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New Developments in Multiple Small-Angle Neutron Scattering Studies of Advanced Ceramics

Published online by Cambridge University Press:  22 February 2011

Andrew J. Allen ,
Norman F. Berk ,
Susan Krueger ,
Gabrielle G. Long ,
Helen M. Kerch  and
Jan Ilavsky
Andrew J. Allen
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899. Dept. of Materials and Nuclear Engineering, University of Maryland, College Park, MD 20742.
Norman F. Berk
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
Susan Krueger
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
Gabrielle G. Long
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
Helen M. Kerch
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899. U.S. Dept. of Energy, Office of Basic Energy Sciences, Germantown, MD 20585.
Jan Ilavsky
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899. State University of New York, Stony Brook, NY 11794.
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Abstract

An enhanced multiple small-angle neutron scattering (MSANS) formulation has been developed to interpret the beam-broadening, arising from coarse, concentrated pore/grain microstructures in porous ceramics and similar materials. Prolific scattering from such systems precludes single-scattering studies (apart from Porod surface determinations). Previous MSANS techniques, which have been developed to extract the mean pore dimensions, either treat a range of scattering morphologies, while assuming that the scattering is in the diffraction limit, or they consider refraction effects, while assuming that the scattering features are spherical. Many systems of interest violate both these assumptions. In the enhanced formulation, the previous method, which allowed fully for refraction, is extended to non-spherical scattering morphologies. Applications of the MSANS formulation to sintering studies of Si3N4 and silica gels, and to the microstructural characterization of plasma-spray coatings are currently of interest.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 347
Copyright
Copyright © Materials Research Society 1995

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References

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