Science of Sintering 2011 Volume 43, Issue 1, Pages: 47-53
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The effect of K2O on the crystallization of niobium germanate glasses
Matijašević S.D., Tošić M.B., Grujić S.R., Stojanović J.N., Živanović V.D., Nikolić J.D.
The effect of K2O content on the crystallization of niobium germanate glasses
with 22.7- 24.27 wt% of GeO2 and 54.59-57.48 wt% of Nb2O5 was examined. The
glasses crystallize by primary crystallization and the formed crystalline
phases were K6Nb6Ge4O26, K3.8Nb5Ge3O20.4 and KNbO3. Increasing the K2O
content caused a decrease in the GeO2 content of the primary phases. The
effect of the K2O content on the kinetics of primary crystallization was
analyzed. It was demonstrated that an increase of the K2O content decreased
the activation energy of crystal growth at first of the crystallization peaks
(Ec1). At second crystallization peaks the activation energies of crystal
growth increased (Ec2).
Keywords: crystallization, kinetics, niobium germanate glasses
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