Search found 14 matches
- Wed Apr 19, 2023 5:09 pm
- Forum: VTSTTools
- Topic: How NEB works when atoms are fixed?
- Replies: 3
- Views: 7107
Re: How NEB works when atoms are fixed?
Hello Professor, Thanks for your reply. To clarify, let's say I have a crystal structure of NVPF with 278 atoms, and I want to study the migration of Na ions from a stable structure to a state where this Na ion may leave the cell. I relaxed the initial structure with ISIF = 3 up to 0.01 ev/A and the...
- Thu Apr 13, 2023 6:04 am
- Forum: VTSTTools
- Topic: How NEB works when atoms are fixed?
- Replies: 3
- Views: 7107
How NEB works when atoms are fixed?
Hello, I am confused about how CI-NEB works when atoms' coordinates are fixed on POSCAR using F F F. For example, a few examples in the forum relaxed the initial and final structures using ISIF=3, but the transition states made by nebmake.pl have all fixed atoms. Though ISIF=2 is used (degree of fre...
- Mon Mar 06, 2023 4:20 pm
- Forum: VTSTTools
- Topic: High Migration Energy Barrier
- Replies: 6
- Views: 6558
Re: High Migration Energy Barrier
Hello Professor,
Any suggestions? I couldn't be able to solve this problem.
Musanna
Any suggestions? I couldn't be able to solve this problem.
Musanna
- Fri Feb 24, 2023 9:44 pm
- Forum: VTSTTools
- Topic: High Migration Energy Barrier
- Replies: 6
- Views: 6558
Re: High Migration Energy Barrier
Hello Professor, I relaxed the end point using the same setting. However, still the energy barrier seems wrong. Also, the fifth images force and energy are not converging for some reason which is not related to end point relaxation , i think. I am a bit confused now! Can you please a take a look? I ...
- Sat Feb 18, 2023 9:58 pm
- Forum: VTSTTools
- Topic: High Migration Energy Barrier
- Replies: 6
- Views: 6558
Re: High Migration Energy Barrier
Hello Prof. Henkelman, I added all the files this time. Images 0 to 4 seems converging but image 5 is diverging for some reason. Can you please give your suggestions on this? My input file is : SYSTEM = NEB-Calc ISYM = 0 # switch on symmetry ISTART = 0 ICHARG = 2 IALGO = 38 #PREC = ACCURATE # Advise...
- Sun Feb 12, 2023 7:25 pm
- Forum: VTSTTools
- Topic: High Migration Energy Barrier
- Replies: 6
- Views: 6558
High Migration Energy Barrier
Dear Prof. Henkelman,
I am confused with the high energy barrier (5 eV). Is it physically possible or i am missing something? Please give your suggestion on it. I am adding the files here.
Thank you very much.
Musanna
I am confused with the high energy barrier (5 eV). Is it physically possible or i am missing something? Please give your suggestion on it. I am adding the files here.
Thank you very much.
Musanna
- Wed Jul 13, 2022 6:24 am
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
Re: NEB converge problem with different number of images
Hello Professor, Thanks for the reply. I checked the movie and the cell was shrinking. I optimized the structure again and added the initial structure here. Though all atoms are not converging below 0.01 ev/A, the free atoms are converging below 0.01ev/A. Should I consider the attached path reasonab...
- Thu Jun 30, 2022 7:01 pm
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
Re: NEB converge problem with different number of images
Hello Professor, Thanks for the reply. I tried to optimize my initial and final image with a few trials. Though all atoms are not converging below 0.01 ev/A, the free atoms are converging around 0.01ev/A. I attached the plots and files here. Can I use these as reasonable initial bands? Also, for the...
- Wed Jun 15, 2022 5:29 am
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
Re: NEB converge problem with different number of images
Thanks for the reply. The idea is the atom will be diffused away from the surface. That's why I removed the atom from the final image (atom 22 is deleted in image 11) and relaxed it then. Therefore, can you kindly suggest what should I do next? Also, the intermediate images are not converging even a...
- Mon Jun 13, 2022 10:56 pm
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
Re: NEB converge problem with different number of images
Dear Professor Graeme Henkelman, I completed another set of simulations but couldn't interpret the migration barrier plot and why there are multiple saddle points along the path. Can you kindly take a look? I am adding the simulation files and the plot here. Also using nebefs.pl, the images (1,5,8,9...
- Thu Jun 02, 2022 6:59 am
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
Re: NEB converge problem with different number of images
Dear Professor Graeme Henkelman,
Thanks for the reply. I am adding the updated simulation with the endpoint here. Still, the NEB plot seems wrong to me. Can you kindly give me some suggestions on it?
Regards,
Musanna
Thanks for the reply. I am adding the updated simulation with the endpoint here. Still, the NEB plot seems wrong to me. Can you kindly give me some suggestions on it?
Regards,
Musanna
- Sun May 29, 2022 7:42 pm
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
Re: NEB converge problem with different number of images
Dear Professor Graeme Henkelman, Thanks for the reply. I am working on adding the endpoint outcar using the following INCAR General: SYSTEM = O deposition on Zn surface ISTART = 0 !begin from scratch ICHARG = 2 !Default: ICHARG = 2 , if ISTART=0, the initial charge distribution are the atomic charge...
- Sat May 28, 2022 4:15 pm
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
Re: NEB converge problem with different number of images
Dear Professor Graeme Henkelman, Thanks for the reply. I am adding the updated file with folder 11. However, I didn't add the OUTCAR in that as I am confused about how to optimize the endpoint. Is it cell relaxation with ISIF=3? I am also adding the migration energy barrier plots for the two cases. ...
- Sat May 28, 2022 12:10 am
- Forum: VTSTTools
- Topic: NEB converge problem with different number of images
- Replies: 15
- Views: 20475
NEB converge problem with different number of images
Dear Professor Graeme Henkelman, I am trying to do a cNEB calculation of the Zn atom. I used 2 different setup ( 1st case: images =5, EDIFFG=-0.1, NSW=500 and 2nd case: images = 10 EDIFFG = -0.01,NSW=2000). The migration energy barrier plots are totally different and don't make any sense to me. Also...