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High‐Pressure Structures of Ge above 100 GPa
Author(s) -
Takemura K.,
Schwarz U.,
Syassen K.,
Christensen N.E.,
Hanfland M.,
Novikov D.L.,
Loa I.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200101)223:2<385::aid-pssb385>3.0.co;2-e
Subject(s) - orthorhombic crystal system , crystallography , synchrotron , diffraction , crystal structure , phase transition , materials science , germanium , tin , phase (matter) , x ray crystallography , germanium compounds , condensed matter physics , chemistry , silicon , optics , physics , metallurgy , organic chemistry
We have investigated structural phase transitions of Ge at pressures up to 190 GPa using monochromatic synchrotron X‐ray diffraction. The phase appearing near 100 GPa is found to have an orthorhombic structure (space group Cmca , Z = 16 atoms per unit cell, isotypic to Si–VI). Ge further undergoes a sluggish transition to a hcp structure at around 160–180 GPa. With these new findings, the sequence of structural transitions observed for Ge under pressure up to 190 GPa is similar to that of Si in the range up to 50 GPa. We have performed full potential linear muffin tin orbital calculations of the volume‐dependent total energies of Ge in different crystal structures. The calculated phase transitions are compared to the experimental results reported here.