Figure 2
From: Easily doped p-type, low hole effective mass, transparent oxides

La2SeO2 stability triangle in the chemical potentials plane.
The white area defines the range of chemical potentials in which La2SeO2 is stable against precipitation of competing binary phases La2O3 and LaSe. The chemical potentials are given with respect to their standard phases, i.e., , where
corresponds to the solid metal for selenium and to the diatomic molecule for oxygen.