Niobium -chloride NbCl

C2H6, respectively) were introduced into the CVD reactor. The NbsGes could be made to occur naturally in the deposit by control of the Nb/Ge ratio in the deposition atmosphere. At a Td below 900°C, NbsGes doping was used. In the range 750 to 800°C, the hydrogen reduction of niobium chloride, NbCU, was incomplete because of low conversion efficiency. As a result, deposited films occasionally contained a dispersed lower chloride phase, NbCls, particles of which could also serve as fluxoid pinning centers. 

Niobium(III) chloride-Dimethoxyethane, NbCl3 DME (1). This soluble Nb(III) reagent is obtained as a brick-red solid by reduction of NbCl> in DME with Bu,SnH. 

Weight gain data and oxidation-reduction titers (Table II) for the niobium (V) chloride and bromide reaction products both indicated the reduction of niobium (V) to niobium (IV). The niobium (IV) adducts were separated by washing the crude reaction mixtures with anhydrous acetonitrile. This solvent removed the various organic products of the initial reaction plus any unreduced niobium compounds. Analysis of the washed products gave ratios of Nb X py of 1 4 2 and agreed with analyses for samples of NbCl py2 and NbBr4 py2 which... 

Niobium(III) halides are known, notably the chloride, NiCl3. which is of particular interest because its solution has been shown to contain Nb + ions (in equilibrium with NbCl, 3- complex 10ns),... 

The most important starting materials for organometallic complexes of niobium and tantalum are their pentachlorides, NbCls and TaCls. The commercially available pentachlorides can be sublimed if further purification is necessary. They are commonly used for access to both high-valency and low-valency compounds. The crystal structure of NbCl5 consists of dimeric Nb2Cl owith two chlorides bridging as shown in Scheme 7.8, and the Ta analogue is presumed to have a similar structure. In non-... 

Niobium (Colombium) (V) chloride [10026-12-7] M 270.2, m 204.7-209.5 , b 250 (begins to sublime at 125 ), d 2.75. It forms yellow, very deliquescent crystals which decompose in moist air to liberate HCl. It should be kept in a dry box flushed with N2 in the presence of P2O5. Wash it with CCl4 and dry it over P2O5. The yellow crystals usually contain a few small, dirty white pellets among the yellow needles. These should be easily picked out. Upon grinding in a dry box, however, they turn yellow. NbCls has been sublimed and fractionated in an electric furnace. [Epperson Inorg Synth VII 163 1963, Alexander Fairbrother J Chem Soc suppl 233 7949.]... 

Na202 8H20 Sodium peroxide, 3 1 NbCls Niobium (V) chloride, 7 167 NbFs Niobium(V) fluoride, 3 179 NdCh Neodymium chloride, 1 32 6 154n. 

Niobium oxides, provided by the ore treatment, are dissolved in chloride melts (NaCl-KCl or LiCl-KQ) in the form of NbCls [7], and Nb metal is produced by electroreduction in the molten chloride solution. A French company, Cezus, developed this process at the industrial scale in the 1990s [8] for Nb and other refractory metals. Nevertheless, the cathodic process in pure chloride melts was proved to be too complex to be industrially valid, with a series of intermediate steps [8, 9], and provides nonadherent or powder metal layers with a low current efficiency. Better results are obtained in chloride melts containing fluoride ions because of the complexation of Nb in NbF7 ions which are reduced in only two steps Nb —> Nb Nb [10,11], with current efficiencies less than 100 % since Nb reacts readily with Nb cathodic product (proportionation reaction) for giving the intermediate species, Nb. ... 

Niobium. Nb NMR spectroscopy has been used to study NbCls and its mixtures with various alkali chlorides. ... 

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