Transactions of the INDIAN CERAMIC SOCIETY Vol. 27 1968
Solubility Dependence of Ruthenium Volatilisation
from Glass
K. K. DHARGUPTA AND J. MUKERJI
Pages : 123-129
DOI : 10.1080/0371750X.1968.10855641
Abstract
Solubility dependence of ruthenium volatilisation from glass at glass forming
temperature and the effect of time and temperature on the rate of volatilisation were
investigated. Simple glasses in the system Na20-Si02 were considered for the study.
Volatilisation runs were carried out at different temperatures in an air flow of 118
em/min and the surface of glass subjected to evaporation was 2.73 sq. em.
The plot of ruthenium volatilisation loss vs solubility at 1100°C showed a direct
relation between them upto 38 mole percent Na20 content and the curve was a straight
line passing through the origin with a slope of 1.64 x J0-2 mg/ppm. For the glasses, with
more Na20, volatilisation was believed to depend on solubility as well as on oxygen
diffusion. Volatilisation at different temperatures showed that it followed the Arrhenius
law and the calculated activation energy for evaporation was 18.65 K Caljmole. Rate
of ruthenium volatilisation decreased with time and attained a constant value as soon
as ruthenium lost due to evaporation was made up by more ruthenium entering into
solution.
