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zxzj05(½ð±Ò+5):лл»ØÌû½»Á÷ 2010-04-04 20:40
vasp·Ö×Ó¶¯Á¦Ñ§Ä£Äâ¡£
ת×Ô£ºhttp://blog.163.com/ly0708@126/b ... 281201001181758620/
ת×Ô£ºhttp://muchong.com/bbs/viewthread.php?tid=1744011&fpage=0&view=&highlight=&page=1
vasp×ö·Ö×Ó¶¯Á¦Ñ§µÄºÃ´¦£¬ÓÉÓÚvaspÊǽüЩÄ꿪·¢µÄ±È½Ï³ÉÊìµÄÈí¼þ£¬ÔÚ×öµç×ÓscfËÙ¶È·½ÃæÓнϺõÄÓÅÊÆ¡£
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Ö÷ҪʹÓõÄϵ×ÛÊÇ NVT ºÍ NVE¡£
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EDIFF   Ò»°ãÀ´Ëµ£¬ÓÃ1E-4 »òÕß1E-5¶¼¿ÉÒÔ£¬Õâ¸ö²ÎÊýÖ»ÊǶԵÚÒ»¸öÀë×Ó²½µÄ×ÔÇ¢Ó°Ïì´óһЩ£¬¶ÔÓÚ³¤Ê±¼äµÄ·Ö×Ó¶¯Á¦Ñ§µÄÄ£Ä⣬¾«¶ÈСһµãÒ²ÎÞËùν£¬µ«²»ÄÜ̫С¡£
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POTIM=3  Ê±¼ä²½³¤,µ¥Î»fs, ͨ³£1µ½3.
ISIF=2  ¼ÆËãÍâ½çµÄѹÁ¦.
NBLOCK= 1  ¶àÉÙ¸öʱ¼ä²½³¤£¬Ð´Ò»´ÎCONTCAR£¬CHGºÍCHGCAR£¬PCDAT.
KBLOCK=50 NBLOCK*KBLOCK ¸ö²½³¤Ð´Ò»´Î XDATCAR.
ISMEAR=-1  ·ÑÃ×µÏÀ­¿Ë·Ö²¼.
SIGMA =0.05 µ¥Î»:µç×Ó·ü
NELMIN=8  Ò»°ãÓÃ6µ½8, ×îСµÄµç×ÓscfÊý.Ì«Éٵϰ,ÊÕÁ²µÄ²»ºÃ.
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APACO=10 ¾¶Ïò·Ö²¼º¯Êý¾àÀë, µ¥Î»Êǰ£.
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LCHARG=F ¾¡Á¿²»Ð´µçºÉÃܶÈ,·ñÔòCHGÎļþÌ«´ó.
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TEEND=300 ÖÕ̬ζȡ£ ²»ÉèµÄ»°£¬µÈÓÚTEBEG.
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NBLOCK= 1  Ö¸µÄÊǶàÉÙ¸öÀë×Ó²½£¨Ê±¼ä²½³¤Ö»ÊǶÔÓÚMD¶øÑÔ£¬¶ÔÓÚÆäËüµÄ¼ÆË㣬NBLOCKÒ²ÊÇÆð¿ØÖÆ×÷Óõģ©Ð´Ò»´ÎXDATCAR
KBLOCK=50 NBLOCK*KBLOCK ¸öÀë×Ó²½Ð´Ò»´ÎPCDAT.
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ת×Ô£ºhttp://blog.163.com/xiaowei_0905 ... 183592010099379680/
This file determines the kind of job which VASP will perform; single point energy calculation (SPE), geometry

optimisation (GO - coarse/fine), molecular dynamics (MD - nve/nvt), spin polarised calculation (mag).

Examples can

be found in /home/cs/model/vasp_util.

Example; INCAR.spe

$system = single point energy calc

NELMIN = 4 minimum number of electronic SCF cycles

EDIFF = 1E-6 stooping criterion for electronic convergence

NSW = 0 number of ionic shifts

ISMEAR = 0 treatment of partial occupancies of electronic levels

Example; INCAR.coarse

$system = coarse geom optimisation

NELMIN = 4

EDIFF = 1E-2

EDIFFG = -1E-2 stopping criterion for forces Fmax < 0.01 eV/A

IBRION = 2 minimisation method, good away from minimum

ISIF = 3 optimise coords and cell pars

LREAL =.TRUE. do calc in real space - quicker

ISTART = 0 start with a random wavefunction

NSW = 20 maximum of 20 ionic shifts

ISMEAR = 0

LCHARG =.FALSE. don't write CHG and CHGCAR files

Example; INCAR.fine

$system = geom optimisation

NELMIN = 4

EDIFF = 1E-6

EDIFFG = -1E-4

PREC = high increase energy cut-off by 25%

IBRION = 1 minimisation method, good close to minimum

ISIF = 3

NSW = 50

ISMEAR = 0

LCHARG=.FALSE.

