Based on the comparison of the distortion (Figure , ESI: Figure , Table -S9) and on fitting of the spectra of the Ni time series (ESI: Figure and S16, Table -S18, Supplementary Note 2), the structure of the amorphous Ni phases formed at 90°C showed similarities to that of Ni-dittmarite, albeit with a less pronounced long-range order. After a 40-min-long heating time, the transformation was completed, majorly visible in the pre-peak area integration results and calculated bond distances (ESI: Figure , Table -S18).