CHARACTERIZATION OF ZIRCONIUM, LANTHANUM AND LEAD-OXIDE DEPOSITS PREPARED BY CATHODIC ELECTROSYNTHESIS

Cathodic electrosynthesis of zirconium, lanthanum and lead oxides was performed from aqueous solutions of ZrOCl2 . 8H(2)O, La(NO3)(3) . 6H(2 )O and Pb(NO3)(2), respectively. The deposits were characterized by X- ray diffraction, thermogravimetric and differential thermal analyses. Crystallite sizes of zirconia were derived at different temperatures f rom X-ray broadening data. The influence of hydrogen peroxide on the e lectrosynthesis process, crystallization and phase evolution of deposi ts has been studied. A possible mechanism of electrosynthesis and the role of hydrogen peroxide are discussed. (C) 1998 Chapman & Hall.