However, in 2020, two research groups individually prepared ice Ic without stacking disorder; Komatsu et al. prepared C2 hydrate at high pressure and decompressed it at 100 K to make hydrogen molecules extracted from the structure, resulting in ice Ic without stacking disorder; del Rosso et al.
In 2020, two research groups independently produced ice Ic without stacking disorder. Komatsu et al. created C2 hydrate under high pressure and then cooled it to 100 K to extract hydrogen molecules from the structure, leading to ice Ic without stacking disorder; del Rosso et al.