Ceramics-Silikáty 53, (2) 128 - 136 (2009) |
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THE NUCLEATION BEHAVIOR OF K₂O·TiO₂·3GeO₂ UNDERCOOLED MELT
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Grujic Snežana R. 1, Blagojević Nikola S. 1, Tošić Mihajlo B. 2,
Živanović Vladimir D. 2,
Nikolić Jelena D. 2
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1 Faculty of Technology and Metallurgy, 4 Karnegijeva St., 11000 Belgrade, Serbia
2 Institute for Technology of Nuclear and other Mineral Raw Materials, 86 Franchet d’ Esperey, 11000 Belgrade, Serbia
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Keywords: Undercooled melt, Homogenous nucleation, K₂TiGe₃O₉
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The nucleation of K₂TiGe₃O₉ crystals in an undercooled melt of stoichiometric composition was studied. Volume nucleation
with spherical morphology of the growing crystals was determined. The nucleation range is in the temperature interval
540-630°C. A maximum of the steady state nucleation rate of Imax = 1.4×10¹⁵ m⁻³∙s⁻¹ was determined at the temperature
Tn
max = 582°C. The temperature and time dependence of the nucleation rate was analyzed and it was shown that such
a nucleation behavior was the result of a low thermodynamic and kinetic barrier. The results showed that the temperature
intervals of nucleation and crystal growth of this undercooled melt partly overlapped. |
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