【正文】
YH3, AlH3… Hydrogen molecular is contained mol per mol of M. Hydrogen in MHx is prepressed at ambient pressure. The partial hydrogen volume in MHx That volume in H2. At much lower pressure, hydrogen dense metallic state could be observed. 引き去ること Hydrogen atomic volume in MHx from subtraction of atomic volume of M. AlH3 R3c structure Two AlH6units share this H atom. AlH6 octahedrons linked by AlHAl bridges The partial hydrogen volume per H atom in AlH3 ( A3) is smaller than that in H2 ( A3). Hydrogen in AlH3 is prepressed ! P ~ ambient pressure H AlH distance: A HH distance: A Volume per formula unit in AlH3: 33 A3 Previous studies on AlH3 P 35 GPa, there is no structural transition. Insulator is stable at about 100 GPa. Band gap decreases