Formation of the La(1-x)Ba(x)Cr(1-y)Ti(y)O(similar to 3)is investigated in the range of 0.0 < x < 0.2 and 0.0 < y < 0.5, with x less than or equal to y. Redox behavior and electrical conductivity are studied as functions of partial pressure of oxygen. In pure oxygen atmosphere at 1000 degrees C, the miscibility limits are x(m) = 0.05(2) (when x < y) and y(m) < 0.19(1) (when x = 0) accompanied by demixing of BaCrO4 and La2Ti2O7, respectively. The y(m) value is increased to at least 0.5 under p(o2) = 10(-23) atm, where a large portion of Ti-IV is reduced to Ti-III. Electrical conductivity is governed by the redox behavior of Cr and Ti, with a minimum close to the stoichiometric point with Cr-III and Ti-IV present. A relatively high n-conductivity appears when Ti (donor) is in excess of Ba (acceptor), but the effect of Ba is still seen in the oxidized region where Ba promotes oxidation of Cr-III. Thermodynamic data are evaluated for the reduced region, and are in qualitative agreement with the chemically analyzed oxidation state of Ti.