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Résumé  

Nous avons élaboré une méthode d'analyse par activation neutronique de 24 microimpuretés dans l'argent. Pour éliminer la matrice et séparer les impuretés, nous avons utilisé l'extraction. Nous avons évalué théoriquement et vérifié expérimentalement l'effet d'écran des échantillons d'argent sur le flux de neutrons.

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The dissociation of carbonate materials under a high heating rate has been studied by means of specially constructed original apparatus which allows avoidance of the influence of gas diffusion on the decarbonation process, and acceleration of the measurements.

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The appearance of the compensation effect (logA=a+bE) in non-isothermal kinetics of solid-phase reactions is discussed.

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An automated system of thermal analysis is described for the study of fast exothermic reactions (intensive burning, self-inflammation, transition from the non-equilibrium state to the equilibrium state, etc.). The system includes a complex of technical means for connecting the measuring instrument with the computer (hardware), and a special mathematical supply (software).

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Journal of Thermal Analysis and Calorimetry
Authors:
A. V. Nikolaev
,
A. A. Opalovsky
,
V. E. Fedorov
, and
T. D. Fedotova

Data are presented on the properties of alkali metal and alkaline earth hydrofluorides. Melting, thermal decomposition and interaction of hydrofluorides with various classes of inorganic substances are discussed. Some regularities of changes in thermal properties within the sequences of the above hydrofluorides are established. Future directions of research in this field are outlined.

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