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Characterization of autocatalytic decomposition reactions is important
for the safe handling and storage of energetic materials. Isothermal differential
scanning calorimetry (DSC) has been widely used to detect autocatalytic decomposition
of energetic materials. However, isothermal DSC tests are time consuming and
the choice of experimental temperature is crucial. This paper shows that an
automatic pressure tracking calorimeter (APTAC) can be a reliable and efficient
screening tool for the identification of autocatalytic decomposition behavior
of energetic materials.
Hydroxylamine nitrate (HAN) is an important
member of the hydroxylamine family. High concentrations of HAN are used as
liquid propellants, and low concentrations of HAN are used primarily in the
nuclear industry for decontamination of equipment. Because of its instability
and autocatalytic decomposition behavior, HAN has been involved in several
incidents. 相似文献
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Several magnetic and optical processes contribute to the magneto-optical response of nickel thin films after excitation by a femtosecond laser pulse. We achieved a first complete identification by explicitly measuring the time-resolved Kerr ellipticity and rotation, as well as its temperature and magnetic field dependence in epitaxially grown (111) and (001) oriented Cu/Ni/Cu wedges. The first hundreds of femtoseconds the response is dominated by state filling effects. The true demagnetization takes approximately 0.5-1 ps. At the longer (sub-ns) time scales the spins are found to precess in their anisotropy field. Simple and transparent models are introduced to substantiate our interpretation. 相似文献
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121Sb Mössbauer spectra of SbCl5-graphite have been obtained. The spectra provide clear evidence for the presence of the acceptor molecular ion SbCl6-(Sb5+ and neutral SbCl3(Sb3+ in the intercalate layers, with weak evidence for neutral intercalated SbCl5. Lineshape analyses of the Sb3+ region of the spectra further indicate that two chemical Sb3+ sites fit the data significantly better than one site. We attribute the second Sb3+ site to SbCl4- and find the concentration ratio [SbCl4-]/[SbCl3] 0.25. Samples prepared by the reaction of graphite with vapor mixtures of SbCl5 and SbCl3 were found to exhibit dramatically higher concentrations of SbCl3 than those samples prepared from a reaction with SbCl5 alone. This latter result is interesting in view of the fact that the reaction of graphite with SbCl3 vapor does not lead to an intercalation compound. 相似文献
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