Devitrification behaviour of CaO center dot 0.1P(2)O(5)center dot 0.9SiO(2) glass

被引：5

作者：

Costantini, A

Fresa, R

Buri, A

Branda, F

机构：

[1] Dipto. Ingegneria Materiali Prod., Univ. Federico II di Napoli, Napoli, P.le Tecchio

来源：

THERMOCHIMICA ACTA | 1996年 / 280卷

关键词：

bioactive glasses; CaO center dot 0.1P(2)O(5)center dot 0.9SiO(2) glass; CaO center dot SiO2 glass; crystal growth activation energy; DTA; non-isothermal devitrification; surface nucleation; viscous flow activation energy; X-ray diffraction;

D O I：

10.1016/0040-6031(95)02645-2

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this paper the non-isothermal devitrification of a glass of composition CaO . 0.1P(2)O(5) . 0.9SiO(2) has been studied. Comparison with literature data about the glass CaO . SiO2 enables discussion of the influence of the equimolar substitution of P2O5 for SiO2. The crystal growth activation energy is E(c) = 128 +/- 14 Kcalmol(-1) and is lower than that for CaO . SiO2. The experimental results suggest that this effect can be linked to an analogous compositional effect on the viscous how activation energy. A surface nucleation mechanism is operative as in the case of the parent glass CaO . SiO2. However the nucleation rates would be reduced as a result of the need for diffusion in the non-stoichiometric glass.

引用

页码：237 / 242

页数：6

共 13 条

[1] RELATIONSHIP BETWEEN DTA PEAK AND MAXIMUM REACTION RATE [J].