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Structural mechanisms of phase transitions Si(Ge)I→III. II: Germanium

The authors study the geometrical relation between the crystal structures of the metastable high-pressure GeIII and the diamond-type phase GeI. Starting from the proposition that the GeIII structure can be obtained by «corrugating» the lonsdaleite structure, the unit-cell parameters of GeI are determined; it contains a system of points, equivalent to GeIII, of 12 atoms: a I =2/3a 0 √3; b I =3/4a 0 √2; c I =1/2a 0 √6 (a 0 is the parameter of the unit cell of GeI), and orientation ratios for the transition GeI→III, which proved to be analogous to the ratios for the transition SiI→III: (111) dia //(100) GeIII and [110] dia //[010] GeIII