Die Ampulle A wird anschlieBend abgenomrnen und statt ihrer das Kolbchen S mit dem Zwischenstuck 5 aufgesetzt. S enthalt zwischen 50 bis 100 mg von der zu m a rk i e r e n d e n S u b s t a n z , die in Wasser oder alkoholischer Losung eingebracht und bei fortwahrendem Drehen irn Wasserstrahlpumpenvakuurn vom Losungsmittel befreit wurde. Die Substanz bleibt als dunner Film auf der Glaswandung zuriick. Durch Iangeres Evakuieren auf Hochvakuurn wird wieder die Dichtheit der neu angesetzten
The thermal decomposition of FSOOSFB, P, in the presence of CO has been investigated between 130.1" and 161.9"C at total pressures between 50 and 600 torr. The reaction is homogeneous, and the only final products formed are C02 and S2F10. The rate of reaction is proportional to the pressure of P. The partial pressures of CO and 0 2 and the total pressure have no influence on the course of reaction:The results are explained by the following mechanism:(1) P = 2 OSFs rate-determining step (la) OSF5 + CO = C02 + SF5 fast reaction (Ib) 2 SFS = S2F10
The metallic glass Zr65Al7.5Cu27.5 exhibits a wide temperature range in the undercooled liquid region. This offers the possibility of examining the phenomena that occur during glass transition. We investigated this glass by x-ray diffraction and x-ray absorption spectroscopy (XAS) at room temperature and at elevated temperatures below and above the glass transition temperature. The total number of nearest neighbors determined by x-ray diffraction remained unchanged. Using XAS irreversible changes in the short range order (SRO) towards the SRO of crystalline Zr2Cu is observed in the nearest neighbor shell which is consistent with the x-ray diffraction results. The long range order was not affected by these changes. From the temperature dependence of the atomic mean-square relative displacements σ2, Debye temperatures were determined and they compare well with low temperature specific heat measurements. Above Tg the slope of σ2 increases drastically and is attributed to anharmonic effects.
The kinetics of the thermal decomposition of CF303CF3 has been investigated in the pressure range of 15599 torr at temperatures between 59.8 and 90.3OC and also in the presence of CO between 42 and 7°C. The reaction is homogeneous. In the absence of CO the only reaction products are CF302CF3 and 0 2 . The rate of reaction is strictly proportional to the trioxide pressure, and is not affected by the total pressure, the presence of inert gases, and oxygen.The following mechanism explains the experimental results:(1)In the presence of CO there appear COz, (CF30C0)2, and CF302C(O)OCF3 as products.With increasing temperature the amount of peroxicarbonate decreases, while the amounts of oxalate and COz increase. The rate of decomposition of the trioxide above a limiting pressure of about 10 torr CO is strictly first order and independent of CO pressure, total pressure, and the pressure of the products.International Journal of Chemical Kinetics, Vol. 13, 639-649 (1981)
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