Viscosity of sodium borate melts containing mechanically activated additions of heavy lanthanides oxides

 S.A. Istomin, V. V. Ryabov, A. A. Khokhryakov, A. V. Ivanov, N. V. Korchemkina

ABSTRACT:

Viscosity (η) of sodiumborate melts, containing 1 wt % of mechanically activated oxides of heavy lanthanides (Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu), was measured by vibrating viscometer in a temperature range  of 950–1650 K. The temperature and concentration dependences of the viscosity values as well as the initial temperature of  the melts solidification were defined. The dependences of the  viscosity logarithm  on temperature feedback revealed high and low temperature ranges with different activation energy of viscous flow. It was revealed that the obained results were related to the structure of investigated melts.

KEYWORDS:

 viscosity, melt, boron oxide, oxides of rare earth elements,  sodium oxide, mechanical activation.