-    STUDTITE     -    UO44H2O

The crystal structure is fully relaxed (both unit cell parameters and atomic positions under symmetry constraints) starting from an experimental structure similar to the one reported in AMCSD

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:  15  C2/c 
Lattice parameters (Å):  14.0680  6.7210  8.4280 
Angles (°):  90  123.356  90 

Symmetry (theoretical): 

Space group:  15  C2/c 
Lattice parameters (Å):  7.3236  7.3236  8.6947 
Angles (°):  59.28  120.71  123.77 

Cell contents: 

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

Atomic positions (theoretical):

U:  0.0000  0.0000  0.0000 
O:  0.7171  0.6733  0.1099 
O:  0.2194  0.0845  0.3078 
O:  0.2768  0.8206  0.1807 
O:  0.3377  0.6554  0.0294 
H:  0.3112  0.7496  0.3265 
H:  0.3212  0.7598  0.1239 
H:  0.5115  0.6694  0.0694 
H:  0.2489  0.4899  0.0874 
U:  0.0000  0.0000  0.5000 
O:  0.6733  0.7171  0.3901 
O:  0.0845  0.2194  0.1922 
O:  0.8206  0.2768  0.3193 
O:  0.6554  0.3377  0.4706 
H:  0.7496  0.3112  0.1735 
H:  0.7598  0.3212  0.3761 
H:  0.6694  0.5115  0.4306 
H:  0.4899  0.2489  0.4126 
O:  0.2829  0.3267  0.8901 
O:  0.7806  0.9155  0.6922 
O:  0.7232  0.1794  0.8193 
O:  0.6623  0.3446  0.9706 
H:  0.6888  0.2504  0.6735 
H:  0.6788  0.2402  0.8761 
H:  0.4885  0.3306  0.9306 
H:  0.7511  0.5101  0.9126 
O:  0.3267  0.2829  0.6099 
O:  0.9155  0.7806  0.8078 
O:  0.1794  0.7232  0.6807 
O:  0.3446  0.6623  0.5294 
H:  0.2504  0.6888  0.8265 
H:  0.2402  0.6788  0.6239 
H:  0.3306  0.4885  0.5694 
H:  0.5101  0.7511  0.5874 
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): 

