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Difference between revisions of "CO on Ni 111 surface"

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Description: adsorb a CO molecule at the top site of a Ni (111) surface.
+
{{Sur_sci - Tutorial}}
  
----
+
== Task ==
*INCAR
+
Adsorbtion of a CO molecule at the top site of a Ni (111) surface.
<pre>
 
  ISTART = 0
 
  ICHARG = 2
 
 
 
general:
 
  SYSTEM = CO adsorption on Ni(111)
 
  ENMAX  = 400
 
  ISMEAR =    2  ; SIGMA = 0.2
 
  ALGO= Fast
 
 
 
dynamic:
 
  NSW=100
 
  POTIM = 0.2
 
  IBRION = 1
 
</pre>
 
  
*KPOINTS
+
== Input ==
<pre>
 
K-Points
 
0
 
Monkhorst-Pack
 
9 9 1
 
0 0 0
 
</pre>
 
  
*POSCAR
+
=== {{TAG|POSCAR}} ===
 
<pre>
 
<pre>
 
Ni - (111) + CO on-top
 
Ni - (111) + CO on-top
Line 46: Line 24:
 
   .33333333  .66666667  .60298866  T  T  T
 
   .33333333  .66666667  .60298866  T  T  T
 
</pre>
 
</pre>
 +
 +
*CO molecule put above surface atom "on-top".
 +
*<math>z_{\mathrm{C}}=(.540-.444)\cdot 5.196 \cdot 3.53 \approx 1.76</math> <math>\AA</math>.
 +
*<math>d_{\mathrm{CO}}=(.603-.540)\cdot 5.196 \cdot 3.53 \approx 1.16</math> <math>\AA</math>.
 +
 +
=== {{TAG|INCAR}} ===
 +
 +
  {{TAGBL|ISTART}} = 0
 +
  {{TAGBL|ICHARG}} = 2
 +
     
 +
general:
 +
  {{TAGBL|SYSTEM}} = CO adsorption on Ni(111)
 +
  {{TAGBL|ENMAX}}  = 400
 +
  {{TAGBL|ISMEAR}} =    2  ; {{TAGBL|SIGMA}} = 0.2
 +
  {{TAGBL|ALGO}}= Fast
 +
  {{TAGBL|EDIFF}} = 1E-6
 +
   
 +
dynamic:
 +
  {{TAGBL|NSW}}=100
 +
  {{TAGBL|POTIM}} = 0.2
 +
  {{TAGBL|IBRION}} = 1
 +
 +
=== {{TAG|KPOINTS}} ===
 +
<pre>
 +
K-Points
 +
0
 +
Monkhorst-Pack
 +
9 9 1
 +
0 0 0
 +
</pre>
 +
 +
== Calculation ==
 +
 +
*Two additional atom types (C and O) in the calculations: append C and O potentials to the {{TAG|POTCAR}} file.
 +
 +
*The sample output for the forces should look like the following:
 +
POSITION                                      TOTAL-FORCE (eV/Angst)
 +
-----------------------------------------------------------------------------------
 +
      0.00000      0.00000      0.00000        0.000000      0.000000      0.175780
 +
      0.00000      1.44112      2.03805        0.000000      0.000000    -0.104008
 +
      1.24804      0.72056      4.07609        0.000000      0.000000    -0.036305
 +
      0.00000      0.00000      6.10852        0.000000      0.000000    -0.083336
 +
      0.00000      1.44112      8.15366        0.000000      0.000000      0.009539
 +
      0.00000      1.44112      9.90873        0.000000      0.000000      0.011228
 +
      0.00000      1.44112    11.06339        0.000000      0.000000      0.027102
 +
-----------------------------------------------------------------------------------
 +
    total drift:                              -0.000093    -0.000213      0.019852
 +
 +
*Small outward relaxation of surface due to adsorption: <math> \Delta d_{12} = (8.154-6.109)/2.038 = 0.4 % </math>.
 +
 +
*CO geometry change: <math> d_{\mathrm{CO}} = 11.063 - 9.909 = 1.155 </math> <math>\AA</math>; <math> z_{\mathrm{C}} = 9.909 -8.154 = 1.755 </math> <math> \AA</math>.
 +
 +
*Visualize the structure using p4vasp:
 +
[[File:Fig CO on Ni111 1.png|500px]]
  
 
== Download ==
 
== Download ==
[http://www.vasp.at/vasp-workshop/examples/COonNi111_rel.tgz COonNi111_rel.tgz]
+
[[Media:COonNi111_rel.tgz| COonNi111_rel.tgz]]
 +
 +
{{Sur_sci}}
  
----
+
Back to the [[The_VASP_Manual|main page]].
[[VASP_example_calculations|To the list of examples]] or to the [[The_VASP_Manual|main page]]
 
  
 
[[Category:Examples]]
 
[[Category:Examples]]

Latest revision as of 09:55, 14 November 2019

Task

Adsorbtion of a CO molecule at the top site of a Ni (111) surface.

Input

POSCAR

Ni - (111) + CO on-top
  3.53
   .70710678  .0000000  .000000
 -0.35355339 0.6123724  .000000
   .000000    .000000  5.1961524
    5 1 1
selective dynamics
direct
   .00000000   .00000000   .00000000  F  F  F
   .33333333   .66666667   .11111111  F  F  F
   .66666667   .33333333   .22222222  F  F  F
   .00000000   .00000000   .33333333  T  T  T
   .33333333   .66666667   .44444444  T  T  T
   .33333333   .66666667   .54029062  T  T  T
   .33333333   .66666667   .60298866  T  T  T
  • CO molecule put above surface atom "on-top".
  • .
  • .

INCAR

  ISTART = 0
  ICHARG = 2
     
general:
  SYSTEM = CO adsorption on Ni(111)
  ENMAX  = 400
  ISMEAR =    2  ; SIGMA = 0.2
  ALGO= Fast
  EDIFF = 1E-6
    
dynamic:
  NSW=100
  POTIM = 0.2
  IBRION = 1

KPOINTS

K-Points
0
Monkhorst-Pack
9 9 1
0 0 0

Calculation

  • Two additional atom types (C and O) in the calculations: append C and O potentials to the POTCAR file.
  • The sample output for the forces should look like the following:
POSITION                                       TOTAL-FORCE (eV/Angst)
-----------------------------------------------------------------------------------
     0.00000      0.00000      0.00000         0.000000      0.000000      0.175780
     0.00000      1.44112      2.03805         0.000000      0.000000     -0.104008
     1.24804      0.72056      4.07609         0.000000      0.000000     -0.036305
     0.00000      0.00000      6.10852         0.000000      0.000000     -0.083336
     0.00000      1.44112      8.15366         0.000000      0.000000      0.009539
     0.00000      1.44112      9.90873         0.000000      0.000000      0.011228
     0.00000      1.44112     11.06339         0.000000      0.000000      0.027102
-----------------------------------------------------------------------------------
   total drift:                               -0.000093     -0.000213      0.019852
  • Small outward relaxation of surface due to adsorption: .
  • CO geometry change: ; .
  • Visualize the structure using p4vasp:

Fig CO on Ni111 1.png

Download

COonNi111_rel.tgz

Back to the main page.