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Synthesis of sillenite-type compounds from zeolite precursors: XRPD and SEM/EDS analyses

A. RADOSAVLJEVIC-MIHAJLOVIC1,* , P. VULIC2, B. MATOVIC1, A. DEVECERSKI1

Affiliation

  1. Institute of Nuclear sciences Vinca, P.O. Box 522, 11001 Belgrade, Serbia
  2. Institute for Mineralogy and Petrography, University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria

Abstract

The paper analyze the possibility of using LTA zeolite as a precursor for obtaining sillenite phase (Bi12MO20, M=Si, Ti, Ge) by hydrothermal synthesis process. The synthesis procedure involves mixing of zeolite (Na-LTA) water solution with native bismuth in autoclave at 170oC for 7 days. As-prepared sample contains sillenite Bi12SiO20 and nepheline (Na2AlO6) phases. The structures of sillenite and nepheline phases were determined by XRPD methods, and their quantitative amounts were calculated by Rietveld method. These structures were refined with agreement factors: Rp= 7.21, Rwp= 9.25 and Rbragg = 6.14 for a cubic structure sillenite and Rbragg = 18.6 for nepheline phases. The weight fractions were 36.73% for sillenite and 63.72% for nepheline. The shape, morphology and chemical composition of investigated phase are done by means of scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS)..

Keywords

Sillenite, Zeolite precursor, XRPD, SEM, EDS.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

A. RADOSAVLJEVIC-MIHAJLOVIC, P. VULIC, B. MATOVIC, A. DEVECERSKI, Synthesis of sillenite-type compounds from zeolite precursors: XRPD and SEM/EDS analyses, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 887-890 (2008)