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Summary: J. Am. Ceram. SOC., 72 [8] 1571 (1989)
journal
Reply
llhan A. Aksay,* Mehmet Sarikaya,* and Birol Sonuparlak*,*
Department of MaterialsScience and Engineering, University of Washington, and
Advanced MaterialsTechnology Program, Washington Technology Center, Seattle, Washington 98195
I N OUR recent publication' we illustrated
(1) that the 980°C exotherm in the
kaolinite-to-mullite series is caused by the
formation of a y-Alz03spinel phase alone
and (2) that this spinel phase contains not
more than 10 wt% silica in solid solution.
Chakraborty and Ghosh2 agree with us on
the first issue but question the appropriate-
ness of the experimental procedure we
followed in assigning the 980°C exotherm
to the formation of the spinel phase. On
the second issue, they dispute our findings
in favor of their earlier results3 on the
grounds that our composition analysis was
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