Inhomogeneous distribution of Na+ in alkali silicate glasses

被引：15

作者：

Tokuda, Yomei ^{[1
]}

Oka, Takanori ^{[1
]}

Takahashi, Masahide ^{[1
]}

Yoko, Toshinobu ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

来源：

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 2011年 / 119卷 / 1396期

关键词：

Sodium silicate; Mixed alkali; MQMAS NMR; Quantum chemical calculation; Na+ elution behavior; Inhomogeneous distribution; NUCLEAR-MAGNETIC-RESONANCE; OXIDE GLASSES; ION-TRANSPORT; MAS-NMR; CATION DISTRIBUTION; DISILICATE GLASSES; MOLECULAR-DYNAMICS; CHEMICAL-SHIFTS; BOND DISTANCE; SPECTROSCOPY;

D O I：

10.2109/jcersj2.119.909

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We investigated the Na+ environment in sodium silicate glasses and mixed alkali silicate glasses using Na-23 multiple-quantum magic-angle spinning (MQMAS) NMR spectroscopy, ab initio molecular orbital (MO) calculations, and Na+ elution analysis. The Na-23 MQMAS NMR spectra of Na2O-xSiO(2) and (1 - y)Na2O-yM(2)O-2SiO(2) (M = Li, K) glasses showed an inhomogeneous distribution of local structures around Na+, even though spectral deconvolution was impossible. The quantum chemical calculations indicated that the alkali silicate glasses contained both aggregated and isolated Na+ sites. The elution behavior also supported the local structure distribution described above. These results indicated that a cation with a high cation field strength tends to aggregate in mixed silicate glasses. (C)2011 The Ceramic Society of Japan. All rights reserved.

引用

页码：909 / 915

页数：7

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