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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) September 25, 2009

Structural phase transition of GdGa2 at high pressure

U. Schwarz, S. Bräuninger, U. Burkhardt, K. Syassen and M. Hanfland

Abstract

Structural properties of the intermetallic compound GdGa2 were investigated under hydrostatic pressures up to 20 GPa using angle dispersive x-ray powder diffraction in combination with the diamond anvil cell technique. At 7.7(5) GPa the onset of a first order phase transition from the AlB2 type structure into a hexagonal high-pressure phase is observed. The transformation is associated with a 2.5 % elongation of the lattice parameter a and an 8 % shortening of c. TB-LMTO bandstructure calculations reveal that the two-dimensional character of the gallium partial structure is preserved in the high-pressure modification.

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Published Online: 2009-9-25
Published in Print: 2001-6-1

© 2001 Oldenbourg Wissenschaftsverlag GmbH

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