Example; INCAR.mag

$system = collinear mag structure calc

IBRION = 1

ISIF = 3

NPAR = 1 forces mag structure to be written in output  file

EDIFF = 1E-6

EDIFFG = -1E-3

PREC = high

RWIGS = 1.376 0.900 1.233 1.302 radii for spherical integration of spin density, 1 per atom

ISPIN = 2     do spin polarised calc

       MAGMOM = 24*0 5 -5 -5 5    initial mag moments for 28 atoms

NSW = 20

Example; INCAR.nve

$system = molecular dynamics

ALGO = V

MAXMIX = 40

IBRION = 0   do molecular dynamics

NSW = 6000  number of time steps

NBLOCK = 1  store structure every time step

POTIM = 3.0  time step 3fs

TEBEG = 673  target temperature

ISYM = 0  turn off symmetry

SMASS = -3  NVE ensemble

LREAL =.TRUE.

LCHARG =.FALSE.

NELMIN = 4

PREC = LOW  reduce energy cut-off by 25% for MD

ISTART = 0

ISMEAR = 0; SIGMA=0.1

Example; INCAR.nvt

$system = molecular dynamics

ALGO = V

MAXMIX = 40

IBRION = 0

NSW = 6000

NBLOCK = 1

POTIM = 3.0

TEBEG = 673

ISYM = 0

SMASS = 2 NVT ensemble, value determines frequency of coupling to heat  bath

LREAL =.TRUE.

LCHARG =.FALSE.

NELMIN = 4

PREC = LOW

ISTART = 0

ISMEAR = 0; SIGMA=0.1

Example; INCAR.scale

$system = molecular dynamics quench

ALGO = V

MAXMIX = 40

IBRION = 0

NSW = 50

NBLOCK = 5 rescale temperature every 5 steps

POTIM = 3.0

TEBEG = 683 initial temp

TEEND = 673 final temp

ISYM = 0

SMASS = -1 MD with velocity scaling

LREAL =.TRUE.

LCHARG =.FALSE.

NELMIN = 4

PREC = LOW

ISTART = 0

ISMEAR = 0; SIGMA=0.1
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wo8165827

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The Alloy-Theoretic Automated Toolkit (ATAT) ¿ÉÓ¦ÓÃÓÚVASP£¬¼ÆË㼤·¢Ì¬

gavinliu7390(½ð±Ò+10):лл²ÎÓ룡 2010-04-06 11:18
The Alloy-Theoretic Automated Toolkit (ATAT) is a generic name that refers to a collection of alloy theory

tools:
•  A code to construct cluster expansions from first-principles (MAPS). A cluster expansion is a very compact and efficient expression giving the energy of an substitutional alloy as a function of its configuration (i.e. which type of atom sits where on the lattice).

•  A code to perform Monte Carlo simulation of lattice models in order to compute thermodynamic  properties of alloys starting from a cluster expansion.

•  Extension of the two above tools that allow the construction of so-called reciprocal-space cluster expansion, which are useful to model the energetics of alloys exhibiting a large atomic size mismatch.

•  Utilities to interface the above tools with first-principles codes (such as VASP).

•  Job control utilities that enable the efficient use of a cluster of workstations to run the first-principles codes that provide the input to the above codes.




¾ßÌå¿ÉÒÔ²ÎÕÕÍøÕ¾£º

http://www.its.caltech.edu/~avdw/atat/

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"Silicon"                    : cname
2                            : natoms
1                            : etype
140.0 450.0 1000             : vplt1, vplt2, nvplt
7                            : nevpt
165.8207473 -578.0660968
196.8383062 -578.1728409
231.5010189 -578.2305598
270.0113940 -578.2548962
312.5719400 -578.2566194
359.3851654 -578.2453281
410.6535788 -578.2253154
466.5796888 -578.2028836
ÊäÈë¹æÔò:
cname               : name of crystal up to 256 characters
natoms              : number of atoms in unit cell
etype               : equation of state type (see below)
vplt1, vplt2, nvplt : volume interval over which to plot energy, pressure etc.
                       as well as the number of points in the plot
nevpt               : number of energy-volume points to be inputted
vpt(i) ept(i)       : energy-volume points (atomic units)
Note that the input units are atomic - Bohr and Hartree (NOT Rydbergs). (×¢ÒⵥλÊÇBohrºÍHatree.
Ŀǰ¿ÉÒÔ½øÐÐÒÔÏÂÄâºÏ£º
1. Universal EOS (Vinet P et al., J. Phys.: Condens. Matter 1, p1941 (1989))
2. Murnaghan EOS (Murnaghan F D, Am. J. Math. 49, p235 (1937))
3. Birch-Murnaghan 3rd-order EOS (Birch F, Phys. Rev. 71, p809 (1947))
4. Birch-Murnaghan 4th-order EOS
5. Natural strain 3rd-order EOS (Poirier J-P and Tarantola A, Phys. Earth
    Planet Int. 109, p1 (1998))
6. Natural strain 4th-order EOS
7. Cubic polynomial in (V-V0)
10Â¥2010-04-04 13:24:55
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