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

Hideki Maekawa, Takashi Maekawa, Katsuyuki Kawamura, Toshio Yokokawa

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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
Issue number18
Publication statusPublished - Jan 1 1991

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry


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