  We present ab initio density-functional study of the noncentrosymmetric
B20-type phase of RhGe, which is not found in nature and can be synthesized
only at extreme pressures and temperatures. The structural, thermodynamic,
electronic, lattice-dynamical, and transport properties of B20-RhGe are
calculated, and their evolution with increasing pressure is traced. The
temperature dependence of the charge and heat transport properties is evaluated
within the semi-classical Boltzmann approach. Using the quasi-harmonic
approximation, we determine the range of pressures and temperatures, in which
B20-RhGe is stable, and make recommendations for optimizing the synthesis
conditions in order to reduce the number of defects that occur in a sample
during solidification.
