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TEM study of synthetic hillebrandite (Ca2SiO4 · H2O)

Published online by Cambridge University Press:  03 March 2011

Youn Joong Kim ,
Waltraud M. Kriven  and
Takeshi Mitsuda
Youn Joong Kim
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Waltraud M. Kriven
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Takeshi Mitsuda
Affiliation:
Ceramic Research Laboratory, Nagoya Institute of Technology, Tajimi, Gifu 507, Japan
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Abstract

Hillebrandite (dicalcium silicate hydrate) was produced by a hydrothermal process. Its crystal structure and microstructures were investigated by conventional TEM and HREM. Most hillebrandite fibers showed their elongation to be parallel to the b axis and tended to lie on the {001} cleavage planes. Selected area diffraction patterns frequently displayed continuous streaking, and corresponding dark-field images revealed stacking disorders perpendicular to the fiber axis. The morphology, stacking disorders, and extinction conditions of {hkO} reflections and hillebrandite resembled those of the minerals wollastonite (CaSiO3) and pectolite (Ca2NaH[SiO3]3). Periodic (100) faulting with a displacement vector 1/2 b is suggested to be the major origin of the streaking and the systematic absences in hillebrandite.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 11 , November 1993 , pp. 2948 - 2953
Copyright
Copyright © Materials Research Society 1993

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References

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