ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 51, (2) 112 - 118 (2007)

Živanovič Vladimir D. 1, Tošić Mihajlo B. 1, Blagojević Nikola S. 2, Grujić Snežana R. 2, Mitrović Mićo M. 3
1 Institute for the Technology of Nuclear and Other Mineral Raw Materials, 86 Franchet d, Esperey, 110 00 Belgrade, Serbia
2 Faculty of Technology and Metallurgy, 4 Karnegijeva, 110 00 Belgrade, Serbia
3 Faculty of Physics , 12-16 Akademski Trg, 110 00 Belgrade, Serbia

Keywords: Phosphate glass, Vanadium oxide, Crystallisation

The crystallisation behaviour of calcium phosphate glass containing vanadium oxide was studied. Glass with a molar ratio of [CaO]/[P₂O₅] = 1.13 and a V₂O₅ content of 8 mol.% was prepared for the experiments. The crystallisation of bulk glass samples was performed under isothermal conditions at T = 650-820°C. The surface crystallisation mechanism of studied glass with dendritic growth of the primary α-Ca₂P₂O₇ phase was observed. In all crystallised samples, β-Ca₂P₂O₇ and VP₂O₇ appeared as the secondary phases. In the investigated temperature range, crystal growth rates 9 × 10⁻⁹ - 2.14 × 10⁻⁶ m/s were determined. The temperature dependence of the crystal growth rate makes possible to calculate activation energy Ea = 407 ± 30 kJ/mol of crystallization. The experimental data were compared with those estimated by using a theoretical model of the crystal growth rate and good agreement between the results was found.

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