-    CRISTOBALITE     -    SiO2

The crystal structure is fully relaxed (both unit cell parameters and atomic positions under symmetry constraints) at 40GPa 

Crystal Structure 


Because of the translational symmetry all the calculations are performed in the primitive unit cell and not in the conventional unit cell. The following information regarding the structure is given with respect to this primitive unit cell, which sometimes can take an unintuitive shape.

Symmetry (experimental): 

Space group:  Theo Pc 
Lattice parameters (Å):  6.7500  4.0633  6.8344 
Angles (°):  90  90  90 

Symmetry (theoretical): 

Space group:  Theo Pc 
Lattice parameters (Å):  6.4326  3.8884  6.6717 
Angles (°):  90.00  98.05  90.00 

Cell contents: 

Number of atoms:  24 
Number of atom types: 
Chemical composition: 

Atomic positions (theoretical):

Si:  0.4917  0.0021  0.5018 
Si:  0.9917  0.4979  0.0018 
Si:  0.3600  0.9956  0.1183 
Si:  0.1370  0.5021  0.3758 
Si:  0.6370  0.9979  0.8758 
Si:  0.8600  0.5044  0.6183 
Si:  0.2687  0.4956  0.7593 
Si:  0.7687  0.0044  0.2593 
O:  0.3298  0.2314  0.3318 
O:  0.1657  0.7326  0.1674 
O:  0.6657  0.7674  0.6674 
O:  0.8298  0.2686  0.8318 
O:  0.4630  0.2326  0.7102 
O:  0.0432  0.7189  0.7958 
O:  0.5432  0.7811  0.2958 
O:  0.9630  0.2674  0.2102 
O:  0.2989  0.7314  0.5458 
O:  0.2061  0.2511  0.9576 
O:  0.7061  0.2489  0.4576 
O:  0.7989  0.7686  0.0458 
O:  0.4226  0.7511  0.9200 
O:  0.0856  0.2811  0.5818 
O:  0.5856  0.2189  0.0818 
O:  0.9226  0.7489  0.4200 
Atom type 

We have listed here the reduced coordinates of all the atoms in the primitive unit cell.
It is enough to know only the position of the atoms from the assymetrical unit cell and then use the symmetry to build the whole crystal structure.

Visualization of the crystal structure: 

Size:

  
Nx:  Ny:  Nz:    
You can define the size of the supercell to be displayed in the jmol panel as integer translations along the three crys­tallo­gra­phic axis.
Please note that the structure is represented using the pri­mi­tive cell, and not the conventional one.