부산대학교 도서관

Relationships for calculating the viscosity of boron oxide and binary borate melts in the range 101–1013 P have been proposed. The temperature dependence of the viscosity is described by the equation log η= –3.5 + [β/(log T –log θ0 )]1/n. The parameters of the equation are calculated from the composition by the empirical formulas. The model proposed takes into account the shift of chemical equilibria in a melt. The principle of summation of the fluidities associated with the mobility of different structural units is used in calculating the viscosity over a wide range of component concentrations. The mean error in calculations of the characteristic temperatures is equal to ∼20 K in the glass transition range and 30–40 K in the range of low viscosities.