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olume 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 by the pressure. Xray diffraction measurement Electrical property Electrical density of states at 0, 50 and 100 GPa were calculated. Insulator to metal transition? (P 100 GPa) Purpose of this experiment the insulator to metal transition in AlH3 To observe the crystal structure under high pressure ? Xray diffraction measurement ? electrical resistance measurement were performed under high pressure. Experimental method ? Xray diffraction measurement ( at European Synchrotron Radiation Facilit