Hydrogen argon atmosphere

Figure 6.7 Stripping voltammetry of saturated CO adlayers on Pt(l 11) cooled in a hydrogen-argon atmosphere (dashed line), leading to a well-defined smooth surface, and on Pt(lll) cooled in air (full line), leading to a less well-defined defect-rich surface sweep rate 50 mV/s.

To demonstrate the viability of the synthesis and characterization approach in the present workflow, two binary Pt-Fe alloy libraries were designed, synthesized and characterized by XRD (Figs. 11.4 to 11.6) [19]. One library (Fig. 11.5) was characterized as synthesized, while the other (Fig. 11.6) was annealed at 400 °C for 12 h in a hydrogen/argon atmosphere. Pt-Fe is a well-known binary alloy system, exhibiting both substitutional solid solution compositional ranges and intermetal-lic compounds. 

As an example of the determination of sulfur, the TG curve of the oxidation of NiS2 to NiO is shown in Figure 4.26. The sulfur was removed in two temperature regions, 390-490°C and 690-7S5°C. After cooling the system back to 100°C, a hydrogen-argon atmosphere was introduced and the NiO was reduced to nickel metal. 

In a vacuum, uncoated molybdenum metal has an unlimited life at high temperatures. This is also tme under the vacuum-like conditions of outer space. Pure hydrogen, argon, and hehum atmospheres are completely inert to molybdenum at all temperatures, whereas water vapor, sulfur dioxide, and nitrous and nitric oxides have an oxidizing action at elevated temperatures. Molybdenum is relatively inert to carbon dioxide, ammonia, and nitrogen atmospheres up to about 1100°C a superficial nitride film may be formed at higher temperatures in the latter two gases. Hydrocarbons and carbon monoxide may carburize molybdenum at temperatures above 1100°C. 

The titanium tetrachloride should be clean, colorless, and free of hydrogen chloride. The checkers used material freshly distilled in an argon atmosphere. 

MOCVD has also been used with triethyl boron as the boron source in a hydrogen and argon atmosphere ]... 

In a study of thermal stability and hydrogen sorption characteristics of a series of sorbent tablets composed of hydride-forming metals dispersed in polymers under a 50% hydrogen in argon atmosphere, it was found that tablets of 80% palladium in PTFE, and 80% of 1 5 atom lanthanum-nickel alloy in PTFE could not be used above 247° C because of explosive decomposition of the PTFE. 

Jacquemin, J. et al.. Solubility of carbon dioxide, ethane, methane, oxygen, nitrogen, hydrogen, argon, and carbon monoxide in l-butyl-3-methylimidazolium tetrafluoroborate between temperatures 283 K and 343 K and at pressures close to atmospheric, /. Chem. Thermodyn., 38, 490, 2006. 

These authors found that it was possible to deposit amorphous films whose Ta concentration ranged from 10 to 80 mol % by changing the reactive gas mix. Another feature of the films was that under certain conditions they contained substantial quantities of chlorine and hydrogen. Also, they did not adhere to either silicon or silicon dioxide after annealing (argon atmosphere for 1 hour at 900°C). When the substrates were dry etched in an HCI plasma for 2 minutes, they adhered to the substrate even after annealing. Since this etch removed about 50 A, it appears that the native oxide on the silicon and/or some other surface impurities on both the silicon and silicon dioxide were causing the lack of adhesion. 

All work with hydrogenation products was spent in an argon atmosphere of the high cleanliness. 

Octakis[f-butyl]-l,2,3,4,5-telluratetrastannolane1 All operations are performed under an argon atmosphere with oxygen-free solvents. Hydrogen telluride is passed for 1 h through a solution of 5.0 g (4.2 mmol) of 1,4-diiodo-l, 1,2,2,3,3,4,4-octakis[f-butyl]tetrastannane n a mixture of 100 ml of toluene and 1 ml of triethylamine. The mixture is then filtered to remove precipitated triethylammonium iodide, the solvent is evaporated from the filtrate, and the residue is recrystallized from chloroform/hexane yield 2.4 g (55%) m.p. 170° (dec.). 

Octaphenyl-l,2,3,4,5-telluratetragerinolane3 A red, elhanolic solution of sodium hydrogen telluride is added dropwise to a solution of 1.0 g (0.86 mmol) of 1,4-diiodo-l, 1,2,2,3,3,4,4-octaphenyltetra-germane in 15 m/ of benzene under an argon atmosphere until the red color just persists. The mixture is filtered, the filtrate is concentrated, and the residue is dissolved in benzene. Diethyl ether is added to the benzene solution until the product crystallizes. The product is filtered and stored under argon. The colorless crystals decompose on contact with air and at 50° when heated under argon. 

Chloro-3-cyano-4,6-diphcnylpyridinc reacted with sodium hydrogen telluride in ethanol under an argon atmosphere to produce a cyclic telluronocarboxylic amide (tellurolocar-boxylic imide)1. 

The sodium compound begins to decompose under an argon atmosphere at 165°, while the potassium compound begins to decompose at about 230°. Both of these compounds are considerably more stable than solid Li[GaH4] which is reported5 to lose hydrogen rapidly at 70°. 

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