Barium ruthenate is an inorganic compound, with the chemical formula BaRuO3. It can be obtained from the stoichiometric reaction of barium oxide and ruthenium(IV) oxide at temperatures below 1200 °C,Popova, T. L.; Kisel, N. G.; Krivobok, V. I.; Karlov, V. P. Reactions in the barium oxide-ruthenium(IV) oxide system. Ukrainskii Khimicheskii Zhurnal (Russian Edition), 1982. 48 (5): 457-460. . or from the thermal decomposition of Ba[Ru(NO)(NO2)4(OH)]·xH2O.Sinitsyn, N. M.; Kokunova, V. N. Preparation of double ruthenium oxides from coordination compounds. Zhurnal Neorganicheskoi Khimii, 1990. 35 (12): 3120-3123. . It reacts with ruthenium and ruthenium(IV) oxide at 1250 °C to obtain black needle-like crystal BaRu6O12. Hydrogen or zirconium can reduce it when heated to produce metal ruthenium.
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