Search found 5 matches
- Tue Dec 05, 2017 7:45 am
- Forum: VTSTTools
- Topic: The abnormal and negative NEB energy profile
- Replies: 4
- Views: 16557
Re: The abnormal and negative NEB energy profile
Dear graeme, I highly appreciate for your comments. I learned much from your comments and finally obtain the reasonable energy profile. Thanks again!
- Sat Dec 02, 2017 9:09 am
- Forum: VTSTTools
- Topic: The abnormal and negative NEB energy profile
- Replies: 4
- Views: 16557
The abnormal and negative NEB energy profile
Deal all, I obtained an abnormal and negative energy profile of the phase transition from beta-Ti to alpha-Ti. In general, there is no energy barrier for this phases transitions. However, the flat and descend energy profile may be changed when some additive elements are added. I want to obtain the f...
- Fri Feb 21, 2014 4:06 am
- Forum: VTSTTools
- Topic: non-symmetric CI-NEB profile
- Replies: 4
- Views: 11235
Re: non-symmetric CI-NEB profile
Dear graeme, very thanks for your help! I also obtained the nice symmetric barrier profile of Zr migration mediated by Al-cacancy with IALGO=38. The non-symmetric profile is indeedly related to the electronic converging problem of Zr. Thanks again.
- Wed Feb 19, 2014 2:20 am
- Forum: VTSTTools
- Topic: non-symmetric CI-NEB profile
- Replies: 4
- Views: 11235
Re: non-symmetric CI-NEB profile
Dear graeme, thanks for you kind reply! As your suggestions, I set ISYM=0 and used the following low precision setting: 2x2x2 k-point mesh, PREC=normal, ENCUT=250 eV and EDIFFG=-0.1. However, the CI-NEB profile is still non-symmetric and looks more strange, as the following figure illustrated: [atta...
- Tue Feb 18, 2014 12:08 pm
- Forum: VTSTTools
- Topic: non-symmetric CI-NEB profile
- Replies: 4
- Views: 11235
non-symmetric CI-NEB profile
[attachment=0]ci-neb.jpg[/attachment]Dear graeme and others: I want to obtain the migration energy of Zr mediated by Al-vacancy in Al matrix with vasp5.3 and vtst 3.0c. However, the CI-NEB profile looks strange to me: the migration barrier of Zr is very high and the CI-NEB profile is non-symmetric. ...