Evidence for Al/Si tetrahedral network is aluminosilicate glasses from AlK-edge x-ray-absorption spectroscopy

被引:34
作者
Wu, ZY [1 ]
Romano, C
Marcelli, A
Mottana, A
Cibin, G
Della Ventura, G
Giuli, G
Courtial, P
Dingwell, DB
机构
[1] CEA Saclay, CNRS, Lab Pierre Sue, F-91191 Gif Sur Yvette, France
[2] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[3] Univ Roma Tre, Dipartimento Sci Geol, I-00146 Rome, Italy
[4] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany
[5] Univ Roma Tre, Dipartimento Sci Geol, I-00146 Rome, Italy
[6] Univ Calabria, Dipartimento Sci Terra, I-87036 Cosenza, Italy
[7] Univ Florence, Dottorato Ric Sci Mineral, I-50121 Florence, Italy
关键词
D O I
10.1103/PhysRevB.60.9216
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The structure of aluminosilicate melts and/or glasses plays a key role in the earth sciences for the understanding of rock-forming igneous processes, as well as in the materials sciences for their technical applications. In particular, the alkaline-earth aluminosilicate glasses are an extremely important group of materials, with a wide range of commercial application, as well as serving as an analog for natural basaltic melts. However, definition of their structure and properties is still controversial, and in particular the role and effect of Al has long been a subject of debate. Here we report a series of experimental x-ray absorption near-edge structure spectra at the Al K edge on a series of synthetic glasses of peralkaline composition in the CaO-Al2O3-SiO2 system, together with a general theoretical framework for data analysis based on an nb initio full multiple-scattering theory. We propose an Al/Si tetrahedral network model for aluminosilicate glasses based on distorted polyhedra, with varying both the T-O (T=Al or Si) bond lengths and the T-O-T angles, and with different Al/Si composition. This model achieves a significant agreement between experiments and simulations. In these glasses, experimental data and theoretical results concur to support a model in which Al is network former with a comparatively well ordered local medium-range order (up to 5 Angstrom). [S0163-1829(99)09833-1].
引用
收藏
页码:9216 / 9219
页数:4
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