-    HYDROHALITE     -    NaCl2H2O

 

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:  14  P2_1/c 
Lattice parameters (Å):       
Angles (°):       

Symmetry (theoretical): 

Space group:  14  P2_1/c 
Lattice parameters (Å):  6.4717  10.1234  6.5512 
Angles (°):  90.0  117.9  90.0 

Cell contents: 

Number of atoms:  32 
Number of atom types: 
Chemical composition: 

Atomic positions (theoretical):

Na:  0.0127  0.1666  0.4458 
Cl:  0.2943  0.1108  0.2115 
O:  0.7941  0.3248  0.1575 
O:  0.2333  0.4870  0.2329 
H:  0.7900  0.4137  0.2181 
H:  0.6334  0.3140  0.0330 
H:  0.3871  0.5172  0.2542 
H:  0.2570  0.4563  0.3855 
Na:  0.9873  0.6666  0.0542 
Cl:  0.7057  0.6108  0.2885 
O:  0.2059  0.8248  0.3425 
O:  0.7667  0.9870  0.2671 
H:  0.2100  0.9137  0.2819 
H:  0.3666  0.8140  0.4670 
H:  0.6129  0.0172  0.2458 
H:  0.7430  0.9563  0.1145 
Na:  0.9873  0.8334  0.5542 
Cl:  0.7057  0.8892  0.7885 
O:  0.2059  0.6752  0.8425 
O:  0.7667  0.5130  0.7671 
H:  0.2100  0.5863  0.7819 
H:  0.3666  0.6860  0.9670 
H:  0.6129  0.4828  0.7458 
H:  0.7430  0.5437  0.6145 
Na:  0.0127  0.3334  0.9458 
Cl:  0.2943  0.3892  0.7115 
O:  0.7941  0.1752  0.6575 
O:  0.2333  0.0130  0.7329 
H:  0.7900  0.0863  0.7181 
H:  0.6334  0.1860  0.5330 
H:  0.3871  0.9828  0.7542 
H:  0.2570  0.0437  0.8855 
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.
 

Dielectric Properties 


We define:

  • The Born effective charges, also called dynamical charges, are tensors that correspond to the energy derivative with respect to atomic displacements and electric fields or, equivalently, to the change in atomic force due to an electric field: The sum of the Born effective charges of all nuclei in one cell must vanish, element by element, along each of the three directions of the space.
  • The dielectric tensors are the energy derivative with respect to two electric fields. They also relate the induced polarization to the external electric field.

Born effective charges (Z): 

