scholarly journals New Evidence of the Brizziite, Sodium Antimonate from the Central Paratethys Sea Strata in Poland

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1403
Author(s):  
Bożena Gołębiowska ◽  
Monika Pilarz ◽  
Krzysztof Bukowski
Keyword(s):  
Chloride Ions ◽  
X Ray Diffraction ◽  
Chloride Complexes ◽  
X Ray ◽  
Layered Clays ◽  
Ore Mineralization ◽  
Drying Up ◽  
Tethys Ocean ◽  
Polymetallic Ore ◽  
New Evidence

Brizziite, a rare sodium antimonate (NaSb5+O3), and fluorcalcioroméite ((Ca,Na)2Sb5+2O6F), have been identified in two boreholes (Pasternik and Włosienica) which are situated 50 km apart. Both wells are located west of Krakow, Poland, and were drilled in the Miocene strata of the Paratethys Sea (a remnant of the Tethys Ocean). The Sb minerals are scattered in a solidified light blue silica gel within marls and layered clays. They occur most often as anhedral grains up to 20 μm in size. The presence of these phases was confirmed by Raman spectroscopy (RS) and X-ray diffraction (XRD). The brizziite from this study represents a secondary mineral after the alteration of roméite within a supergene zone, or crystallization from Sb-rich solutions derived by the leaching of the weathered primary roméite. Hence, the calcium and fluorine admixtures in their composition, determined by EPMA, indicate intergrowths of brizziite and roméite on the micro- to crypto-scale. The presence of the antimony in the study area is related to rejuvenated Old-Paleozoic polymetallic ore-mineralization occurring in the basement of the Krakow-Silesia Monocline. The phenomenon of the repeatability of brizziite in Pasternik and Włosienica, distant by several tens of kilometers, can be explained by the following three steps: (i) the penetration of the chloride ions from the drying up seawaters of the Paratethys Sea into the Miocene groundwater system, (ii) the mobilization of Sb5+ in the form of chloride complexes, and, finally, (iii) the transportation of the Sb-bearing solutions within the marly and clay sediments.

scholarly journals Synthesis, Crystal Structure, Thermal Analysis, and DFT Calculations of Molecular Copper(II) Chloride Complexes with Bitopic Ligand 1,1,2,2-tetrakis(pyrazol-1-yl)ethane

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 222
Author(s):  
Lider ◽  
Sukhikh ◽  
Smolentsev ◽  
Semitut ◽  
Filatov ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Coordination Compounds ◽  
Density Functional ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Chloride Complexes ◽  
Functional Theory ◽  
X Ray ◽  
Lattice Water ◽  
Ir Bands

Two binuclear coordination compounds of Cu(II) chloride with the bitopic ligand 1,1,2,2-tetrakis(pyrazol-1-yl)ethane (Pz4) of the composition [Cu2(µ2Pz4)(DMSO)2Cl4]·4H2O and [Cu2(µ2Pz4)(DMSO)2Cl4]∙2DMSO were prepared and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, single-crystal X-ray diffraction, and powder diffraction analysis. It was shown that in contrast to silver(I) and copper(II) nitrates, copper(II) chloride forms discrete complexes instead of coordination polymers. The supramolecular structure of the complex [Cu2(µ2Pz4)(DMSO)2Cl4]·4H2O with lattice water molecules is formed by OH···Cl and OH···O hydrogen bonds. Density functional theory (DFT) calculations of vibrational frequencies of the ligand and its copper(II) complex allowed for assigning IR bands to specific vibrations.

