The
role of alkali content in the devitrification mechanisms of SiO2–Fe2O3–Na2O–PbO SYSTEM |
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Authors: | P Kavouras Th Kehagias K Chrissafis Ph Komninou Th Karakostas |
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Institution: | (1) Physics Department, Aristotle University of Thessaloniki, Thessaloniki, Greece, 541 24 |
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Abstract: | Three batch compositions of pure oxides (SiO2,
Fe2O3, PbO, Na2O)
with equivalent SiO2, Fe2O3
and PbO contents and a gradually increased Na2O content
were vitrified through heating in a high temperature electric furnace and
subsequent quenching. The resulting vitreous products were thermally treated
in order to study the devitrification behaviour, under conditions designated
from differential thermal analysis experiments. Depending on the Na2O
content, crystal phase separation gave rise to the growth of acmite and hematite
or maghemite. A uniformly phase separated glass-ceramic material, with crystallites
of similar size and population density, was produced from devitrification
of the vitreous product with the higher Na2O content. |
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Keywords: | electron microscopy glass-ceramics microhardness microstructure vitrification |
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