  In the present paper, the electronic, structural, thermodynamic, and elastic
properties of cubic $PbGeO_{3}$ perovskite oxide are presented and computed
using the WIEN2K code. The structural properties have been evaluated and they
are in good agreement with the theoretical and experimental data. A phonon
dispersion is made and it reveals that the cubic $PbGeO_{3}$ perovskite is
dynamically stable. In addition, the electronic properties of $PbGeO_{3}$ shows
an opening gap energy, meaning a semiconductor behavior with an indirect band
gap equal to $1.67 eV$. Moreover, the obtained elastic constants of cubic
$PbGeO_{3}$ satisfy Born's mechanical stability criteria, and this indicates
that our compound behaves as a stable ductile material. The
temperature-pressure effects on thermodynamic parameters are investigated using
the Gibbs$2$ package. Finally, based on the obtained results about the cubic
$PbGeO_{3}$ perovskite properties, we assume that this compound will have
potential applications.