The effect of amino-alcohol-based corrosion inhibitors on concrete durability

2019 ◽  
Vol 46 (9) ◽  
pp. 771-776 ◽  
Author(s):  
Congtao Sun ◽  
Mingshi Chen ◽  
Haibing Zheng ◽  
Peng Zhang ◽  
Yantao Li ◽  
...  
Keyword(s):  
Amino Alcohol ◽  
Corrosion Inhibitors ◽  
Chloride Ions ◽  
Inhibition Mechanism ◽  
Concrete Durability ◽  
Penetration Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reinforcing Bar ◽  
Two Agents

Laboratory investigation was carried out to assess the effect of amino-alcohol-based corrosion inhibitors on concrete durability, and the inhibition mechanism in concrete was analyzed. Both admixed type and surface-applied type corrosion inhibitors were studied by chloride penetration test, saturation test, scanning electron microscope, and X-ray diffraction. The results showed that the anti-penetrability, compactness, and hydration of concrete were improved after the two types of corrosion inhibitors were applied. The use of corrosion inhibitors mitigated the penetration of chloride ions and water into concrete, which effectively delayed corrosion of the reinforcing bar. The surface-applied corrosion inhibitor showed better efficiency in the concrete specimens compared to the admixed type. Moreover, there was a better synergy between the two agents and the best performance when the two agents were applied to the concrete simultaneously.

Synthesis, Characterization, and Catalytic Activity of a Series of Aluminium–Amidate Complexes

2015 ◽  
Vol 68 (3) ◽  
pp. 357 ◽  
Author(s):  
Kevin P. Yeagle ◽  
Darryl Hester ◽  
Nicholas A. Piro ◽  
William G. Dougherty ◽  
W. Scott Kassel ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
X Ray Diffraction ◽  
Metathesis Reaction ◽  
Chloride Complexes ◽  
1H And 13C Nmr ◽  
X Ray

The aluminium complexes {[κ2-N,O-(t-BuNCOPh)]AlMe2}2 (2), [κ2-N,O-(t-BuNCOPh)]2AlMe (3), and [κ2-N,O-(t-BuNCOPh)]3Al (4) were prepared through the protonolysis reaction between trimethylaluminium and one, two, or three equivalents, respectively, of N-tert-butylbenzamide. Complex 2 was also prepared via a salt metathesis reaction between K(t-BuNCOPh) and dimethylaluminium chloride. Complexes 2–4 were characterized using 1H and 13C NMR spectroscopy. Single-crystal X-ray diffraction analysis of the complexes corroborated ligand : metal stoichiometries and revealed that all the amidate ligands coordinate to the aluminium ion in a κ2 fashion. The Al–amidate complexes 2–4 were viable catalyst precursors for the Meerwein–Ponndorf–Verley–Oppenauer reduction–oxidation manifold, successfully interconverting several classes of carbonyl and alcohol substrates.

scholarly journals An X-Ray Diffraction and Raman Study of Mercury(II) Chloride Complexes in Aqueous Solution. Evidence for the Formation of Polynuclear Complexes.

1977 ◽  
Vol 31a ◽  
pp. 141-150 ◽  
Author(s):  
Magnus Sandström ◽  
Tore Thorstenson ◽  
Elina Näsäkkälä ◽  
Arne Kjekshus ◽  
Trond Rakke ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Polynuclear Complexes ◽  
X Ray Diffraction ◽  
Chloride Complexes ◽  
X Ray ◽  
Raman Study

Durability of cement-based materials in simulated radioactive liquid waste: Effect of phosphate, sulphate, and chloride ions

1998 ◽  
Vol 13 (8) ◽  
pp. 2151-2160 ◽  
Author(s):  
A. Guerrero ◽  
S. Hérnandez ◽  
S. Goñi
Keyword(s):  
Mercury Intrusion Porosimetry ◽  
Cement Mortar ◽  
Pore Solution ◽  
Liquid Waste ◽  
Chloride Ions ◽  
X Ray Diffraction ◽  
Radioactive Liquid Waste ◽  
X Ray ◽  
Medium Level ◽  
Pozzolanic Cement

The durability of a specific backfilling pozzolanic cement mortar, which is employed in Spain, in concrete containers for the storage of low (LLW) and medium level wastes (MLW), has been studied by means of the Köch–Steinegger test at the temperature of 40 °C during a period of 365 days. Mortar samples were immersed in a simulated radioactive liquid waste very rich in sulphate (0.68 M), phosphate (0.89 M), and chloride (0.51 M) ions. The changes of the microstructure were followed by x-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM). Pore solution was extracted at different periods in order to see the changes of the chemical composition caused by the diffusion of those ions inside the microstructure.

