Fig. 7: Phase diagram of hafnia.

Under the action of \({{\rm{V}}}_{{\rm{O}}}\) (a concentration, b charge state (x = 1.56%)), uniaxial strain, and \({{\bf{E}}}_{{\bf{e}}}\). The reference for the strain is the perfect O-phase.
Under the action of \({{\rm{V}}}_{{\rm{O}}}\) (a concentration, b charge state (x = 1.56%)), uniaxial strain, and \({{\bf{E}}}_{{\bf{e}}}\). The reference for the strain is the perfect O-phase.