A barium niobium oxide displaying bronze characteristics is found by the reaction of niobium metal with mixtures of barium and niobium oxides with Ba5Nb4O15. It is a red compound with the cubic perovskite-type structure a0 = 4.080 Å, a good electrical conductor and paramagnetic with Curie-Weiss ...

The recovery of Nb(V) and Ta(V) from alkaline solutions was investigated using calcium-bearing reagents (CaCl2(aq), Ca(CH3COO)+(aq), Ca(NTA)−(aq), Ca(EDTA)2 −(aq), CaCO3(s) and Ca(OH)2(s)) at 25 °C. It was found that hexaniobate and hexatantalate ions (HxNb6O19x − 8 and HxTa6O19x − 8; 0 ≤ x ≤...

Thermally poled niobium borophosphate glasses in the system 0.55(0.95−y) NaPO3+y/2 Ba(PO3)2+0.05Na2B4O7)+0.45Nb2O5 were investigated for second order optical nonlinear (SON) properties. Bulk glasses were studied by Raman spectroscopy, thermal analysis, optical and dielectric measurements. The so...

Oxalate-based aqueous media represent one of the rare options for solubilizing weighable amounts of niobium (Nb) and tantalum (Ta) without using toxic fluoride-based mixtures. Recent progress in the hydrometallurgy of Nb and Ta also highlighted the potential of oxalate-nitrate media for the sepa...

Cubic Li7La3Zr2O12 (LLZO) garnet electrolytes continue to be viewed as an enabler of all-solid-state lithium battery technologies, or as protective membranes for next-generation lithium battery systems. Supervalent dopants at the lithium sublattice are commonly used to stabilise the conductive c...

Germanium (Ge), as an anode material for lithium-ion batteries (LIBs), has received considerable attention because of its high theoretical capacity and excellent electrochemical performance. However, Ge anode usually undergoes large volume expansion during lithium insertion/extraction, resulting...

Here, we report on a size-controlled synthesis of highly crystalline germanium particles, via the self-sustained reaction of GeO2 with Zn, Mg, and NaBH4. The thermodynamic analysis suggests that the GeO2 + 2Zn and GeO2 + NaBH4 systems are characterized by moderate heats of reaction (−121 and −20...

Germanium (Ge) is a promising anode material for lithium-ion batteries (LIBs) due to its large theoretical specific capacity (1600 mA h g−1), high Li diffusivity and large intrinsic electrical conductivity. Despite these merits, its large volumetric change during lithiation/delithiation process ...

Germanium-based materials are considered to be an alternative material for high energy density lithium-ion battery anodes due to their superior theoretical capacity. However, the severe volume expansion during the lithium insertion and the easily agglomerated tendency of Ge nanoparticles become ...

The adsorption of Ethylenediaminetetraacetic acid (EDTA) and its metal complexes, Cu, Fe(III), Hg, Mn and Ni, onto lake sediment was studied. The results reveal that EDTA and metal–EDTA complexes, even though being hydrophilic compounds, are indeed adsorbed within one months' contact time ...

The efficiency of calcium phosphate (CaP) bone substitutes can be improved by tuning their resorption rate. The influence of both crystal orientation and ion doping on resorption is here investigated for beta-tricalcium phosphate (β-TCP). Non-doped and Mg-doped (1 and 6 mol%) sintered β-TCP sa...

The current study was carried out to assess the response of date palm (Phoenix dactylifera L.) to salinity and to examine the possible role of arbuscular mycorrhizal fungi (AMF) in enhancing the salt tolerance. Plants were grown under non-saline or saline conditions (0 and 240 mM NaCl) with and ...

The goal of this study was to fabricate and investigate the chitosan coated poly(lactic-co-glycolic acid) (PLGA) microspheres for the development of controlled release magnesium delivery system. PLGA based microspheres are ideal vehicles for many controlled release drug delivery applications. Ch...

A new analytical method for sensitive determination of cysteine based on its interaction with phenazine methosulfate was developed using salting-out liquid-liquid microextraction followed by spectrophotometric detection. The mechanism of the reaction was studied and confirmed by Fourier transfor...

Resultfor Pb extraction experiments from a contaminated soil performed with citric acid and ethylenediaminetetraacetic acid disodium salt (Na2EDTA) indicate that Na2EDTA is much more efficient. The Pb removal after 5 successive extractions using 24 mL of 0.1 M Na2EDTA solutions and 8 g of soil i...

Water hardness has implications for both human health and industry. The main components that make water hard are calcium and magnesium. The magnesium in hard water may provide a moderate health benefit, but calcium can cause serious problems in industrial processes. This paper presents a rapid-r...

Green liquor dregs are the major inorganic solid side stream of kraft pulp mills which contain environmentally hazardous metals. The presence of hazardous metals in this industrial residue brings statutory limits for its landfilling, although they are not easily mobilized from the solid phase. I...

Basalt fiber (BF) is a promising material for 2,2′-bis(4-cyanatophenyl)isopropylidene reinforcement that is cost effective and has a low dielectric constant. In this study, BF was impregnated with lanthanum-ethylenediaminetetraacetic acid (La-EDTA) to improve its mechanical and interfacial prop...

Temperature dependences of heat capacity CP(T) and lattice parameters a(T), b(T), c(T) of thulium carboboride TmB2C at 2–300 K were experimentally studied. Magnetic phase transition in the carboboride – ‘paramagnetic – antiferromagnetic’ at TN = 11.0 K was revealed. By comparison with the d...

The temperature dependences of heat capacity, Cp(T), and lattice parameters, a(T), b(T), c(T), of ErB50 in the temperature range of 2–300 K were experimentally studied. Two features in Cp(T) were observed: a maximum at Tm1 = 3.12 K, that is associated with a magnetic ordering (transition to an ...