Fig. 1: Structure changes before and after flux reconstruction.

a Illustration of the flux reconstruction process from AMBN to BN-700 (Hydrogen, carbon, boron, and nitrogen atoms are represented by white, black, pink, and blue spheres, respectively); b TEM image of AMBN; c TEM image of BN-700; d XRD patterns of AMBN and BN-700; e Raman spectra of AMBN and BN-700; f Measured atomic pair distribution functions, G(r), of AMBN and BN-700 and a magnified region of G(r) covering short bond distances in the B3N3 ring. Source data are provided as a Source Data file.