Search found 18 matches

by nokimann
Mon Mar 06, 2023 7:44 am
Forum: VTSTTools
Topic: How to increase resolution of images in NEB method?
Replies: 2
Views: 2292

Re: How to increase resolution of images in NEB method?

graeme wrote: > You can certainly add more images by interpolation. It is best if you can > try to keep equal spacing, so for example, going from a 4 image to a 9 > image calculation. You can always keep the climbing image on. My purpose is to get the proper structures from the high-resolute images ...
by nokimann
Fri Mar 03, 2023 3:33 am
Forum: VTSTTools
Topic: How to increase resolution of images in NEB method?
Replies: 2
Views: 2292

How to increase resolution of images in NEB method?

Increasing images requires more computer resources. If we have multiple TS between locally stable images, we may split the one whole NEB run into separate NEB runs. However, how can I increase the resolution if I need more images, i.e., the high resolution? Can I run NEBs as if the following? 1. Run...
by nokimann
Sat Nov 17, 2018 9:08 pm
Forum: VTSTTools
Topic: Is there any way to create non-overlapping images for NEB?
Replies: 2
Views: 11784

Re: Is there any way to create non-overlapping images for NEB?

Then, I'll need to check ASE.

Thank you, professor.
by nokimann
Sat Nov 17, 2018 9:21 am
Forum: VTSTTools
Topic: Is there any way to create non-overlapping images for NEB?
Replies: 2
Views: 11784

Is there any way to create non-overlapping images for NEB?

Hi, VTSTTools I'm trying to create images from trans to cis transition. But some of the structures created in the image seem to cause a warning message. | The distance between some ions is very small | | please check the nearest neighbor list in the OUTCAR file | | I HOPE YOU KNOW, WHAT YOU ARE DOIN...
by nokimann
Sun Oct 14, 2018 3:37 pm
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Re: Divergence of NEB calculation

Thank you, professor.
by nokimann
Sat Oct 06, 2018 4:31 am
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Re: Divergence of NEB calculation

These are your comments. And I added queries for each comment. - Make sure that you relax with a force criterion (EDIFFG < 0) -- The relaxed endpoints are quite different in the attached path because of this I searched the meaning of this Tag, and it means "If EDIFFG is negative it has a differ...
by nokimann
Tue Oct 02, 2018 6:10 pm
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Re: Divergence of NEB calculation

I've prepared four calculations. 0_NEB is the 1st one, and 3_NEB is the last one. Below is the description of what I did. 0_NEB: the first initial and final trial POSCAR, POTIM=0.01 not convergent for the calculation images seem to be divergent. (See each CONTCAR in the image folder) 1_NEB: the init...
by nokimann
Fri Sep 28, 2018 11:25 am
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Re: Divergence of NEB calculation

Preparing the example for you.
By the way, I wonder the difference between inserting OUTCARs into 00 and 04 (if IMAGES = 4) folders and not.
by nokimann
Mon Sep 24, 2018 3:24 pm
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Re: Divergence of NEB calculation

I'm still suffering from the divergence. I guessed the reason is that the two C2H4 want to be separated from one another until all C2H4 has the same distance, considering the adjacent cells. And, then I expand the cell size to lower the interaction between nearest cells, but it takes too long time t...
by nokimann
Mon Sep 17, 2018 1:57 pm
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Re: Divergence of NEB calculation

You said 'forces,' but what did you mean by 'forces'?
+ How can I check that and before or after the NEB calculation?
And 'small time step' means the TIME-tag?
by nokimann
Sun Sep 16, 2018 4:40 pm
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Re: Divergence of NEB calculation

I read a few posts. They mostly said "adjust POTIM and IBRION."
But I want to know how I can decide the value of POTIM and IBRION for all cases?
Does personal experience just govern it?
by nokimann
Sun Sep 16, 2018 1:11 pm
Forum: VTSTTools
Topic: Divergence of NEB calculation
Replies: 13
Views: 34576

Divergence of NEB calculation

I tested twice a straightforward example of the chemical reaction 2 C2H4 ---> C4H8 with different INCARs Here is my first divergent INCAR SYSTEM = NEB NCORE = 4 ISTART = 0 ICHARG = 2 ENCUT = 550.0 EDIFF = 0.1E-02 NSW = 250 IBRION = 1 ISIF = 2 ISYM = 1 POTIM = 0.5000 ISMEAR = -5 IALGO = 38 LWAVE = .F...
by nokimann
Wed Sep 12, 2018 1:41 pm
Forum: VTSTTools
Topic: Compile VASP 5.4.4 with VTST-176
Replies: 9
Views: 29484

Re: Compile VASP 5.4.4 with VTST-176

Gotcha! I've solved the problem. It was my stupid mistake.
The problem was the double chain.o inside .object file.

Thank you so much, graeme! I learn about many things by this by the way.
All I have to do is to enjoy NEB~
by nokimann
Wed Sep 12, 2018 1:11 pm
Forum: VTSTTools
Topic: Compile VASP 5.4.4 with VTST-176
Replies: 9
Views: 29484

Re: Compile VASP 5.4.4 with VTST-176

Oops! I found out that there are two chain.o in the .object file. One is for SOURCE, and the another is for SOURCE_GPU. I wrote extra *.o variable on the SOURCE_GPU. This might cause the error? And could you let me know the command `make veryclean`? It just removes all files in `build` folder, right...
by nokimann
Tue Sep 11, 2018 3:44 pm
Forum: VTSTTools
Topic: Compile VASP 5.4.4 with VTST-176
Replies: 9
Views: 29484

Re: Compile VASP 5.4.4 with VTST-176

First, `make clean` doesn't work in VASP folder. (Ok, I'm not good at programming C++, however, I read about make command that if I want to use 'clean' option, requires predefinition in 'makefile' or 'makefile.include') Second, what do you mean by removing chain.o before making the VTST version? Cou...