Metallurgy, Vol. 42 No. 4, 2003.
Original scientific paper
The Effect of Lanthanides on Viscosity of Re-SI-MG-O-N Glasses
F. Lofaj
F. Dorčáková
Abstract
Compressive creep behavior of RE-Si-Mg-O-N glasses (RE = La, Yb, Sm and Lu) was investigated to determine temperature dependency of their viscosity in temperature range from 770 °C up to 895 °C. Viscosity and heat transfer through the glass (Tg) were increased by > 10 times and by 26 °C, when La is replaced with Lu in the corresponding glasses. Assuming valence Z = +3 and coordination number CN = 6 of the RE ions, Tg depends approximately linearly on cationic field strength except Yb. Tg of Yb-containing glass also falls on linear dependence provided CN = 8 in the case of Yb. Lanthanides seem to modify the structure of the corresponding glasses and bond strength rather than the mechanisms of deformation.
Keywords
Hrčak ID:
128395
URI
Publication date:
1.10.2003.
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