Abstract
LaAl 2 and LaAl 3 exhibit MgCu 2 type (space group Fd3m) and Ni 3Sn type (space group P6 3/mmc) structures, respectively, at NTP. High pressure X-ray diffraction studies on these two systems are carried out up to ∼35 and ∼30 GPa, respectively, with a diamond anvil cell, mounted on a high precision Guinier diffractometer. The volume compression determined at the highest pressures are about 33% for LaAl 2 and 23% for LaAl 3. Neither compound shows any structural transition.
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