1063/1.5134394 ◽

2019 ◽

Author(s):

M. P. Piskareva ◽

A. D. Ryanskaya ◽

D. V. Kiseleva ◽

S. E. Panteleeva

Keyword(s):

Bronze Age ◽

Phase Analysis ◽

Firing Temperature ◽

X Ray Diffraction ◽

X Ray ◽

The Bronze Age

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Magnesium Oxybromides MOB-318 and MOB-518: Brominated Analogues of Magnesium Oxychlorides

Applied Sciences ◽

10.3390/app10114032 ◽

2020 ◽

Vol 10 (11) ◽

pp. 4032

Author(s):

Anna-Marie Lauermannová ◽

Michal Lojka ◽

Filip Antončík ◽

David Sedmidubský ◽

Milena Pavlíková ◽

...

Keyword(s):

Building Materials ◽

Simultaneous Thermal Analysis ◽

Heating Process ◽

X Ray Diffraction ◽

Sustainable Building ◽

X Ray ◽

Environmentally Sustainable ◽

Transmission Electron ◽

Magnesium Oxychloride ◽

Sustainable Building Materials

The search for environmentally sustainable building materials is currently experiencing significant expansion. It is increasingly important to find new materials or reintroduce those that have been set aside to find a good replacement for Portland cement, which is widely used despite being environmentally insufficient and energy-intensive. Magnesium oxybromides, analogues to well-known magnesium oxychloride cements, fit both categories of new and reintroduced materials. In this contribution, two magnesium oxybromide phases were prepared and thoroughly analyzed. The stoichiometries of the prepared phases were 5Mg(OH)2∙MgBr2∙8H2O and 3Mg(OH)2∙MgBr2∙8H2O. The phase analysis was determined using X-ray diffraction. The morphology was analyzed with scanning and transmission electron microscopy. The chemical composition was studied using X-ray fluorescence and energy dispersive spectroscopy. Fourier transform infrared spectroscopy was also used. The thermal stability and the mechanism of the release of gasses linked to the heating process, such as water and hydrobromic acid evaporation, were analyzed using simultaneous thermal analysis combined with mass spectroscopy. The obtained results were compared with the data available for magnesium oxychlorides.

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Effect of P2O5 on the Properties of Alite-Calcium Strontium Sulphoaluminate Cement

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.961 ◽

2011 ◽

Vol 306-307 ◽

pp. 961-965

Author(s):

Chao Nan Yin ◽

Ling Chao Lu ◽

Shou De Wang

Keyword(s):

Compressive Strength ◽

Electron Microscope ◽

Heat Evolution ◽

Petrographic Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Sulphoaluminate Cement ◽

Suitable Amount ◽

Acceleration Period ◽

Scanning Electron

The influence of P2O5on the properties of alite-calcium strontium sulphoaluminate cement was researched by means of X-ray diffraction, scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) and petrographic analysis. The results show that the optimal content of P2O5is 0.3% and the compressive strength of the cement at 1, 3, 28d are 27.0, 59.1, 110.9MPa when the calcining temperature is 1350°C. P2O5mainly exists in the belite and a suitable amount of P2O5can promote the formation of C1.5Sr2.5A3and alite. When the content of P2O5is higher than 0.3%, the formation of C1.5Sr2.5A3and alite can be hindered. P2O5can enhance the hydration heat evolution rate in the acceleration period and the hydrate heat of cement containing P2O5increases slightly.

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Thermal Stability and Kinetics of Formation of Magnesium Oxychloride Phase 3Mg(OH)2∙MgCl2∙8H2O

Materials ◽

10.3390/ma13030767 ◽

2020 ◽

Vol 13 (3) ◽

pp. 767 ◽

Cited By ~ 6

Author(s):

Michal Lojka ◽

Ondřej Jankovský ◽

Adéla Jiříčková ◽

Anna-Marie Lauermannová ◽

Filip Antončík ◽

...

