Figure 3: XRD patterns of VO2(B) nanosheets upon compression and heating.

(a) XRD pattern of the pristine VO2(B) nanosheets; (b) XRD pattern of PIA-VO2(B) recovered from 31.5 GPa; (c) XRD pattern of PIA-VO2(B) after annealing at 250 °C in a vacuum for 5 min. Bottom: theoretical Bragg lines of VO2(B) and VO2(M). The peaks of (c) are indexed with the monoclinic space group C2/m and lattice constants: a=12.065(3) Å, b=3.650(9) Å, c=6.482(11) Å and β=107.53(7)°.