Apr 11, 2012 - (1-3) They consist of bi(multi)stable crystalline materials with .... as well as four mixed-ligand MIL-53(Al)-x%NH2 samples (x = 10â70%), were .... the range 0.43â0.51 cm3/g with BET surface areas of 1000â1100 m2/g. .... as well as the corresponding reconstructed isotherms by numerical integration of eq 3.