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An Exafs Study of Compositional Homogeneity in Sol-gel Processed Potassium Tantalum Niobates

Published online by Cambridge University Press:  10 February 2011

A. P. Wilkinson ,
J. XU  and
S. Pattanaik
A. P. Wilkinson
Affiliation:
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400
J. XU
Affiliation:
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400
S. Pattanaik
Affiliation:
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400
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Abstract

A series of K(Ta1-x Nbx)O3 solid-solution samples were prepared by direct reaction of oxides and carbonates, a homogeneous sol-gel process, and an inhomogeneous sol-gel process. The inhomogeneous sol-gel samples were prepared by the prehydrolysis of separate KTaO3 and KNbO3 precursor solutions followed by mixing of the resulting sols, drying and calcination. An examination of these samples by EXAFS at the Ta LIII and Nb K-edges, i) illustrated the difficulty of obtaining homogeneous solid solutions via direct reaction of oxides/carbonates, and ii) showed that the homogeneity of a solid-solution could be controlled by varying the hydrolysis procedure used during its sol-gel synthesis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 524: Symposium V – Application of Synchrotron Radiation Techniques…IV , 1998 , 333
Copyright
Copyright © Materials Research Society 1998

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References

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