Are ionic solids really built of ions? New evidence from x-ray diffraction

1986 ◽  
Vol 69 (5) ◽  
pp. 1107-1112 ◽  
Author(s):  
Paul Seiler ◽  
Jack D. Dunitz
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Ionic Solids ◽  
New Evidence

A Novel Route to Aluminum Nitride Ceramics Using a Polyaminoalane Precursor

1988 ◽  
Vol 121 ◽  
Author(s):  
M. Seibold ◽  
C. Rüssel
Keyword(s):  
Aluminum Nitride ◽  
Polymer Network ◽  
Polymerization Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Peak Broadening ◽  
Gas Atmosphere ◽  
Nitride Ceramics ◽  
Crystallite Sizes ◽  
Drying Up

ABSTRACTMetallic Aluminum is dissolved anodically in an electrolyte, containing a primary amine, an aprotic solvent and a tetraalkylammonium salt. Removal of the solvent and subsequent heating lead to a polymer network. Initial drying causes a more viscous liquid, further drying up to 150°C accelerates the polymerization process and a gel-like consistency is obtained. Pyrolysis is carried out under NH3 or inert gas atmosphere. X-ray diffraction data show amorphous products up to 800°C, treatment above 800°C leads to the desired ceramic product aluminum nitride. Peak broadening indicates extremely small crystallite sizes. Pressureless sintering without additives gives a compact product, having densities up to nearly 100% of the theoretical density.

scholarly journals Synthesis and crystal structure of dichlorido(1,10-phenanthroline-κ2N,N′)gold(III) hexafluoridophosphate

2017 ◽  
Vol 73 (7) ◽  
pp. 1048-1051 ◽  
Author(s):  
Raphael Enoque Ferraz de Paiva ◽  
Douglas Hideki Nakahata ◽  
Pedro Paulo Corbi
Keyword(s):  
Crystal Structure ◽  
Crystal Packing ◽  
Chloride Ions ◽  
Mass Spectrometric ◽  
Spectrometric Analysis ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Square Planar ◽  
Phenanthroline Ligand

A gold(III) salt of composition [AuCl2(C12H8N2)]PF6was prepared and characterized by elemental and mass spectrometric analysis (ESI(+)–QTOF–MS),1H nuclear magnetic resonance measurements and by single-crystal X-ray diffraction. The square-planar coordination sphere of AuIIIcomprises the bidentate 1,10-phenanthroline ligand and two chloride ions, with the AuIIIion only slightly shifted from the least-squares plane of the ligating atoms (r.m.s. = 0.018 Å). In contrast to two other previously reported AuIII-phenantroline structures that are stabilized by interactions involving the chlorido ligands, the packing of the title compound does not present these features. Instead, the hexafluoridophosphate counter-ion gives rise to anion...π interactions that are a crucial factor for the crystal packing.

COMBINED X-RAY AND STM STUDY OF THE OXYGEN-INDUCED RESTRUCTURING OF THE Au(111) SURFACE

1997 ◽  
Vol 04 (06) ◽  
pp. 1315-1319 ◽  
Author(s):  
L. ORTEGA ◽  
L. HUANG ◽  
J. CHEVRIER ◽  
P. ZEPPENFELD ◽  
J. M. GAY ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Long Range ◽  
Extended Period ◽  
Grazing Incidence ◽  
Scanning Tunneling ◽  
X Ray Diffraction ◽  
Tunneling Microscopy ◽  
X Ray ◽  
New Evidence

Au(111) surfaces exposed to oxygen under high pressure (p O2 =1 bar) and at high temperature (T≈800°C) during an extended period of time (several hours) exhibit a ([Formula: see text]R30° structure and, at larger scales (a few nanometers), a long range hexagonal height modulation with a period of 72 Å. This is evidenced by X-ray diffraction at grazing incidence performed at the ESRF. These results confirm and complete previous surface analysis in direct space by scanning tunneling microscopy (STM). This new evidence for a long range superstructure by X-ray diffraction provides new insights into the origin of the moiré patterns observed in the STM study.

Sign in / Sign up

Export Citation Format

Share Document