Masters Theses


Tihana Fuss


"The concentration of nuclei (Nv) in a Li2O·2SiO2 (LS2) glass was measured using a newly developed DTA technique, after densifying the glass at 1, 3, or 6 GPa pressure at 400° C for 20 min. Ny increased from 38 x 1012 m-3 for an as-melted glass to 82 x 1012 m-3 for a glass subjected to a pressure of 1 GPa, and then remained nearly constant with increasing pressure up to 6 GPa. This increase in Ny is equivalent to nucleating this LS2 glass for 2 h at the temperature (455° C) where its nucleation rate is a maximum The average effective activation energy for crystallization for the densified glasses, 292 ±10 kJ/mol, was also the same as that of the (undensified) glass nucleated at 455° C for 2 h, but was significantly smaller than that (358 ±10 kJ/mol) for an as-melted (undensified and unnucleated) glass. The present results show that applying an external pressure on this LS2 glass shifts its nucleation curve to lower temperatures causing nuclei to form at temperatures as low as 400° C. A decrease in viscosity at all temperatures with the application of pressure is suspected to be a reason for the enhanced nucleation observed for this LS2 glass.


Day, D. E.

Committee Member(s)

Brow, Richard K.
Switzer, Jay A., 1950-
Ray, C. S.


Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering


University of Missouri--Rolla

Publication Date

Fall 2002


x, 46 pages

Note about bibliography

Includes bibliographical references (pages 41-45.


© 2002 Tihana Fuss, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings


Thesis Number

T 8096

Print OCLC #


Link to Catalog Record

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