INVESTIGATION OF THE O-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) CUBIC PEROVSKITES OBTAINED BY ELECTROCHEMICAL OXIDATION

The transition-metal perovskites SrFe(1.)xCo(x)O(3) (0 less than or eq ual to x less than or equal to 1) are of a great interest because the high oxidation states of the transition-metal (Fe(IV), Co(IV)) can be stabilized. Moreover these compounds exhibit interesting magnetic prop erties. These oxygen stoichiometric phases have been prepared only und er high oxygen pressures. A novel preparation method of these phases h as been investigated using electrochemical oxidation of the SrFe(1.x)C o(x)O(25)brownmillerite-type compounds [1-3]. The starting materials a nd the phases obtained after electrochemical processing have been char acterized by X-ray powder diffraction, chemical analysis and Fe-57 Mos sbauer spectroscopy. Finally, tile magnetic and transport properties h ave been studied.