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We have performed an isovalent substitution study in a layered titaniumoxypnictide system BaTi$_{2}$(Sb$_{1-x}$Bi$_{x}$)$_{2}$O (0$\leq x\leq$ 0.40)by the measurements of x-ray diffraction, electrical resistivity and magneticsusceptibility. The parent compound BaTi$_{2}$Sb$_{2}$O is confirmed to exhibitsuperconductivity at 1.5 K as well as charge- or spin-density wave (CDW/SDW)ordering below 55 K. With the partial substitution of Sb by Bi, the latticeparameters $a$, $c$ and $c/a$ all increase monotonically, indicating negativechemical pressure and lattice distortion on the (super)conductingTi$_2$Sb$_2$O-layers. The Bi doping elevates the superconducting transitiontemperature to its maximum $T_c$=3.7 K at $x=$0.17, and then $T_c$ decreasesgradually with additional Bi doping. A metal-to-nonmetal transition takes placearound $x$=0.3, and superconductivity at $\sim$1K exists at the nonmetal side.The CDW/SDW anomaly, in comparison, is rapidly suppressed by the Bi doping, andvanishes for $x\geq$0.17. The results are discussed in terms of negativechemical pressure and disorder effect.

Superconductivity, charge- or spin-density wave, and metal-nonmetal transition in BaTi$_{2}$(Sb$_{1-x}$Bi$_{x}$)$_{2}$O