Magnetometric Studies of Catalyst Refuses in Nanocarbon Materials

It is shown that magnetometry can be employed as an effective tool to control the content of a ferromagnetic constituent in nanocarbon materials. We propose a thermochemical treatment protocol to achieve extensive cleaning of the source nanocarbon materials from ferromagnetic refuses.     

Transport Properties of Ga-Doped PbTe Thin Films on Si Substrates

Thin PbTe films on Si substrates were doped with Ga via annealing in the vapor produced by heating a Ga(l) + GaTe(s) mixture (GaTe(s) + L ₁+ Vequilibrium). Electrical measurements showed that the vapor-phase doping reduced the hole concentration in the films by more than two orders of magnitude. IR irradiation was found to reduce the resistivity of the PbTe films by a factor of 40–100. The films annealed in the vapor over GaTe(s) + L ₁for the longest time exhibited an anomalous temperature variation of resistance, which was interpreted as due to the limited Ga solubility in PbTe.     

Ice Melting and Crystallization in Binary Water–Salt Systems

Correlations are revealed between the phase diagrams of water–salt systems, the crystallization and melting behaviors of ice in such systems, and the physicochemical properties of Group I and II chlorides and sulfates (cation radius and heat of solution in water). It is shown that kinetic studies of ice melting may yield further insight into the mechanisms of phase transformations and component distribution in different aqueous systems.     

Intensification of Sintering of Calcium-Bearing Ceramic Mixtures

The specifics of intensification of the sintering process in faience mixtures with an increased content of high-calcium waste were investigated upon introduction of various mineralizers. It was determined that sintering is intensified when the process mainly occurs in the solid phase with the RO : R₂O ratio equal to 7 – 9.     

One-coat low-melting-point white vitreous enamels for household gas appliances

One-coat white vitreous enamels for the housings of household gas appliances were developed. The enamels are fired at 550–675°C. The influence of the enamel composition on reflectance and gloss was assessed. Translated from Steklo i Keramika, No. 1, pp. 29–30, January, 1997.