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Here we present a systematic study of the effects of pressure on thesuperconducting and spin/charge density wave (SDW/CDW) transitions ofBa$_{1-x}$Na$_x$Ti$_2$Sb$_2$O (x = 0, 0.10, and 0.15) by means of resistivitymeasurements. For x = 0 and 0.10, external pressure results in a decease of theSDW/CDW transition temperature T$_c$; however, no measurable change is observedfor the x = 0.15. The pressure effect on the superconducting transitiontemperature is different for all three samples. For BaTi$_2$Sb$_2$O (x=0),T$_c$ increases significantly from 1.2 K at zero pressure to $\sim$ 2.9 K at16.1 kbars. The 10 % Na-doped sample shows an initial T$_c$ increase up to 4.2K with pressure which saturates at higher pressure values. For higher Naconcentrations (x=0.15), T$_c$ continuously decreases with increasing pressure.

High pressure study of the normal and superconducting states of the layered pnictide oxide Ba$_{1-x}$Na$_x$Ti$_2$Sb$_2$O with x = 0, 0.10, and 0.15