Structural phase transition of GdGa<sub>2</sub> at high pressure

Zeitschrift fur Kristallographie - Crystalline Materials - Tập 216 Số 6 - Trang 331-336 - 2001
Ulrich Schwarz1, S. Bräuninger, Ulrich Burkhardt2, K. Syassen3, Michael Hanfland3
1Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society
2Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society
3Max Planck Institute for Chemical Physics of Solids, Max Planck Society

Tóm tắt

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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Tài liệu tham khảo

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Zeitschrift fur Kristallographie - Crystalline Materials

Tập 216 Số 6

331-336

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