Investigation of medium range order in silicate glasses by infrared spectroscopy

被引：33

作者：

Meneses, Domingos De Sousa ^{[1
,2
]}

Eckes, Myriam ^{[1
]}

del Campo, Leire ^{[1
,2
]}

Santos, Cristiane N. ^{[3
]}

Vaills, Yann ^{[1
,2
]}

Echegut, Patrick ^{[1
]}

机构：

[1] CNRS, CEMHTI UPR3079, F-45071 Orleans 2, France

[2] Univ Orleans, Polytech Orleans, F-45067 Orleans 2, France

[3] Catholic Univ Louvain, IMCN NAPS, B-1348 Louvain, Belgium

来源：

VIBRATIONAL SPECTROSCOPY | 2013年 / 65卷

关键词：

Potassium silicate glass; Infrared spectroscopy; Medium range order; NEUTRON-DIFFRACTION; DYNAMICS; MODES; CRISTOBALITE; CONNECTIVITY; CRYSTALLINE; SPECIATION; SIMULATION; SPECTRA; NMR;

D O I：

10.1016/j.vibspec.2012.11.015

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new decomposition method of infrared spectra which takes into account the configurational and dynamical origins of the disorder allows retrieving structural information on short and medium range orders in potassium silicate glasses. The distribution of tetrahedral units, the occupation of cation sites, the ratio of Si-O bond ionicities involving bridging and non bridging oxygen, and a measure of the impact of low frequency floppy modes on the high frequency dynamics are byproducts of the modeling process. The composition dependence of two vibrational modes clearly identified as spectral components signing medium range order, shows that the disruption of the silicate network follows selective schemes. The 3D silica like network completely disappears in glasses with K2O amounts greater than 11 mol% and above this threshold a progressive appearance of 2D silicate sheets is evidenced. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：50 / 57

页数：8

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