Chapter 40. Sol-Gel Route to Celsian Ceramic

  1. John B. Wachtman Jr.
  1. Jagadish C. Debsikdar

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314050.ch40

A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2

A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2

How to Cite

Debsikdar, J. C. (1993) Sol-Gel Route to Celsian Ceramic, in A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314050.ch40

Author Information

  1. U.S. Bureau of Mines Tuscaloosa Research Center Tuscaloosa, AL 35486

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375235

Online ISBN: 9780470314050

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Keywords:

  • aluminum sec butoxide;
  • tetraethoxyorthosilicate;
  • scanning electron microscopy;
  • brunauer emmett teller method;
  • barium aluminosilicate

Summary

Celsian composition (BaAl2Si2O8) was synthesized by hydrotyzing a suitable solution of mixed alkoxides comprising barium isopropoxide, aluminum sec-butoxide, and tetraethoxyorthosilicate. Thermophysical changes associated with the evolution of crystallinity in the gel were monitored by studing the changes of specific surface area (Brunauer Emmett Teller (BET) Method), microstructural features (scanning electron microscopy (SEM)), and crystallinity (X-ray powder diffraction (XRD)). The results showed that the gel crystallizes into the hexagonal (hexacelsian) phase via a fully dense “glasslike” state. The crystallization behavior of the gel was also studied in the presence of Li02, Ti02, Mo03, and Zr02 as the mineralizers. The effectiveness of mineralizers, in terms of lower temperature of crystallization to the monoclinic celsian phase, was of the order Li2O (∼1020°C) > TiO2 (∼1350°C) > Mo03 (>1550°C). ZrO2 was ineffective up to 7550°C in producing the celsian phase. The results of this study suggest that the sol-gel approach utilizing a Ti02-doped gel material offers an attractive, potentially cost-effective route for producing high-quality celsian ceramics compared to the conventional solid-state reaction approach.