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MEAM_LAMMPS_JangSeolLee_2019_CaZnMg__MO_708495328010_002

Interatomic potential for Calcium (Ca), Magnesium (Mg), Zinc (Zn).
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Title
A single sentence description.
MEAM Potential for the Ca-Zn-Mg system developed by Jang, Seol and Lee (2019) v002
Citations

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Description
A short description of the Model describing its key features including for example: type of model (pair potential, 3-body potential, EAM, etc.), modeled species (Ac, Ag, ..., Zr), intended purpose, origin, and so on.
An interatomic potential for the Mg-Zn-Ca ternary system. The development was based on the second nearest-neighbor modified embedded-atom method formalism, combining previously developed Mg-Zn and Mg-Ca potentials with the newly developed Zn-Ca binary potential. The Zn-Ca and Mg-Zn-Ca potentials reproduce structural, elastic, and thermodynamic properties of compounds and solution phases of relevant alloy systems in reasonable agreement with experimental data, first-principles and CALPHAD calculations. In original paper (Jang et al., Calphad, 67:101674, 2019), the applicability of the developed potentials is demonstrated through calculations of the effects of Zn and Ca solutes on the generalized stacking fault energy for various slip systems, segregation energy on twin boundaries, and volumetric misfit strain
Species
The supported atomic species.
Ca, Mg, Zn
Disclaimer
A statement of applicability provided by the contributor, informing users of the intended use of this KIM Item.
None
Content Origin http://cmse.postech.ac.kr/home_2nnmeam
Contributor Hyo-Sun Jang
Maintainer Hyo-Sun Jang
Developer Hyo-Sun Jang
Donghyuk Seol
Byeong-Joo Lee
Published on KIM 2023
How to Cite

This Model originally published in [1] is archived in OpenKIM [2-5].

[1] Jang H-S, Seol D, Lee B-J. Modified embedded-atom method interatomic potential for the Mg–Zn–Ca ternary system. Calphad. 2019;67:101674. doi:10.1016/j.calphad.2019.101674 — (Primary Source) A primary source is a reference directly related to the item documenting its development, as opposed to other sources that are provided as background information.

[2] Jang H-S, Seol D, Lee B-J. MEAM Potential for the Ca-Zn-Mg system developed by Jang, Seol and Lee (2019) v002. OpenKIM; 2023. doi:10.25950/df3b7525

[3] Afshar Y, Hütter S, Rudd RE, Stukowski A, Tipton WW, Trinkle DR, et al. The modified embedded atom method (MEAM) potential v002. OpenKIM; 2023. doi:10.25950/ee5eba52

[4] Tadmor EB, Elliott RS, Sethna JP, Miller RE, Becker CA. The potential of atomistic simulations and the Knowledgebase of Interatomic Models. JOM. 2011;63(7):17. doi:10.1007/s11837-011-0102-6

[5] Elliott RS, Tadmor EB. Knowledgebase of Interatomic Models (KIM) Application Programming Interface (API). OpenKIM; 2011. doi:10.25950/ff8f563a

Click here to download the above citation in BibTeX format.
Funding Not available
Short KIM ID
The unique KIM identifier code.
MO_708495328010_002
Extended KIM ID
The long form of the KIM ID including a human readable prefix (100 characters max), two underscores, and the Short KIM ID. Extended KIM IDs can only contain alpha-numeric characters (letters and digits) and underscores and must begin with a letter.
MEAM_LAMMPS_JangSeolLee_2019_CaZnMg__MO_708495328010_002
DOI 10.25950/df3b7525
https://doi.org/10.25950/df3b7525
https://commons.datacite.org/doi.org/10.25950/df3b7525
KIM Item Type
Specifies whether this is a Portable Model (software implementation of an interatomic model); Portable Model with parameter file (parameter file to be read in by a Model Driver); Model Driver (software implementation of an interatomic model that reads in parameters).
Portable Model using Model Driver MEAM_LAMMPS__MD_249792265679_002
DriverMEAM_LAMMPS__MD_249792265679_002
KIM API Version2.2
Potential Type meam
Previous Version MEAM_LAMMPS_JangSeolLee_2019_CaZnMg__MO_708495328010_001

(Click here to learn more about Verification Checks)

