Zr environment in aluminosilicate glasses Zr environment and nucleation role in aluminosilicate glasses
Zr environment in aluminosilicate glasses Zr environment and nucleation role in aluminosilicate glasses
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铝硅酸盐玻璃中的Zr环境 铝硅酸盐玻璃中的Zr环境及成核作用
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发表时间：
2020
期刊：
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通讯作者：
A. Cognigni
中科院分区：
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作者：
L. Cormier;Olivier Dargaud;G. Calas;C. Jousseaume;Sophie Papin;N. Trcera;A. Cognigni
：我们研究了 ZrO 2 对铝硅酸盐玻璃成核/结晶性能的作用。无Zr和含Zr玻璃之间的比较表明，添加ZrO 2 有利于含Li、Mg、Ca和Zn玻璃的成核，而对含Na玻璃没有影响。 Zr环境已通过Zr K-和L 2,3 -边缘的耦合X射线吸收光谱得到阐明。 Zr环境对应于六重配位点（Li和Na玻璃）和七重配位点（Mg、Ca和Zn玻璃），表明配位数对结晶能力影响很小。除含 Na 玻璃外，所有玻璃均观察到直接的 Zr-Zr 多面体连接。由于没有观察到局部 Zr 位点与其促进成核的能力之间的相关性，因此 Zr 成核作用的起源被解释为 Zr 与铝硅酸盐基质的分布所致。含Na玻璃的结晶能力差是由于缺乏直接的Zr-Zr键。中等范围有序性是解释含锆玻璃性能的关键参数。
: We have investigated the role of ZrO 2 on the nucleation/crystallization properties of aluminosilicate glasses. A comparison between Zr-free and Zr-bearing glasses shows that adding ZrO 2 favors nucleation in Li-, Mg-, Ca- and Zn-bearing glasses and has no effects in Na-bearing glasses. The Zr environment has been elucidated coupling X-ray absorption spectroscopy at both Zr K- and L 2,3 -edges. The Zr environment corresponds to six-fold coordinated sites (Li and Na glasses) and seven-fold coordinated sites (Mg, Ca and Zn glasses), indicating the coordination number has little influence on the ability to crystallize. Direct Zr-Zr polyhedral linkages are observed for all glasses except the Na-bearing one. Since no correlation between the local Zr site and its ability to promote nucleation can be observed, the origin of the nucleating role of Zr has been interpreted as resulting from the Zr distribution with the aluminosilicate matrix. The poor crystallization ability for Na-bearing glasses is due to the lack of direct Zr-Zr linkages. Medium range ordering appears as a key parameter to explain properties of Zr-bearing glasses.