Keyword(s):

Thermal Stability ◽

Construction Materials ◽

Simultaneous Thermal Analysis ◽

Rietveld Analysis ◽

X Ray Diffraction ◽

Sustainable Building ◽

X Ray ◽

Kinetics Of Formation ◽

Magnesium Oxychloride ◽

Kinetics Of

In this paper, magnesium oxychloride cement with stoichiometry 3Mg(OH)2∙MgCl2∙8H2O (MOC 3-1-8) was prepared and characterized. The phase composition and kinetics of formation were studied by X-ray diffraction (XRD) and Rietveld analysis of obtained diffractograms. The chemical composition was analyzed using X-ray fluorescence (XRF) and energy dispersive spectroscopy (EDS). Furthermore, scanning electron microscopy (SEM) was used to study morphology, and Fourier Transform Infrared (FT-IR) spectroscopy was also used for the analysis of the prepared sample. In addition, thermal stability was tested using simultaneous thermal analysis (STA) combined with mass spectroscopy (MS). The obtained data gave evidence of the fast formation of MOC 3-1-8, which started to precipitate rapidly. As the length of the time of ripening increased, the amount of MgO decreased, while the amount of MOC 3-1-8 increased. The fast formation of the MOC 3-1-8 phase at an ambient temperature is important for its application in the production of low-energy construction materials, which corresponds with the challenges of a sustainable building industry.

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Thermodynamic Properties of Stoichiometric Non-Superconducting Phase Y2BaCuO5

Materials ◽

10.3390/ma12193163 ◽

2019 ◽

Vol 12 (19) ◽

pp. 3163

Author(s):

Filip Antončík ◽

David Sedmidubský ◽

Adéla Jiříčková ◽

Michal Lojka ◽

Tomáš Hlásek ◽

...

Keyword(s):

Thermodynamic Properties ◽

High Temperature Superconductor ◽

Simultaneous Thermal Analysis ◽

Rietveld Analysis ◽

Drop Calorimetry ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

X Ray ◽

Green Coloration ◽

Ab Initio Dft

Y2BaCuO5 often occurs as an accompanying phase of the well-known high-temperature superconductor YBa2Cu3O7 (also known as YBCO). Y2BaCuO5, easily identifiable due to its characteristic green coloration, is often referred to as ‘green phase’ or ‘Y-211’. In this contribution, Y2BaCuO5 phase was studied in detail with a focus on its thermal and thermodynamic properties. Energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were employed in the study of sample’s morphology and chemical composition. XRD data were further analyzed and lattice parameters refined by Rietveld analysis. Simultaneous thermal analysis was employed to study thermal stability. Particle size distribution was analyzed by laser diffraction. Finally, thermodynamic properties, namely heat capacity and relative enthalpy, were measured by drop calorimetry, differential scanning calorimetry (DSC), and physical properties measurement system (PPMS). Enthalpy of formation was assessed from ab-initio DFT calculations.

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Radiocarbon dating of the bronze age bone pins from Eurasian steppe

Geochronometria ◽

10.2478/s13386-011-0015-8 ◽

2011 ◽

Vol 38 (2) ◽

pp. 107-115 ◽

Cited By ~ 1

Author(s):

Natalia Shishlina ◽

Johan Plicht ◽

Elya Zazovskaya

Keyword(s):

Bronze Age ◽

Radiocarbon Dating ◽

North Caucasus ◽

14C Dating ◽

The Caucasus ◽

The North ◽

Eurasian Steppe ◽

Culture Formation ◽

First Time ◽

The Bronze Age

AbstractBone catapult and hammer-headed pins played one of very specific roles in funerary offerings in the Bronze Age graves uncovered in the Eurasian Steppes and the North Caucasus. Scholars used different types of pins as key grave offerings for numerous chronological models. For the first time eight pins have been radiocarbon dated. 14C dating of bone pins identified the catapult type pin as the earliest one. They marked the period of the Yamnaya culture formation. Then Yamnaya population produced hammer-headed pins which became very popular in other cultural environments and spread very quickly across the Steppe and the Caucasus during 2900–2650 cal BC. But according to radiocarbon dating bone pins almost disappeared after 2600 cal BC.

