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A new layered Ti-based pnictide oxide superconductor, Ba1-xNaxTi2Sb2O (0.0 <=x <= 0.33), is reported. X-ray studies reveal it crystallizes in the tetragonalCeCr2Si2C structure. The undoped parent compound, BaTi2Sb2O (P4/mmm;a=4.1196(1){\AA}; c=8.0951(2){\AA}), exhibits a CDW/SDW transition at 54K. Uponchemical doping with Na, the CDW/SDW transition is systematically suppressedand super-conductivity arises with the critical temperatures, Tc, increasing to5.5 K. Bulk superconductivity is confirmed by resistivity, magnetic and heatcapacity measurements. Like the high-Tc cuprates and the iron pnictides,superconductivity in BaTi2Sb2O arises from an ordered state. Similarities anddifferences to the cuprate and iron pnictide supercon-ductors are discussed.

Ba1-xNaxTi2Sb2O (0.0 <= x <= 0.33): A Layered Titanium-based Pnictide Oxide Superconductor