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Role of water during AlN-hydrolysis-assisted solidification in ceramic suspensions studied by proton nuclear magnetic resonance T2 relaxation

Published online by Cambridge University Press:  31 January 2011

S. Novak ,
G. Lahajnar ,
A. Sepe  and
T. Kosmač
S. Novak
Affiliation:
“Jozef Stefan Institute”, Jamova 39, 1000 Ljubljana, Slovenia
G. Lahajnar
Affiliation:
“Jozef Stefan Institute”, Jamova 39, 1000 Ljubljana, Slovenia
A. Sepe
Affiliation:
“Jozef Stefan Institute”, Jamova 39, 1000 Ljubljana, Slovenia
T. Kosmač
Affiliation:
“Jozef Stefan Institute”, Jamova 39, 1000 Ljubljana, Slovenia
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Abstract

Using proton nuclear magnetic resonance (1H-NMR), we have studied the thermally activated hydrolysis of aluminum nitride admixed into Al2O3 aqueous suspensions. We paid special attention to the formation of aluminum hydroxide and its role in binding the host ceramic particles into a stiff solid matrix. The water–proton NMR spin-spin relaxation time (T2) was continuously measured as a function of the time of the AlN hydrolysis in the host Al2O3 ceramic suspension. T2 was found to correlate with an increasing fraction of bound water at the surface of the formed hydrogel and so provided us with information about the gel-surface growth during the hydrolysis process. These results are in good agreement with the observed time- and composition-related increases in high-frequency impedance for the analyzed suspensions.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 8 , August 2003 , pp. 1968 - 1974
Copyright
Copyright © Materials Research Society 2003

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References

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