Thermally induced rings formation in aluminosilicate structures

S. Marković, Vera Dondur, R. Dimitrijević, S. Macura

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

In the present study, we performed an investigation of phase transformation of zeolite Na-GIS in temperature interval from room temperature up to 1300°C. The collapse of S4R and S8R (secondary building units in zeolite Na-GIS) and the forming of pure sodium nepheline phase, consists of S6R, was examined. During the thermal transformation of Na-GIS zeolite symmetry of rings was changed and their deformation increases. The irregularity of rings causes the appearance of defect modes in the IR spectra of amorphous precursors. Investigated phases were characterized by XRPD, IR, NMR and DSC methods. A semiempirical method AM1 was used for calculation of vibrational spectrum of nepheline.

Original languageEnglish (US)
Pages (from-to)253-258
Number of pages6
JournalJournal of Thermal Analysis and Calorimetry
Volume84
Issue number1
DOIs
StatePublished - Apr 2006

Keywords

  • Pure sodium nepheline
  • Structural transitions
  • Zeolite NaP

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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