scholarly journals Mineral phase composition of the surface dirt sediment in an urban environment

2019 ◽  
Vol 317 ◽  
pp. 012009
Author(s):  
A Seleznev ◽  
I Yarmoshenko ◽  
D Kiseleva ◽  
A Ryanskaya ◽  
G Malinovsky ◽  
...  
Keyword(s):  
Phase Composition ◽  
Urban Environment ◽  
Mineral Phase

Study on Physicochemical Properties of the Carbonated Hydroxyapatite Bone Cement

2007 ◽  
Vol 280-283 ◽  
pp. 1545-1548
Author(s):  
Li Min Dong ◽  
Chen Wang ◽  
Jie Mo Tian ◽  
Jian Pan ◽  
Qing Feng Zan
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Physicochemical Properties ◽  
Bone Cement ◽  
Pore Size ◽  
Setting Time ◽  
Mineral Phase ◽  
Carbonated Hydroxyapatite ◽  
Natural Bone ◽  
Ft Ir

Carbonated hydroxyapatite (CHA) bone cement is capable of self-setting and has the component similar to the mineral phase of natural bone. But it is compact in structure and short of cavity, which limits new bone growing into CHA bone cement. In this paper, the foaming method was adopted to prepare the porous CHA. The setting time, compressive strength, porosity and pore size of the CHA were examined. The phase composition of the CHA was tested with XRD and FT-IR. The microstructure of the CHA was observed with SEM. The results show that setting time of 7~19 minutes, compressive strength of 26~32MPa, pore size of 100~200µm, porosity of 50~60%.

scholarly journals Performances of vermiculite and perlite based thermal insulation lightweight concretes

2020 ◽  
Vol 52 (2) ◽  
pp. 149-162
Author(s):  
Anja Terzic ◽  
Jovica Stojanovic ◽  
Ljubisa Andric ◽  
Ljiljana Milicic ◽  
Zagorka Radojevic
Keyword(s):  
Phase Composition ◽  
Thermal Insulation ◽  
Mix Design ◽  
Expanded Perlite ◽  
X Ray Diffraction ◽  
Mineral Phase ◽  
X Ray ◽  
Expanded Vermiculite ◽  
Concrete Mix ◽  
Aluminate Cement

This experimental study was conducted with an aim to investigate the effect of the elevated temperature on the mineral phase composition, microstructure and mechanical properties of the thermal insulation lightweight concretes. The first group of experimental concretes was based on the expanded vermiculite and expanded perlite used as lightweight aggregates (in 65 wt%) in combination with either ordinary Portland cement or refractory calcium aluminate cement. The mix-design of the second group of concretes comprised standard quartz aggregate, vermiculite or perlite as aggregate replacement (25 wt%) and binder (PC or CAC). A total of 10 concrete mix-designs were fabricated in form of 40?40?160 mm samples which were submitted to heat-treatment at 400?, 600?, 800? and 1000?C upon standard 28-days period of curing and hardening. The changes in crystallinity and mineral phase composition induced by temperature were monitored by X-ray diffraction technique. Microstructural visualizations of the non-fired and fired concrete samples were conducted by scanning electron microscopy accompanied with EDX analysis. The results indicated that despite the decrease in compressive strengths upon firing, investigated lightweight concretes can be categorized both as thermal insulators and structural materials.

A Comparison between X-Ray Diffraction and Petrography Techniques Used to Determine the Mineralogical Composition of Granite and Comparable Hard Rocks

2006 ◽  
Vol 514-516 ◽  
pp. 1628-1632 ◽  
Author(s):  
Pedro M. Amaral ◽  
Jorge Cruz Fernandes ◽  
Luís Guerra Rosa
Keyword(s):  
Phase Composition ◽  
Mineralogical Composition ◽  
Xrd Analysis ◽  
Textural Analysis ◽  
X Ray Diffraction ◽  
Mineral Phase ◽  
X Ray ◽  
Hard Rocks ◽  
Quantitative Procedure

Petrography and X-ray diffraction techniques are used in this work to determine the mineralogical composition of a granite, a gabbro and a quartzite. The experimental difficulties and the results obtained by both methods are described and discussed. The semi-quantitative procedure of XRD analysis used in this work allows an estimate of the relative mineral phase composition of each type of rock. Petrography was found to be crucial in terms of textural analysis.

BRAZILIAN GEODES IN MOSCOW STATE UNIVERSITY’S MINERALOGICAL GALLERY “NATURE’S ART IN

2021 ◽  
Vol 43 (4) ◽  
pp. 504-511
Author(s):  
Tatyana Ivanova ◽  
Larisa Shvanskaya ◽  
Yevgeny Vlasov
Keyword(s):  
Phase Composition ◽  
Mineral Composition ◽  
Morphological Features ◽  
X Ray Diffraction ◽  
Mineral Phase ◽  
X Ray

The article describes the morphological features and mineral composition of two amethyst geodes from the exposition of Moscow State University’s mineralogical gallery “Nature’s Art in Stone”, based on the Primo Rovis collection. The article presents data from the studies of the phase composition of the geodes by powder X-ray diffraction (XRD) and micro X-ray spectral (XRD) analyses, and contains microphotographs. The mechanism of mineral phase crystallization of the described geodes is proposed.

Automated mineral analysis in TASK8

1990 ◽  
Vol 48 (2) ◽  
pp. 212-213
Author(s):  
William F. Chambers ◽  
Arthur A. Chodos ◽  
Roland C. Hagan
Keyword(s):  
National Laboratory ◽  
Control Program ◽  
Mineral Analysis ◽  
Alamos National Laboratory ◽  
Mineral Phase ◽  
Los Alamos National Laboratory ◽  
California Institute Of Technology ◽  
Mineral Phases ◽  
Letter Code ◽  
Institute Of Technology

TASK8 was designed as an electron microprobe control program with maximum flexibility and versatility, lending itself to a wide variety of applications. While using TASKS in the microprobe laboratory of the Los Alamos National Laboratory, we decided to incorporate the capability of using subroutines which perform specific end-member calculations for nearly any type of mineral phase that might be analyzed in the laboratory. This procedure minimizes the need for post-processing of the data to perform such calculations as element ratios or end-member or formula proportions. It also allows real time assessment of each data point.The use of unique “mineral codes” to specify the list of elements to be measured and the type of calculation to perform on the results was first used in the microprobe laboratory at the California Institute of Technology to optimize the analysis of mineral phases. This approach was used to create a series of subroutines in TASK8 which are called by a three letter code.

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