STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF TI-RU-FE-O ALLOYS PREPARED BY HIGH-ENERGY BALL-MILLING

The structural and electrochemical properties of the Ti-Ru-Fe-O system have been studied over the whole ternary metal compositional range, k eeping constant the oxygen content at 30 at. %. The phase diagram was explored systematically by varying the composition of the material alo ng one of the following axes: (i) constant Ru content of 16 at. %; (ii ) constant Ti/Ru ratio of 2; (iii) constant Ti/Fe ratio of 1.6, For O/ Ti ratios equal or below unity, the most prominent peaks observed in t he x-ray diffraction patterns belong to a B2 structure. For O/Ti ratio larger than unity, stable titanium oxide phases are formed, which coe xist with a cubic Fe-like or hcp-Ru like phases depending on the Fe/Ru ratio. Powder compositions with stoichiometry close to Ti2RuFeO2 are of interest due to good electrocatalytic properties, long-term stabili ty, and low Ru content.