Estimation of Molar Volume for Multicomponent Silicate Melts

Viscosity models for silicate melts

Rheology of silicates (melts or super cooled as glasses) is one of the most important fields to mankind, as geological activity largely influences life. In this paper, unifying empirical models for the Non-Newtonian shear viscosity and the extensional viscosity are proposed. The models have only one parameter, the zero shear viscosity (the Newtonian plateau), and are valid for a vide range of c...

Melt densities in the CaO-FeO-Fez03-SiOz system and the compositional partial molar volume of ferric iron in silicate melts dependence of the

The densities of 10 melts in the CaO-FeO-Fe20,-Si02 system were determined in equilibrium with air, in the temperature range of I200 to 1550°C. using the double-bob Archimedean technique. Melt compositions range from 6 lo 58 wt% SK&, 14 lo 76 wt% Fe20j and 10 lo 46 wt% CaO. The ferric-ferrous tatios of glasses drop-quenched from loop fusion equilibration experiments were determined by “Fe Mhbau...

Geological Notes Diffusion of Water in Silicate Melts

The transport of water in silicate melts is examined from a theoretical point of view, taking into account the presence of both H20 and OH species. It was assumed that only H20 molecules may diffuse and that a constitutive relationship between the number density nH 0 of H20 molecules and the total water content (n:E) exists such that nH,o = g(n:E) . This is related to dissociation or to chemica...

Parallel excluded volume tempering for polymer melts.

We have developed a technique to accelerate the acquisition of effectively uncorrelated configurations for off-lattice models of dense polymer melts that makes use of both parallel tempering and large-scale Monte Carlo moves. The method is based upon simulating a set of systems in parallel, each of which has a slightly different repulsive core potential, such that a thermodynamic path from full...

Diffusion of H, C, and O Components in Silicate Melts