Fig. 4: Adsorption isotherms of N2 at 77 K and H2 at 20 K, respectively.
From: Small-pore hydridic frameworks store densely packed hydrogen

a, The first batch sample with short-term storage, exhibiting 42% amorphization. Data correction for the amount of the amorphous phase results in γ-Mg(BH4)2∙2.04H2. b, The second batch sample with long-term storage, exhibiting 62% amorphization. Data correction for the amount of the amorphous phase results in γ-Mg(BH4)2∙2.06H2.