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Sol-Gel Synthesis of Protoenstatite

Published online by Cambridge University Press:  21 February 2011

Steven A. Jones  and
James M. Burlitch
Steven A. Jones
Affiliation:
Department of Chemistry, Cornell University, Ithaca, NY 14853
James M. Burlitch
Affiliation:
Department of Chemistry, Cornell University, Ithaca, NY 14853
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Abstract

Protoenstatite, a high-temperature polymorph of enstatite (MgSiO3), is generally not stable at room temperature, and is difficult to synthesize. Using a recently developed, hydrogen peroxide-assisted, sol-gel synthesis, protoenstatite was synthesized in a form that was stable at room temperature. Its crystallization was strongly dependent on processing conditions, particularly on the manner in which the xerogel was formed and fired. Xerogels prepared by evaporation, sprav-drying and freeze-drying were compared by XRD, HTXRD, BET, TG/DTA, and 29Si NMR methods. When samples were prepared by evaporation or spray-drying, the result was a mixture of polymorphs. Only the freeze-dried precursor yielded protoenstatite at a lower temperature and within a shorter time than any previously reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 415
Copyright
Copyright © Materials Research Society 1998

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References

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