Antimony hydride

Stannic and stannous, see under Tin Stibine, see Antimony hydride Stibnite, see Antimony(III) sulflde Stolzite, see Lead tungstate(VI)(2—)... 

Stibine, see Antimony hydride Stoddard solvent Strontium chromate Strychnine Styrene, monomer Subtilisins (proteolitic enzymes as 100% pure crystalline enzyme)... 

Antimony hydride (Stibine) (SbH3) Rapid Very slow... 

Antimon-saure, /. antimonic acid, -saureanhy-drid, n. antimonic anhydride, antimony pent-oxide. -silber, n. antimonial silver, dyscrasite. -silberblende,/. pyrargyrite. -silberglanz, m. stephanite. -spiegel, m. antimony mirror, -sulfid, n. antimony sulfide, specif, antimony pentasulfide, antimony(V) sulfide, -sulfiir, n. antimony trisulfide, antimony(III) sulfide, -yerblndung,/. antimony compound, -wasser--stoff, m. antimony hydride, stibine. -weiss, n. antimony white (Sb Oa). -zinnober, m. kermes mineral. 

Propyleneimine Selenium hexafluoride Stibine (antimony hydride)... 

From general considerations it should be mentioned that only atoms of hydrogen can be present in gaseous phase in addition to atoms of antimony, molecules of antimony hydride and antimony hydride radicals in this system. Therefore, it is necessary to analyze plausible effects of each of above particles on conductivity of semiconductor sensor under experimental conditions. 

Fig. 6.3. The effect of antimony hydride on conductivity of the sensor. The temperature of the sensor is 23 C, at moment of time t= 5 min hydride was introduced.

Figure 6.4 shows the change in the sensor conductivity as a function of temperature. Curve / shows the dependence of sensor resistivity with temperature when the sensor is positioned in evacuated installation. The introduction of antimony hydride was made at temperature - 75°C bringing about no change in resistivity. When the temperature of the sensor was increased up to - 20 C there were no effects detected on its resistivity caused by antimony hydride. Only at higher temperatures one can observe deviation of dependence RiT) from curve 1 which is caused by decomposition of SbHa on ZnO. These results led to experiments on emission of H-atoms in a special vial when Sb-film treated by H-atoms was kept at a room temperature and sensors were kept at the temperature of - 80 C. Under these conditions, as is shown by above reasoning. 

Therefore, as a result of a series of experiments and analyzing the literature sources we proved that in experiment shown in Fig. 6.2 the signals of the sensor cannot be related to effects of antimony hydride. 

The kinetics of the thermally induced homogeneous decomposition of phosphine (PH3) have not yet been studied. The species PH2, PH and P2 are formed on flash photolysis of PH3 and could be identified by their absorption spectra63. There are proposals as to the mechanism of the consecutive process after the photochemical primary step, but nothing is known about the kinetic parameters of these reactions. With arsine and antimony hydride only the heterogeneous decomposition has been studied64,65. 

Brom the composition of this compound, and from that of some of its analogues, the composition of antimonious hydride is inferred. 

To prepare arsenic hydride, assemble an apparatus as shown in Fig. 140 and perform this experiment as described under the heading Preparation of Antimony Hydride in Sec. 31.2. Write the equations of all the reactions proceeding in this experiment and explain them. 

Compare the properties of antimony hydride with those of similar compounds of arsenic, phosphorus, and nitrogen (the thermal stability, reducing properties, etc.). 

The second is the form of equation which Stock and Bodenstein found to express the rate of decomposition of antimony hydride at 25° C. The value used for n was 0-6. 

The hydrides of phosphorus, arsenic, and antimony thus form an interesting transition series. On similar sorts of surface antimony hydride is the least stable, decomposing with measurable speed at ordinary temperatures, and phosphine is the most stable, not decomposing at an appreciable rate below a red heat. Arsine occupies an intermediate position. At low temperatures the adsorption is considerable, and, as a result, the stibine decomposition requires the pn equation, while the more stable hydrides, which only decompose rapidly at higher temperatures where the adsorption is smaller, obey the unimolecular law. It is interesting, moreover, that with stibine itself the exponent n increases towards unity as the temperature at which the reaction takes place is raised. 

---