The study of Sr-doped lanthanum manganites (La(1-x)Sr(x)MnO(3)) leads to solid oxide fuel cells (SOFC) cathodic material application. This material has been studied due to its excelent electrochemical, chemical and thermical stability performance, futher electrolyte compatibility. This composition was prepared using traditional ceramic processing methods. The density about 93% of the theoretical was obtained for x = 0,5. The results obtained suggested that sintering temperature and type materials used for preparation powder of La(1-x)Sr(x)MnO(3) could influence the sintered density and porosity of the sintered samples. Vickers microhardness measurements showed similar behaviour for the samples prepared with different purity degrees of La(2)O(3).