Comparative study of the synthesis of KReO₄ using acrylamide sol-gel and solid-state reaction methods

KReO₄ was synthesized by solid-state reaction and for the first time by sol-gel method via acrylamide polymerization. X-ray diffraction analysis showed that a single phase of KReO₄ was obtained by both methods at 500-505 °C having a tetragonal unit cell. The solid-state reaction samples had a grain size of 5 μm and the sol-gel samples had fibrous aspect, agglomerated between 10 and 100 μm. By TEM it was observed nanocrystals of 100 nm, it is suggested that the xerogel fibers are formed by nanocrystals. From the results obtained, we concluded that the morphology is strongly influenced by the method of synthesis used.