Fig. 1: Synchrotron X-ray powder diffraction data for BiNiO3.

a Data at variable pressures and 300 K, showing the transition from insulating Phase-I to metallic Phase-II with coexistence at 3.81–4.03 GPa. b Data on cooling at 4.3 GPa showing the transition to Phase-Id below 200 K. The inset shows the evolution of the (100) reflection of the monoclinic phase.