T. Palasyuk, M. Tkacz
Apr 1, 2004
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Journal
Solid State Communications
Abstract
Abstract High-pressure X-ray diffraction studies of erbium trihydride have been carried out in a diamond anvil cell up to 30 GPa at room temperature. Structural phase transformation from hexagonal to cubic phase has been detected at a pressure of about 15 GPa. The molar volume of ErH 3 as a function of pressure has been fitted with Murnaghan's equation of state. Bulk modulus B o and its pressure derivative B o ′ have been determined for both phases. The lattice parameter of the new, cubic phase was determined as equal to 5.23 A at normal pressure. The volume change accompanied by the phase transition has been calculated.