NUCLEATION BEHAVIOUR OF K2O-TiO2-3GeO2 UNDERCOOLED MELT

NUCLEATION BEHAVIOUR OF K2O-TiO2-3GeO2 UNDERCOOLED MELT

The nucleation of K2TiGe3O9 crystals in an under-cooled melt of stoichiometric composition was studied. Volume nucleatio n with spherical morphology of the growing crystals was dete rmined. The nucleation range was in the temperature interval 540-630 C. A maximum of the steady state nucleation rate...

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Veröffentlicht in:Ceramics (Praha) 2009-01, Vol.53 (2)
Hauptverfasser: Grujic, S R, Blagojevic, N S, Tosic, M B, Zivanovic, V, Nikolic, J D
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creator Grujic, S R
Blagojevic, N S
Tosic, M B
Zivanovic, V
Nikolic, J D
description The nucleation of K2TiGe3O9 crystals in an under-cooled melt of stoichiometric composition was studied. Volume nucleatio n with spherical morphology of the growing crystals was dete rmined. The nucleation range was in the temperature interval 540-630 C. A maximum of the steady state nucleation rate of Imax = 1.4x10exp(15)/m3/s was determined at the temperature of maximum nucleation rate = 582 C. The temperature and tim e dependence of the nucleation rate was analyzed and it was shown that such nucleation behaviour was the result of a low thermodynamic and kinetic barrier. The temperature interval s of nucleation and crystal growth of this under-cooled melt partly overlapped. 27refs.
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