U: 4.9816 -0.5781 -0.9683 
0.1864 3.4419 -0.1858 
-0.8992 1.1977 5.9540 
Eig. Value: 4.4232 3.3436 6.6107 
O: -1.5755 -0.4542 0.1021 
-0.5807 -2.1483 0.1176 
0.1895 0.3685 -1.2092 
Eig. Value: -1.2705 -2.5148 -1.1477 
O: -0.9197 -0.2803 0.7568 
-0.6132 -0.7762 -0.5882 
0.7098 -0.2898 -1.8264 
Eig. Value: -0.0203 -1.2452 -2.2568 
O: -2.3457 -0.0160 -0.3202 
-0.2734 -0.6438 0.0586 
-0.2552 -0.0923 -1.9470 
Eig. Value: -2.5063 -0.6315 -1.7987 
O: -2.0959 -0.3815 0.0241 
-0.7787 -1.9061 -0.2752 
0.2360 0.0890 -1.6302 
Eig. Value: -2.5905 -1.3321 -1.7097 
H: 0.2264 -0.1299 0.5271 
0.1410 0.3957 -0.2335 
-0.0700 -0.1765 2.2362 
Eig. Value: 0.1962 0.3783 2.2837 
H: 2.1599 -0.1463 -1.0375 
0.1556 0.3721 0.0332 
-0.4052 0.1797 0.5309 
Eig. Value: 2.4340 0.4306 0.1983 
H: 1.7086 1.2191 0.3031 
1.6528 1.6388 0.5151 
-0.0521 0.0712 0.3553 
Eig. Value: 3.1413 0.1517 0.4097 
H: 0.3511 -0.3898 0.1286 
-0.2606 1.3469 -0.4072 
0.0968 -0.5419 0.5135 
Eig. Value: 0.2439 1.6521 0.3155 
U: 4.9816 0.5781 -0.9683 
-0.1864 3.4419 0.1858 
-0.8992 -1.1977 5.9540 
Eig. Value: 4.4232 3.3436 6.6107 
O: -1.5755 0.4541 0.1021 
0.5807 -2.1483 -0.1176 
0.1895 -0.3685 -1.2092 
Eig. Value: -1.2705 -2.5148 -1.1477 
O: -0.9197 0.2803 0.7568 
0.6132 -0.7762 0.5882 
0.7098 0.2898 -1.8264 
Eig. Value: -0.0203 -1.2452 -2.2568 
O: -2.3457 0.0160 -0.3203 
0.2734 -0.6438 -0.0586 
-0.2552 0.0923 -1.9470 
Eig. Value: -2.5063 -0.6315 -1.7987 
O: -2.0959 0.3815 0.0241 
0.7787 -1.9061 0.2752 
0.2360 -0.0890 -1.6302 
Eig. Value: -2.5905 -1.3321 -1.7097 
H: 0.2264 0.1299 0.5271 
-0.1410 0.3957 0.2335 
-0.0700 0.1765 2.2362 
Eig. Value: 0.1962 0.3783 2.2837 
H: 2.1599 0.1463 -1.0375 
-0.1556 0.3721 -0.0332 
-0.4052 -0.1797 0.5309 
Eig. Value: 2.4340 0.4306 0.1983 
H: 1.7086 -1.2191 0.3031 
-1.6528 1.6388 -0.5151 
-0.0521 -0.0712 0.3553 
Eig. Value: 3.1413 0.1517 0.4097 
H: 0.3511 0.3898 0.1286 
0.2606 1.3469 0.4072 
0.0968 0.5419 0.5135 
Eig. Value: 0.2439 1.6521 0.3155 
O: -1.5755 -0.4541 0.1021 
-0.5807 -2.1483 0.1176 
0.1895 0.3685 -1.2092 
Eig. Value: -1.2705 -2.5148 -1.1477 
O: -0.9197 -0.2803 0.7568 
-0.6132 -0.7762 -0.5882 
0.7098 -0.2898 -1.8264 
Eig. Value: -0.0203 -1.2452 -2.2568 
O: -2.3457 -0.0160 -0.3202 
-0.2734 -0.6438 0.0586 
-0.2552 -0.0923 -1.9470 
Eig. Value: -2.5063 -0.6315 -1.7987 
O: -2.0959 -0.3815 0.0241 
-0.7787 -1.9061 -0.2752 
0.2360 0.0890 -1.6302 
Eig. Value: -2.5905 -1.3321 -1.7097 
H: 0.2264 -0.1299 0.5271 
0.1410 0.3957 -0.2335 
-0.0700 -0.1765 2.2362 
Eig. Value: 0.1962 0.3783 2.2837 
H: 2.1599 -0.1463 -1.0375 
0.1556 0.3721 0.0332 
-0.4052 0.1797 0.5309 
Eig. Value: 2.4340 0.4306 0.1983 
H: 1.7086 1.2191 0.3031 
1.6528 1.6388 0.5151 
-0.0521 0.0712 0.3553 
Eig. Value: 3.1413 0.1517 0.4097 
H: 0.3511 -0.3898 0.1286 
-0.2606 1.3469 -0.4072 
0.0968 -0.5419 0.5135 
Eig. Value: 0.2439 1.6521 0.3155 
O: -1.5755 0.4542 0.1021 
0.5807 -2.1483 -0.1176 
0.1895 -0.3685 -1.2092 
Eig. Value: -1.2705 -2.5148 -1.1477 
O: -0.9197 0.2803 0.7568 
0.6132 -0.7762 0.5882 
0.7098 0.2898 -1.8264 
Eig. Value: -0.0203 -1.2452 -2.2568 
O: -2.3457 0.0160 -0.3202 
0.2734 -0.6438 -0.0586 
-0.2552 0.0923 -1.9470 
Eig. Value: -2.5063 -0.6315 -1.7987 
O: -2.0959 0.3815 0.0241 
0.7787 -1.9061 0.2752 
0.2360 -0.0890 -1.6302 
Eig. Value: -2.5905 -1.3321 -1.7097 
H: 0.2264 0.1299 0.5271 
-0.1410 0.3957 0.2335 
-0.0700 0.1765 2.2362 
Eig. Value: 0.1962 0.3783 2.2837 
H: 2.1599 0.1463 -1.0375 
-0.1556 0.3721 -0.0332 
-0.4052 -0.1797 0.5309 
Eig. Value: 2.4340 0.4306 0.1983 
H: 1.7086 -1.2191 0.3031 
-1.6528 1.6388 -0.5151 
-0.0521 -0.0712 0.3553 
Eig. Value: 3.1413 0.1517 0.4097 
H: 0.3511 0.3898 0.1286 
0.2606 1.3469 0.4072 
0.0968 0.5419 0.5135 
Eig. Value: 0.2439 1.6521 0.3155 
Atom type 

Dielectric tensors: 

 
Ɛ5.3703 0.0000 0.0000 
0.0000 4.4518 0.0000 
0.0000 0.0000 5.4329 
Eig. Value: 5.3703 4.4518 5.4329 
Refractive index (N): 2.3174 0.0000 0.0000 
0.0000 2.1099 0.0000 
0.0000 0.0000 2.3309 
Eig. Value: 2.3174 2.1099 2.3309 
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