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A determination of structural evolution during the processing of glycol-based, sol-gel derived ceramics through the study of ferrimagnetic interactions

Published online by Cambridge University Press:  31 January 2011

Edward J. Donahue ,
Michael Ng  and
Patrick Li
Edward J. Donahue*
Affiliation:
Long Island University, Chemistry Department, Brooklyn, New York 11201
Michael Ng
Affiliation:
Long Island University, Chemistry Department, Brooklyn, New York 11201
Patrick Li
Affiliation:
Polytechnic University, Department of Chemical & Biological Sciences, Brooklyn, New York 11201
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

This work studies the chemical and structural changes that occur in sols upon heating to form ceramics. Ferrimagnetic Y3Fe5O12 (YIG) was chosen because the geometric and structural constraint of ferrimagnetic interactions allow for a direct measurement of the degree of well-defined structure present within the sol at various stages of development. Glycolate sols of 8% mol total metal were prepared using Y(NO3)3 and Fe(NO3)3 hydrates in stoichiometric ratios. Terminal straight-chain diols were used, ranging from 1,2-ethanediol to 1,6-hexanediol. The temperatures at which mass change occurred during heating were determined by thermogravimetric analysis. Samples were heated to these temperatures and examined by Fourier transform infrared spectroscopy (FTIR), x-ray diffraction, and magnetometry to determine chemical, structural, and magnetic changes. Ferrimagnetic ordering was present after the first heating step. Defined structure, determined by x-ray, occurred in the penultimate step. Analysis of FTIR spectra, in conjunction with the results of thermogravimetric analysis, revealed a predictable decomposition pathway.

Keywords

Sol-gelFerromagneticMagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 11 , November 2007 , pp. 3152 - 3157
Copyright
Copyright © Materials Research Society 2007

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References

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