Crystallization kinetics of bioactive glasses in the ZnO-Na2O-CaO-SiO2 system.
作者： Gianluca Malavasi , Gigliola Lusvardi , Alfonso Pedone , Maria Cristina Menziani , Monica Dappiaggi
DOI: 10.1021/JP071528U
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摘要: The crystallization kinetics of Na2O·CaO·2SiO2 (x = 0) and 0.68ZnO·Na2O·CaO·2SiO2 0.68, where x is the ZnO stoichiometric coefficient in glass formula) bioactive glasses have been studied using both nonisothermal isothermal methods. results obtained from XRPD analyses showed that first crystallizes into isochemical Na2CaSi2O6 phase, whereas Na2ZnSiO4 crystalline phase Zn-rich glass, addition to Na2CaSi2O6. activation energy (Ea) for 193 ± 10 203 5 kJ/mol situ DSC experiments, respectively. Avrami exponent n determined method 1 at low temperature (530 °C), its value increases linearly with increase up 2 607 °C. For Zn-containing higher values (667 661 °C) Ea (223 211 kJ/...
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