-    ALACRANITE     -    As8S9

 

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:  13  P2/c 
Lattice parameters (Å):  5.2611  5.0806  4.8568 
Angles (°):  90.0  101.9  90.0 

Symmetry (theoretical): 

Space group:  13  P2/c 
Lattice parameters (Å):  10.6501  8.2818  9.7402 
Angles (°):  90.0  93.9  90.0 

Cell contents: 

Number of atoms:  34 
Number of atom types: 
Chemical composition: 

Atomic positions (theoretical):

As:  0.0479  0.2673  0.9301 
As:  0.1610  0.4853  0.7963 
As:  0.4226  0.3429  0.4253 
As:  0.3930  0.9992  0.1846 
S:  0.0000  0.1012  0.7500 
S:  0.0000  0.6571  0.7500 
S:  0.1438  0.3839  0.5781 
S:  0.2931  0.1462  0.3371 
S:  0.5000  0.4887  0.2500 
S:  0.4132  0.1780  0.0112 
As:  0.9521  0.2673  0.5699 
As:  0.8390  0.4853  0.7037 
As:  0.5774  0.3429  0.0747 
As:  0.6070  0.9992  0.3154 
S:  0.8562  0.3839  0.9219 
S:  0.7069  0.1462  0.1629 
S:  0.5868  0.1780  0.4888 
As:  0.9521  0.7327  0.0699 
As:  0.8390  0.5147  0.2037 
As:  0.5774  0.6571  0.5747 
As:  0.6070  0.0008  0.8154 
S:  0.0000  0.8988  0.2500 
S:  0.0000  0.3429  0.2500 
S:  0.8562  0.6161  0.4219 
S:  0.7069  0.8538  0.6629 
S:  0.5000  0.5113  0.7500 
S:  0.5868  0.8220  0.9888 
As:  0.0479  0.7327  0.4301 
As:  0.1610  0.5147  0.2963 
As:  0.4226  0.6571  0.9253 
As:  0.3930  0.0008  0.6846 
S:  0.1438  0.6161  0.0781 
S:  0.2931  0.8538  0.8371 
S:  0.4132  0.8220  0.5112 
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.