29Si MAS NMR investigation of the Na2O-Al2O3-SiO2 glasses

Hideki Maekawa, Takashi Maekawa, Katsuyuki Kawamura, Toshio Yokokawa

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

29Si nuclear magnetic resonance (MAS NMR) on sodium aluminosilicate glasses with composition range of [Na]/[Al] ≥ 1 were investigated. Line shapes and chemical shifts suggested that numbers of nonbridging oxygen atoms increase linearly with ([Na] - [Al])/[Si], in agreement with the classical structural model. An addition of alumina into sodium silicate glasses caused 29Si chemical shift to lower field (less shielded) and increment of line width of Qn peaks with higher n value, where Qn represents the SiO4 tetrahedron with n bridging oxygen atoms connected to adjacent Si atom. It was suggested that aluminum atom tends to be coordinated with SiO4 tetrahedra of most polymerized states. The reaction between Qn structure units, 2Qn ⇌ Qn-1 + Qn+1, seemed to proceed to the left direction with increasing aluminum oxide contents as NaAlO2 into the sodium silicate glass.

Original languageEnglish
Pages (from-to)6822-6827
Number of pages6
JournalJournal of Physical Chemistry
Volume95
Issue number18
Publication statusPublished - 1991
Externally publishedYes

Fingerprint

sodium silicates
Nuclear magnetic resonance
tetrahedrons
Glass
Atoms
nuclear magnetic resonance
chemical equilibrium
Aluminum Oxide
glass
oxygen atoms
Sodium
Chemical shift
aluminum oxides
Silicates
Oxygen
Aluminum
atoms
line shape
Aluminosilicates
sodium

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Maekawa, H., Maekawa, T., Kawamura, K., & Yokokawa, T. (1991). 29Si MAS NMR investigation of the Na2O-Al2O3-SiO2 glasses. Journal of Physical Chemistry, 95(18), 6822-6827.

29Si MAS NMR investigation of the Na2O-Al2O3-SiO2 glasses. / Maekawa, Hideki; Maekawa, Takashi; Kawamura, Katsuyuki; Yokokawa, Toshio.

In: Journal of Physical Chemistry, Vol. 95, No. 18, 1991, p. 6822-6827.

Research output: Contribution to journalArticle

Maekawa, H, Maekawa, T, Kawamura, K & Yokokawa, T 1991, '29Si MAS NMR investigation of the Na2O-Al2O3-SiO2 glasses', Journal of Physical Chemistry, vol. 95, no. 18, pp. 6822-6827.
Maekawa H, Maekawa T, Kawamura K, Yokokawa T. 29Si MAS NMR investigation of the Na2O-Al2O3-SiO2 glasses. Journal of Physical Chemistry. 1991;95(18):6822-6827.
Maekawa, Hideki ; Maekawa, Takashi ; Kawamura, Katsuyuki ; Yokokawa, Toshio. / 29Si MAS NMR investigation of the Na2O-Al2O3-SiO2 glasses. In: Journal of Physical Chemistry. 1991 ; Vol. 95, No. 18. pp. 6822-6827.
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AB - 29Si nuclear magnetic resonance (MAS NMR) on sodium aluminosilicate glasses with composition range of [Na]/[Al] ≥ 1 were investigated. Line shapes and chemical shifts suggested that numbers of nonbridging oxygen atoms increase linearly with ([Na] - [Al])/[Si], in agreement with the classical structural model. An addition of alumina into sodium silicate glasses caused 29Si chemical shift to lower field (less shielded) and increment of line width of Qn peaks with higher n value, where Qn represents the SiO4 tetrahedron with n bridging oxygen atoms connected to adjacent Si atom. It was suggested that aluminum atom tends to be coordinated with SiO4 tetrahedra of most polymerized states. The reaction between Qn structure units, 2Qn ⇌ Qn-1 + Qn+1, seemed to proceed to the left direction with increasing aluminum oxide contents as NaAlO2 into the sodium silicate glass.

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