Care, education, social adaptation: from the history of education in Russia Pushkin era

A Porous Tungsten Substrate for Catalytic Reduction of Hydrogen by Dealloying of a Tungsten–Rhenium Alloy in an Aqueous Solution of Hydrochloric Acid

“…A thermodynamic vacancy mechanism of this process has been developed for lowtemperature electrolytes [33]. Based on the Darken dependence of the logarithm of the mutual diffusion coefficient from the inverse temperature, the value of the self-diffusion coefficient at 298K is estimated.…”

“…To quantitatively characterize the type of destruction of intermetallic phases, the coefficient of selective dissolution Z A was used, which shows how many times the ratio of the amounts of tungsten to rhenium in the electrolyte solution was greater than the corresponding ratio in the alloy. With uniform dissolution, this coefficient is equal to unity, and with selective dissolution, it tends to infinity (tungsten transfers into the solution) or to zero (rhenium transfers into the solution) [33]. According to the obtained experimental data, the selectivity coefficient and the rate of linear loss of the alloy were calculated (Table 3).…”