  In this study, we report a tetragonal perovskite structure of SrIrO$_3$
(P4/mmm, a = 3.9362(9) \r{A}, c = 7.880(3) \r{A}) synthesized at 6 GPa and 1400
$\deg$C, employing the ambient pressure monoclinic SrIrO$_3$ with distorted 6H
structure as a precursor. The crystal structure of tetragonal SrIrO3 was
evaluated on the basis of single crystal and powder X-ray diffraction. A cubic
indexing was observed attributed to overlooked superlattice reflections. Weak
fractional peaks in the H and K dimensions suggest possible structure
modulation by oxygen defects. Magnetization study reveals weak paramagnetic
behavior down to 2 K, indicative of the interplay between spin-orbit coupling,
electron correlations, and crystal electric field. Additionally, measurements
of electrical resistivity display metallic behavior with an upturn at about 54
K, ascribed to weak electron localization and possible structural defects.
