The electrical and semiconducting properties of thin anodic passive films potentiostatically formed (1 V ≤ Ef ≤ 5 V vs. sce) on polycrystalline niobium electrodes in aqueous 0.5 mol/L H3PO4 solutions (pH 1.3) were studied, at room temperature, using electrochemical impedance spectroscopy. The data were analysed with a transfer function using a non-linear fitting routine, assuming that the resis...

This research examined the effect of chemical factors (pH, sodium chloride, sugars (glucose and sucrose), preservatives (benzoic acid and sorbic acid)) and clove oil to decrease the growth of film yeasts (Saccharomyces cerevisiae J1, Candida krusei J2 and Candida krusei J3) on fermented bamboo shoots. All yeasts grew at pH 3.0-7.0 and did not grow greater than 7.5%(w/v) of sodium chloride conce...

In the title compound, [Nb(CH(3)O)(2)(C(5)H(7)O(2))Cl(2)], a slightly distorted octa-hedral coordination geometry is observed around the Nb(V) atom with Nb-O distances in the range of 1.8254 (16)-2.0892 (16) Å and Nb-Cl distances of 2.3997 (14) and 2.4023 (12) Å. The O-Nb-O angles vary between 81.36 (7) and 172.65 (7) °, while the trans Cl-Nb-Cl angle is 167.34 (2)°. There are no hydrogen bonds...

In the title dinuclear Nb(V) compound, [Nb(2)(C(44)H(28)N(4))(2)O(3)], each Nb atom is seven-coordinated with three bridging O atoms and four N atoms from a chelating tetra-phenyl-porphyrinate anion. The Nb-O bond lengths range from 1.757 (6) to 2.331 (6) Å, and the average (niobium-pyrrole N atom) distance is 2.239 Å. In the dinuclear mol-ecule, the Nb⋯Nb separation is 2.8200 (8) Å, and the di...

The use of liquid-liquid extraction for the separation of tantalum from niobium was demonstrated. Tantalum and niobium spectrographically free of each other were prepared in quantity on a continuous basis.

We report on a 850 GHz SIS heterodyne receiver employing a RF tuned niobium tunnel junction with a current density of 14kA/cm2, fabricated on a 1 μm Si3N4 supporting membrane. Since the mixer is designed to be operated well above the superconducting gap frequency of niobium (2 /h ≈ 690 GHz), special care has been taken to minimize niobium transmission line losses. Both Fourier Transform Spectro...