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Synthesis, Microstructure and the Crystalline Structure of the Barium Titanate Ceramics Doped with Lanthanum

Archives of Metallurgy and Materials ◽

10.2478/amm-2013-0163 ◽

2013 ◽

Vol 58 (4) ◽

pp. 1305-1308 ◽

Cited By ~ 7

Author(s):

B. Wodecka-Duś ◽

M. Plońska ◽

D. Czekaj

Keyword(s):

Thermal Analysis ◽

Crystalline Structure ◽

Diffraction Method ◽

Simultaneous Thermal Analysis ◽

Tetragonal Symmetry ◽

X Ray Diffraction ◽

Ceramic Powders ◽

X Ray ◽

Composition Formula ◽

Titanate Ceramics

Abstract In the present study BaTiO3 and Ba1-xLaxTiO3 (0.1-0.4mol.% La) ceramic powders were synthesized by the conventional mixed oxide method (MOM). The characterization of the ceramic powders was carried out using a simultaneous thermal analysis (STA), with a combined DTA/TG/DTG system (Netzsch STA409). The results of thermal analysis allowed to determine the optimal temperature of synthesis. Microstructure was investigated by scanning electron microscopy (SEM), crystalline structure was studied by X-ray diffraction method (XRD). The EDS investigations showed that samples exhibited conservation of stoichiometry according to the chemical composition formula. The X-ray diffraction analysis confirmed formation of the desired crystalline structure both pure and La3+-doped BaTiO3 ceramics exhibiting a perovskite-type structure ABO3 with tetragonal symmetry P4 mm.

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Terrazzo floor from the Jewish Historical Institute in Warsaw – mineralogical characterization, conservation and impact of fire

Geoscience Records ◽

10.1515/georec-2017-0001 ◽

2017 ◽

Vol 4 (1) ◽

pp. 1-13

Author(s):

Wojciech Bartz ◽

Jacek Martusewicz

Keyword(s):

World War Ii ◽

Ordinary Portland Cement ◽

Simultaneous Thermal Analysis ◽

Iron Ions ◽

Thermal Impact ◽

X Ray Diffraction ◽

World War ◽

Mineralogical Characterization ◽

X Ray ◽

Repair Mortars

Abstract Samples of historical terrazzo floor from the Jewish Historical Institute in Warsaw, dated back to the thirties of the twentieth century, have been analysed. Investigations by polarised optical microscopy, scanning microscopy, powder X-ray diffraction and simultaneous thermal analysis were preformed. Based on the results obtained, it was concluded that terrazzo tiles were prepared on the basis of ordinary Portland cement and aggregate, dominated with crushed stone (marble, serpentinite, limestone and marl), accompanied by sparse quartz sand grains. The binding mass was colourised with the use of pigments containing iron ions. The occurrence of altered serpentinite and marble grains, the latter clouded and partly replaced with micrite, the presence of portlandite, indicate the terrazzo tiles were subjected to thermal impact. This is related to the fire that took place at the beginning of World War II. Based on this study, repair mortars were formulated, on one hand compatible with the authentic ones, on the other retaining traces of fire.

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Mineralogical Study of Levels with Magnesian Clay Minerals in the Santos Basin, Aptian Pre-Salt Brazil

Minerals ◽

10.3390/min11090970 ◽

2021 ◽

Vol 11 (9) ◽

pp. 970

Author(s):

Maurício Dias da Silva ◽

Márcia Elisa Boscato Gomes ◽

André Sampaio Mexias ◽

Manuel Pozo ◽

Susan Martins Drago ◽

...

Keyword(s):

Clay Minerals ◽

Clay Fraction ◽

Total Sample ◽

Petrographic Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Mineralogical Study ◽

Original Rock ◽

Mixed Layers

The object of this study is magnesian clay minerals present in carbonate rocks of the post-rift phase of the pre-salt in the Santos Basin. These rocks developed in an Aptian-age alkaline lacustrine environment. This study summarizes the formation of clay minerals associated with different lithotypes in a range of 19 m and a depth of more than 5100 m. They were characterized from petrographic analysis by optical microscopy, X-ray diffraction (total sample and clay fraction), and modeling by Newmod®; and examined and analyzed by scanning electron microscopy. An approach based on identifying lithotypes and characterization of microsites allowed us to understand the occurrence of different clay minerals. Kerolite was the most abundant mineral in the sampled range. It occurs in lamellar aggregates under greater preservation of the original rock lamination and in association with spherulites and shrubs. The Stv/Ker mixed layers occurs in the same association, and formed finer unlaminated aggregates associated with the more intense dolomitization and silicification processes. Saponite occurs associated with detrital minerals forming clayey levels intercalated with microcrystalline carbonates. Fluids with a high Mg/Si and pH < 9 favor the precipitation of kerolite. The increase in pH during diagenesis may be responsible for the formation of Stv/Ker mixed layers.

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