34. Analysis of Scattering Sites in Transparent Magnesium Aluminate Spinel

  1. Jeffrey J. Swab
  1. Guillermo Villalobos1,
  2. Jasbinder S. Sanghera1,
  3. Ishwar D. Aggarwal1 and
  4. Robert Miklos2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291276.ch34

Advances in Ceramic Armor: A Collection of Papers Presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida, Ceramic Engineering and Science Proceedings, Volume 26, Number 7

Advances in Ceramic Armor: A Collection of Papers Presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida, Ceramic Engineering and Science Proceedings, Volume 26, Number 7

How to Cite

Villalobos, G., Sanghera, J. S., Aggarwal, I. D. and Miklos, R. (2005) Analysis of Scattering Sites in Transparent Magnesium Aluminate Spinel, in Advances in Ceramic Armor: A Collection of Papers Presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida, Ceramic Engineering and Science Proceedings, Volume 26, Number 7 (ed J. J. Swab), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291276.ch34

Author Information

  1. 1

    U.S. Naval Research Laboratory 4555 Overlook Ave Washington, DC 20375

  2. 2

    SFA Inc. 9315 Largo Dr. West Largo, MD 20774

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982374

Online ISBN: 9780470291276

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Keywords:

  • scattering;
  • magnesium aluminate;
  • optical properties;
  • polycrystalline materials;
  • sintering

Summary

Scattering sites greatly degrade the transmission of magnesium aluminate spinel. It appears that some of the scattering sites are caused by reactions with the LiF traditionally used as a sintering aid. LiF is used to etch spinet particles during the hot pressing process. The LiF was found to react with the aluminum in the spinel structure thereby leaving magnesium rich regions behind that do not sinter well and result in opaque regions in the otherwise transparent matrix. Avoiding the conditions where the reaction is most aggressive allows the densification of spinel that transmits throughout the entire transmission range at 100% of the theoretical bulk value.