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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effect of P2O5 on the early stage crystallization of K-fluorrichterite glass-ceramics
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Effect of P2O5 on the early stage crystallization of K-fluorrichterite glass-ceramics

机译：P2O5对K-萤石玻璃陶瓷早期结晶的影响

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摘要

The addition of 2 mol% P2O5 to stoichiometric K-fluorrichterite (KNaCaMg5Si8O22F2, KFR) has been reported to enhance the mechanical properties and improve the in vitro biocompatibility of this glass-ceramic by promoting the formation of enstatite and fluorapatite (FA). Here, the effect of further increasing the P2O5 concentration on phase evolution of KFR has been investigated. XRD data showed that mica crystallized in samples with 4 and 5 mol% P2O5 (GP4 and GP5, respectively) at 650 degrees C, but no diopside was detected at higher temperatures, in contrast with the general phase evolution in KFR based glass-ceramics. More importantly, however, the addition of >= 4 mol% P2O5 induced phase separation of the glass into a silica glass matrix and phosphate rich droplets prior to crystallization. EDS traces taken from samples heat-treated at 600 degrees C, revealed that the silica glass matrix was deficient in Mg and unlikely to be the host for crystallization of mica. Conversely, the P2O5 rich regions contained excess Mg and were considered to be the host for the formation of mica and FA. (C) 2008 Elsevier B.V. All rights reserved.
机译：据报道，向化学计量的K-萤石（KNaCaMg5Si8O22F2，KFR）中添加2 mol％P2O5可通过促进顽辉石和氟磷灰石（FA）的形成来增强该玻璃陶瓷的机械性能并改善其体外生物相容性。在这里，已经研究了进一步增加P2O5浓度对KFR相演变的影响。 XRD数据显示，在650℃下，云母在含有4和5 mol％P2O5（分别为GP4和GP5）的样品中结晶，但在较高的温度下未检测到透辉石，这与基于KFR的玻璃陶瓷的一般相演化相反。但是，更重要的是，在结晶之前，添加≥4 mol％的P2O5可以将玻璃相分离成二氧化硅玻璃基质和富含磷酸盐的液滴。从在600摄氏度下进行了热处理的样品中获得的EDS痕迹表明，石英玻璃基质中的Mg不足，不太可能成为云母结晶的基质。相反，富含P2O5的区域含有过量的Mg，被认为是形成云母和FA的主体。 （C）2008 Elsevier B.V.保留所有权利。

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