forked from lijiext/lammps
62 lines
3.8 KiB
Plaintext
62 lines
3.8 KiB
Plaintext
# Tersoff parameters for various elements and mixtures
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# multiple entries can be added to this file, LAMMPS reads the ones it needs
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# these entries are in LAMMPS "metal" units:
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# A,B = eV; lambda1,lambda2,lambda3 = 1/Angstroms; R,D = Angstroms
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# other quantities are unitless
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# Aidan Thompson (athomps at sandia.gov) takes full blame for this
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# file. It specifies various potentials published by J. Tersoff for
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# silicon, carbon and germanium. Since Tersoff published several
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# different silicon potentials, I refer to them using atom types
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# Si(B), Si(C) and Si(D). The last two are almost almost identical but
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# refer to two different publications. These names should be used in
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# the LAMMPS command when the file is invoked. For example:
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# pair_coeff * * SiCGe.tersoff Si(B). The Si(D), C and Ge potentials
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# can be used pure silicon, pure carbon, pure germanium, binary SiC,
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# and binary SiGe, but not binary GeC or ternary SiGeC. LAMMPS will
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# generate an error if this file is used with any combination
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# involving C and Ge, since there are no entries for the GeC
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# interactions (Tersoff did not publish parameters for this
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# cross-interaction.)
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# format of a single entry (one or more lines):
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# element 1, element 2, element 3,
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# m, gamma, lambda3, c, d, costheta0, n, beta, lambda2, B, R, D, lambda1, A
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# The original Tersoff potential for Silicon, Si(B)
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# J. Tersoff, PRB, 37, 6991 (1988)
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Si(B) Si(B) Si(B) 3.0 1.0 1.3258 4.8381 2.0417 0.0000 22.956
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0.33675 1.3258 95.373 3.0 0.2 3.2394 3264.7
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# The later Tersoff potential for Silicon, Si(C)
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# J. Tersoff, PRB, 38, 9902 (1988)
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Si(C) Si(C) Si(C) 3.0 1.0 1.7322 1.0039e5 16.218 -0.59826 0.78734
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1.0999e-6 1.7322 471.18 2.85 0.15 2.4799 1830.8
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# The later Tersoff potential for Carbon, Silicon, and Germanium
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# J. Tersoff, PRB, 39, 5566 (1989) + errata (PRB 41, 3248)
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# The Si and C parameters are very close to those in SiC.tersoff
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C C C 3.0 1.0 0.0 3.8049e4 4.3484 -0.57058 0.72751 1.5724e-7 2.2119 346.74 1.95 0.15 3.4879 1393.6
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Si(D) Si(D) Si(D) 3.0 1.0 0.0 1.0039e5 16.217 -0.59825 0.78734 1.1000e-6 1.7322 471.18 2.85 0.15 2.4799 1830.8
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Ge Ge Ge 3.0 1.0 0.0 1.0643e5 15.652 -0.43884 0.75627 9.0166e-7 1.7047 419.23 2.95 0.15 2.4451 1769.0
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C Si(D) Si(D) 3.0 1.0 0.0 3.8049e4 4.3484 -0.57058 0.72751 1.5724e-7 1.97205 395.1451 2.3573 0.1527 2.9839 1597.3111
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C Si(D) C 3.0 1.0 0.0 3.8049e4 4.3484 -0.57058 0.72751 1.5724e-7 0.0 0.0 1.95 0.15 0.0 0.0
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C C Si(D) 3.0 1.0 0.0 3.8049e4 4.3484 -0.57058 0.72751 1.5724e-7 0.0 0.0 2.3573 0.1527 0.0 0.0
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Si(D) C C 3.0 1.0 0.0 1.0039e5 16.217 -0.59825 0.78734 1.1000e-6 1.97205 395.1451 2.3573 0.1527 2.9839 1597.3111
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Si(D) Si(D) C 3.0 1.0 0.0 1.0039e5 16.217 -0.59825 0.78734 1.1000e-6 0.0 0.0 2.3573 0.1527 0.0 0.0
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Si(D) C Si(D) 3.0 1.0 0.0 1.0039e5 16.217 -0.59825 0.78734 1.1000e-6 0.0 0.0 2.85 0.15 0.0 0.0
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Si(D) Ge Ge 3.0 1.0 0.0 1.0039e5 16.217 -0.59825 0.78734 1.1000e-6 1.71845 444.7177 2.8996 0.1500 2.4625 1799.6347
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Si(D) Si(D) Ge 3.0 1.0 0.0 1.0039e5 16.217 -0.59825 0.78734 1.1000e-6 0.0 0.0 2.8996 0.1500 0.0 0.0
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Si(D) Ge Si(D) 3.0 1.0 0.0 1.0039e5 16.217 -0.59825 0.78734 1.1000e-6 0.0 0.0 2.85 0.15 0.0 0.0
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Ge Si(D) Si(D) 3.0 1.0 0.0 1.0643e5 15.652 -0.43884 0.75627 9.0166e-7 1.71845 444.7177 2.8996 0.1500 2.4625 1799.6347
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Ge Si(D) Ge 3.0 1.0 0.0 1.0643e5 15.652 -0.43884 0.75627 9.0166e-7 0.0 0.0 2.95 0.15 0.0 0.0
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Ge Ge Si(D) 3.0 1.0 0.0 1.0643e5 15.652 -0.43884 0.75627 9.0166e-7 0.0 0.0 2.8996 0.1500 0.0 0.0
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