Tellurium source

Darkowski and Cocivera [94] investigated trialkyl- or triarylphosphine tellurides, as low-valent tellurium sources, soluble in organic solvents. They reported the cathodic electrodeposition of thin film CdTe on titanium from a propylene carbonate solution of tri-n-butylphosphine telluride and Cd(II) salt, at about 100 °C. Amorphous, smooth gray films were obtained with thicknesses up to 5.4 p,m. The Te/Cd atomic ratio was seen to depend on applied potential and solution composition with values ranging between 0.63 and 1.1. Polycrystalline, cubic CdTe was obtained upon annealing at 400 C. The as-deposited films could be either p- or n-type, and heat treatment converts p to n (type conversion cf. Sect. 3.3.2). 

Tellurium sources, 22-24 Thermodynamics in cyclo-oligomerization, 185-186 butadiene insertion, 187-188 reductive elimination, 193, 194 selectivity control, 212 polysilane isomerisation, 158-160 see also Stability Thermolysis, 135, 136, 158 THF (tetrahydrofuran), 97, 150, 153 Thio-Wittig reaction, 37 Tin, 121... 

Aldehydes were converted to telluroaldehydes with bis[dimethylalumino] tellurium as the tellurium source. The telluroaldehydes were reacted in situ with m-2,3-dimethyl-l,3-butadiene2. 

We found recently(8) that organic ditellurides (RTeTeR, R=some organic moiety) are potentially useful tellurium source compounds for the preparation of Te-containing II-VI compounds by organometallic vapor phase epitaxy (OMVPE). In the course of those investigations we found (9) that di(aryltellurato) mercury compounds [(RTe)2Hg], formed from the ditelluride and Hg,... 

Manufacture and Recovery. Electrolytic copper refinery slimes are the principal source of selenium and its sister element, tellurium, atomic numbers 34 and 52, respectively. Electrolytic copper refinery slimes are those constituents in the copper anode which are not solubilized during the refining process and ultimately accumulate in the bottom of the electrorefining tank. These slimes are periodically recovered and processed for their metal values. Slimes generated by the refining of primary copper, copper produced from ores and concentrates, generally contain from 5—25% selenium and 2—10% tellurium. 

Refinements have been made on the source term calculational methods since WASH-1400. The general trend has been toward source term reduction (e.g., the iodine release for the large LOCA) as compared with the RSS results. In cases such as Station Blackout, the RSS underestimated the tellurium and barium compared with results from the BMI-2104 suite. 

The reaction of Me3SiNSNSiMc3 with TeCU is an especially fruitful source of chalcogen-nitrogen halides that contain both sulfur and tellurium. The initial product of this reaction is the bicyclic compound 8.17, which is obtained when the reaction is carried out in a 1 2 molar... 

The work of Verbrugge and Tobias on CdTe [8] comprises a comprehensive source of information about the electrochemistry of the compound and its components. Deposition features are reviewed, and thermodynamic, transport, and kinetic parameters for cadmium and tellurium deposition are reported. 

Telluro-cyanide (presumably TeCN ) has been explored as a source of tellurium for electrodeposition of CdTe [14], on account of the possible advantage that this species is less likely than tellurium dioxide to oxidize the cathodically produced telluride ion. Bath solutions were prepared by dissolving powdered Te in a concentrated aqueous solution of KCN and adding CdCb and EDTA. Stoichiometric CdTe deposits, free of excess Te, were reported. 

Tellurium has been tested as a cathode material for use in conjunction with an anode made of alkali metal, primarily lithium, in power sources with a high specific energy and power [99], The theoretical specific energy for Li/Te pair is 612 Wh kg High-temperature (470 °C) cells with Li, Te, and eutectic (LiF-LiCl-Lil) electrolyte in the molten state, or with more convenient, albeit more resistive, paste-type electrolytes, have been tested in the laboratory. Similar layouts have been proposed for utilizing the Li/Se pair (theoretic cal specific energy 1,210 W h kg ) with the cell ingredients in the molten state (365 C) or with paste electrolyte at a lower temperature. 

Source for trailing arbutus aniline discovery and tellurium smell. 

Because Cd(CH3)2 is extremely toxic, pyrophoric, and explosive at elevated temperatures, other Cd sources have been used. CdO appears to be an interesting precursor. CdO powder dissolves in TOPO and HPA (hypophosphorous acid) or TDPA (tetradecylphosphonic acid) at about 300 °C giving a colorless homogeneous solution. By introducing selenium or tellurium dissolved in TOP, nanocrystals grow to the desired size. 

Although progress in the chemistry of Se-N and Te-N compounds has been slower, there have been impressive developments in the last 10 years. Significant differences are apparent in the structures, reactivities and properties of these heavier chalcogen derivatives, especially in the case of tellurium. In addition, the lability of Se-N and Te-N bonds has led to applications of reagents containing these reactive functionalities in organic synthesis and, as a source... 

Porter has recently shown that decomposing tetramethylam-monium amalgam is a source of trimethylamine and methyl free radicals.148 When a current of nitrogen is passed over the amalgam, tellurium mirrors downstream are removed.148... 

Radiation is derived from a sealed quartz tube containing a few milligrams of an element or a volatile compound and neon or argon at low pressure. The discharge is produced by a microwave source via a waveguide cavity or using RF induction. The emission spectrum of the element concerned contains only the most prominent resonance lines and with intensities up to one hundred times those derived from a hollow-cathode lamp. However, the reliability of such sources has been questioned and the only ones which are currently considered successful are those for arsenic, antimony, bismuth, selenium and tellurium using RF excitation. Fortunately, these are the elements for which hollow-cathode lamps are the least successful. 

Enriched or should be used for the reactor irradiation to eliminate unwanted background radiations from the other tellurium isotopes. Radiation damage to the source is unimportant since annealing (13) the ZnTe after irradiation did not change line intensity or width. 

Figure 4. Electric quadrupole spectrum of Te in pure Te at 4.8°K. Source, in Cu at 82°K. Total absorber thickness, 30.0 mg./sq. cm. of tellurium enriched in Te—i.e., Te/Te = 40.4%. Individual lines (A this doublet have a full width at half maximum of 0./3 cm./sec. Our experimental line widths for absorbers vary from 0.67-101 cm./sec.

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