Na: 1.1276 0.0217 0.0007 
0.0362 1.0850 0.0326 
0.0001 0.0389 1.0410 
Eig. Value: 1.1453 1.0892 1.0191 
Cl: -1.0898 0.0569 0.0321 
0.0635 -1.0551 -0.0442 
0.0505 -0.0460 -1.1351 
Eig. Value: -1.1955 -1.0085 -1.0759 
O: -0.8856 0.0885 -0.0845 
0.0764 -1.1607 -0.0823 
-0.1376 -0.1348 -1.0848 
Eig. Value: -0.7955 -1.2378 -1.0978 
O: -1.2234 -0.2192 0.2503 
-0.2035 -0.9183 0.1132 
0.2615 0.1404 -1.0994 
Eig. Value: -1.5237 -0.8101 -0.9073 
H: 0.3572 -0.2306 -0.0499 
-0.1527 0.8865 0.2232 
-0.0368 0.2356 0.4123 
Eig. Value: 0.2789 1.0349 0.3423 
H: 0.4301 0.0248 0.1877 
-0.0207 0.3740 -0.1211 
0.2306 -0.0739 0.6935 
Eig. Value: 0.2835 0.3892 0.8249 
H: 0.8895 0.2955 -0.0408 
0.2889 0.4141 0.0162 
-0.0625 0.0110 0.2709 
Eig. Value: 1.0306 0.3065 0.2374 
H: 0.3944 0.0907 -0.2957 
0.0729 0.3744 -0.2105 
-0.3058 -0.2449 0.9015 
Eig. Value: 0.2460 0.3050 1.1193 
Na: 1.1276 -0.0217 0.0007 
-0.0362 1.0850 -0.0326 
0.0001 -0.0389 1.0410 
Eig. Value: 1.1453 1.0892 1.0191 
Cl: -1.0898 -0.0569 0.0321 
-0.0635 -1.0551 0.0442 
0.0505 0.0460 -1.1351 
Eig. Value: -1.1955 -1.0085 -1.0759 
O: -0.8856 -0.0885 -0.0845 
-0.0764 -1.1607 0.0823 
-0.1376 0.1348 -1.0848 
Eig. Value: -0.7955 -1.2378 -1.0978 
O: -1.2234 0.2192 0.2503 
0.2035 -0.9183 -0.1132 
0.2615 -0.1404 -1.0994 
Eig. Value: -1.5237 -0.8101 -0.9073 
H: 0.3572 0.2306 -0.0499 
0.1527 0.8865 -0.2232 
-0.0368 -0.2356 0.4123 
Eig. Value: 0.2789 1.0349 0.3423 
H: 0.4301 -0.0248 0.1877 
0.0207 0.3740 0.1211 
0.2306 0.0739 0.6935 
Eig. Value: 0.2835 0.3892 0.8249 
H: 0.8895 -0.2955 -0.0408 
-0.2889 0.4141 -0.0162 
-0.0625 -0.0110 0.2709 
Eig. Value: 1.0306 0.3065 0.2374 
H: 0.3944 -0.0907 -0.2957 
-0.0729 0.3744 0.2105 
-0.3058 0.2449 0.9015 
Eig. Value: 0.2460 0.3050 1.1193 
Na: 1.1276 0.0217 0.0007 
0.0362 1.0850 0.0326 
0.0001 0.0389 1.0410 
Eig. Value: 1.1453 1.0892 1.0191 
Cl: -1.0898 0.0569 0.0321 
0.0635 -1.0551 -0.0442 
0.0505 -0.0460 -1.1351 
Eig. Value: -1.1955 -1.0085 -1.0759 
O: -0.8856 0.0885 -0.0845 
0.0764 -1.1607 -0.0823 
-0.1376 -0.1348 -1.0848 
Eig. Value: -0.7955 -1.2378 -1.0978 
O: -1.2234 -0.2192 0.2503 
-0.2035 -0.9183 0.1132 
0.2615 0.1404 -1.0994 
Eig. Value: -1.5237 -0.8101 -0.9073 
H: 0.3572 -0.2306 -0.0499 
-0.1527 0.8865 0.2232 
-0.0368 0.2356 0.4123 
Eig. Value: 0.2789 1.0349 0.3423 
H: 0.4301 0.0248 0.1877 
-0.0207 0.3740 -0.1211 
0.2306 -0.0739 0.6935 
Eig. Value: 0.2835 0.3892 0.8249 
H: 0.8895 0.2955 -0.0408 
0.2889 0.4141 0.0162 
-0.0625 0.0110 0.2709 
Eig. Value: 1.0306 0.3065 0.2374 
H: 0.3944 0.0907 -0.2957 
0.0729 0.3744 -0.2105 
-0.3058 -0.2449 0.9015 
Eig. Value: 0.2460 0.3050 1.1193 
Na: 1.1276 -0.0217 0.0007 
-0.0362 1.0850 -0.0326 
0.0001 -0.0389 1.0410 
Eig. Value: 1.1453 1.0892 1.0191 
Cl: -1.0898 -0.0569 0.0321 
-0.0635 -1.0551 0.0442 
0.0505 0.0460 -1.1351 
Eig. Value: -1.1955 -1.0085 -1.0759 
O: -0.8856 -0.0885 -0.0845 
-0.0764 -1.1607 0.0823 
-0.1376 0.1348 -1.0848 
Eig. Value: -0.7955 -1.2378 -1.0978 
O: -1.2234 0.2192 0.2503 
0.2035 -0.9183 -0.1132 
0.2615 -0.1404 -1.0994 
Eig. Value: -1.5237 -0.8101 -0.9073 
H: 0.3572 0.2306 -0.0499 
0.1527 0.8865 -0.2232 
-0.0368 -0.2356 0.4123 
Eig. Value: 0.2789 1.0349 0.3423 
H: 0.4301 -0.0248 0.1877 
0.0207 0.3740 0.1211 
0.2306 0.0739 0.6935 
Eig. Value: 0.2835 0.3892 0.8249 
H: 0.8895 -0.2955 -0.0408 
-0.2889 0.4141 -0.0162 
-0.0625 -0.0110 0.2709 
Eig. Value: 1.0306 0.3065 0.2374 
H: 0.3944 -0.0907 -0.2957 
-0.0729 0.3744 0.2105 
-0.3058 0.2449 0.9015 
Eig. Value: 0.2460 0.3050 1.1193 
Atom type 

Dielectric tensors: 

 
Ɛ2.2795 0.0000 0.0000 
0.0000 2.2397 0.0000 
0.0000 0.0000 2.3193 
Eig. Value: 2.2795 2.2397 2.3193 
Refractive index (N): 1.5098 0.0000 0.0000 
0.0000 1.4966 0.0001 
0.0000 0.0001 1.5229 
Eig. Value: 1.5098 1.4966 1.5229 
Ɛ00.0000 0.0000 0.0000 
0.0000 0.0000 0.0000 
0.0000 0.0000 0.0000 
Eig. Value: 0.0000 0.0000 0.0000