The new ternary selenides, Ba4Fe3Se10 and BaFe2Se4, were synthesized from a reaction of appropriate amounts of elements at high temperature in a silica sealed tube, and their structures were resolved using X-ray single crystal diffraction. BaFe2Se4 crystallizes in the tetragonal space group I4/m...

Tin selenide (SnSe and SnSe2) nanostructures have been synthesized by a one-pot reaction involving thermolysis of diorganotinbis (5-methyl-2-pyridyl selenolates), [R2Sn{SeC5H3(Me-5)N}2] (R = tBu (1), Et (2) or Me (3)) in a high boiling coordinating solvent. The latter have been isolated by treat...

A new synthesis for the preparation of multigram amounts of high purity halogen boracites is presented. The boracites NiBr, MgCl, ZnCl, CoBr and MnI among others are prepared in essentially 100% yields and at temperatures as low as 200°C in less than six hours. Mechanistic studies pro...

Defect centers induced by X-ray irradiation in zinc-halogen boracites have been observed for the first time by ESR spectroscopy. Four types of defects have been observed: O−, BO2−3, B2+ and Zn+ O− and BO2−3 centers have been strictly identified as unpaired spins localized, respectively, on a par...

The thermal decomposition under argon of the boracites M3B7O13X (M=divalent metal ion, X=halogen ion or OH−) has been studied by thermogravimetry (TG) and differential thermal analysis (DTA) for the compositions MgCl, MgOH, CrC1, CrBr, CrI, MnCl, MnBr, MnI, FeCl, FeBr, FeI, CoCl, CoBr, CoI, NiCl...

The infrared and far-infrared (20–4000 cm−1) reflectivities of single crystals of nickel bromide and copper-chloride boracite have been measured in the ferroelectric and paraelectric phases. The spectral features of the boracites above 200 cm−1 are very similar and can be associated with the in...

The study investigated the domain structure of nickel bromine boracite single crystals, by means of polarised-light in conjunction with transmission electron microscopy. Single crystals of Ni3B7O13Br were grown by chemical transport reactions in closed quartz ampoules, in the temperature range o...

Landau theory is used to describe the ferroelectric trigonal phase of Boracites. The temperature dependence of the principal reciprocal susceptibility is obtained. The calculated result shows that at the Curie temperature Tc, the spontaneous polarization jumps. The component of the principal rec...

The M–Cl (M=Fe, Co, Ni) boracites are prepared by a procedure consisting of solution mixing, evaporating to dryness, grinding and heating reaction in N2 atmosphere. The lattice parameter and the phase transition temperatures of the boracites Co3B7O13Cl and Ni3B7O13Cl are investigated by means o...

The Fe–Cl boracite is prepared by a procedure, consisting of solution mixing, heating, grinding and H2 reduction. The high valence metal ion Fe3+ reacts with H2 to form the low valence metal ion Fe2+, so that the corresponding boracite can be synthesized. The lattice parameters and the phase tr...

Boracite is a magnesium borate mineral with formula: Mg3B7O13Cl and occurs as blue green, colorless, gray, yellow to white crystals in the orthorhombic – pyramidal crystal system. An intense Raman band at 1009 cm−1 was assigned to the BO stretching vibration of the B7O13 units. Raman bands at 1...

In this study, solubility measurements regarding boracite [Mg3B7O13Cl(cr)] and aksaite [MgB6O7(OH)6·2H2O(cr)] from the direction of supersaturation were conducted at 22.5 ± 0.5 °C. The equilibrium constant (log10K0) for boracite in terms of the following reaction,Mg3B7O13Clcr+15H2Ol⇌3Mg2++7BO...

Proton-conducting polymer electrolytes consisting of borotungstic acid (BWA) and polyacrylamide (PAM) were developed. The addition of BWA to PAM progressively improved the electrolyte conductivity. The as-fabricated BWA-PAM electrolyte exhibited a high ionic conductivity of ca. 27 mS cm−1, but s...

Thermite reactions between metal fuels and oxide oxidizers are highly exothermic and self-sustaining, so they find wide applications in the explosion, pyrotechnics, thermal batteries, micro-actuator, and material synthesis and process. Compared to the well-studied aluminum (Al)-based thermites, ...

The Shajingou gold deposit is a recently discovered medium-scale gold deposit in southeastern Jilin Province, Northeast China. The deposit is located in the easternmost segment of the northern margin of the North China Craton (NCC). This study investigated the mineralization age and tectonic set...

The Gezigou gold deposit, which is located in west Junggar (Xinjiang, China), is mainly hosted in graphite-bearing siltstone. These ore bodies, which consist of gold-bearing hydrothermal veins and mineralized siltstone with disseminated sulfides, formed in three stages: quartz-sulfides-native go...

The Axi gold deposit containing 12 Mt of ore with an average Au grade of 5 g/t is the largest low-sulfidation epithermal gold deposit in Chinese Tianshan. It is hosted by Late Devonian to Early Carboniferous continental arc volcanic rocks in the Tulasu volcanic-sedimentary Basin in North Tiansha...

The effect of heavy metals-containing gold ore mineralogy on gold oxidation kinetics in solutions with various free cyanide (CN) and dissolved oxygen (DO) concentrations was studied by electrochemical tests. To effectively simulate the cyanide gold leaching conditions, the electrochemical experi...

The integration of chemically distinct materials within a single nanostructure is an effective way to increase their functionality for given applications. Herein, we report a two-phase method with remarkable simplicity and universality for the synthesis of nanocomposites consisting of metal sulf...

The Ashanti belt, a world-renowned gold producing region in southwest Ghana, has received renewed attention in recent years. Most studies, however, focused on the major deposits situated along the Ashanti shear zone and in the adjacent Tarkwa Basin to the east, neglecting smaller yet important o...