Viscosity of sodium-breast melts containing mechanoactive oxides samarium, europia, erbia and thulium

A. V. Ivanov, V. V. Ryabov. 

ABSTRACT

Using a vibrational viscometer, the viscosity values (η) of sodium-borate melts containing 1 wt % mechanically activated lanthanide oxides (Sm₂O₃, Eu₂O₃, Er₂O₃, Tm₂O₃) in the temperature range of 950–1650 K. The laws of viscosity changes in temperature and composition are established, the temperatures of the onset of solidification of the studied melts are determined. The dependences of the logarithm of viscosity on the inverse temperature revealed high and low temperature regions with different activation energies of the viscous flow. The patterns of viscosity change are explained in terms of changes in the structure of the melt.

KEYWORDS:

viscosity, melt, boron oxide, rare earth oxides, sodium oxide, mechanical activation, melt structure

DOI: 10.31857/S0235010620040052