Abstract
There are many advantages to using a microwave as a source of heat in
hydrothermal reactions. Because it is a quick and homogeneous way to
crystallize ceramic powders, it was used in this work for the production
of antiferroelectric sodium mobate (NaNbO3) in a cubic-like form and its
intermediary phase, disodium diniobate hydrate (Na2Nb2O6 center dot
H2O), with a fiber morphology. The syntheses were carried out by
treating niobic acid (Nb2O5 center dot nH(2)O) with NaOH. By changing
the reaction time and the concentration of the reactants, particles with
different structures and different morphologies could be obtained. The
structural evolution of the products of this reaction was elucidated on
the basis of the arrangement of the NbO6 octahedral units. Conclusive
results were obtained with morphological and structural
characterizations through XRD, TEM, MEV, and NMR and Raman spectroscopy.
((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).
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