Grade Name Category Brief Description Full Results Aux File(s)
P vc-species-supported-as-stated mandatory
The model supports all species it claims to support; see full description.
Results Files
P vc-periodicity-support mandatory
Periodic boundary conditions are handled correctly; see full description.
Results Files
P vc-permutation-symmetry mandatory
Total energy and forces are unchanged when swapping atoms of the same species; see full description.
Results Files
A vc-forces-numerical-derivative consistency
Forces computed by the model agree with numerical derivatives of the energy; see full description.
Results Files
N/A vc-dimer-continuity-c1 informational
The energy versus separation relation of a pair of atoms is C1 continuous (i.e. the function and its first derivative are continuous); see full description.
Results Files
P vc-objectivity informational
Total energy is unchanged and forces transform correctly under rigid-body translation and rotation; see full description.
Results Files
P vc-inversion-symmetry informational
Total energy is unchanged and forces change sign when inverting a configuration through the origin; see full description.
Results Files
P vc-thread-safe mandatory
The model returns the same energy and forces when computed in serial and when using parallel threads for a set of configurations. Note that this is not a guarantee of thread safety; see full description.
Results Files
P vc-unit-conversion mandatory
The model is able to correctly convert its energy and/or forces to different unit sets; see full description.
Results Files


BCC Lattice Constant

This bar chart plot shows the mono-atomic body-centered cubic (bcc) lattice constant predicted by the current model (shown in the unique color) compared with the predictions for all other models in the OpenKIM Repository that support the species. The vertical bars show the average and standard deviation (one sigma) bounds for all model predictions. Graphs are generated for each species supported by the model.

Species: Mg
Species: Zn
Species: Ca


Cohesive Energy Graph

This graph shows the cohesive energy versus volume-per-atom for the current mode for four mono-atomic cubic phases (body-centered cubic (bcc), face-centered cubic (fcc), simple cubic (sc), and diamond). The curve with the lowest minimum is the ground state of the crystal if stable. (The crystal structure is enforced in these calculations, so the phase may not be stable.) Graphs are generated for each species supported by the model.

Species: Mg
Species: Zn
Species: Ca


Diamond Lattice Constant

This bar chart plot shows the mono-atomic face-centered diamond lattice constant predicted by the current model (shown in the unique color) compared with the predictions for all other models in the OpenKIM Repository that support the species. The vertical bars show the average and standard deviation (one sigma) bounds for all model predictions. Graphs are generated for each species supported by the model.

Species: Zn
Species: Mg
Species: Ca


Dislocation Core Energies

This graph shows the dislocation core energy of a cubic crystal at zero temperature and pressure for a specific set of dislocation core cutoff radii. After obtaining the total energy of the system from conjugate gradient minimizations, non-singular, isotropic and anisotropic elasticity are applied to obtain the dislocation core energy for each of these supercells with different dipole distances. Graphs are generated for each species supported by the model.

(No matching species)

FCC Elastic Constants

This bar chart plot shows the mono-atomic face-centered cubic (fcc) elastic constants predicted by the current model (shown in blue) compared with the predictions for all other models in the OpenKIM Repository that support the species. The vertical bars show the average and standard deviation (one sigma) bounds for all model predictions. Graphs are generated for each species supported by the model.

Species: Ca
Species: Mg
Species: Zn


FCC Lattice Constant

This bar chart plot shows the mono-atomic face-centered cubic (fcc) lattice constant predicted by the current model (shown in red) compared with the predictions for all other models in the OpenKIM Repository that support the species. The vertical bars show the average and standard deviation (one sigma) bounds for all model predictions. Graphs are generated for each species supported by the model.

Species: Mg
Species: Zn
Species: Ca


FCC Stacking Fault Energies

This bar chart plot shows the intrinsic and extrinsic stacking fault energies as well as the unstable stacking and unstable twinning energies for face-centered cubic (fcc) predicted by the current model (shown in blue) compared with the predictions for all other models in the OpenKIM Repository that support the species. The vertical bars show the average and standard deviation (one sigma) bounds for all model predictions. Graphs are generated for each species supported by the model.

Species: Ca


FCC Surface Energies

This bar chart plot shows the mono-atomic face-centered cubic (fcc) relaxed surface energies predicted by the current model (shown in blue) compared with the predictions for all other models in the OpenKIM Repository that support the species. The vertical bars show the average and standard deviation (one sigma) bounds for all model predictions. Graphs are generated for each species supported by the model.

Species: Ca


SC Lattice Constant

This bar chart plot shows the mono-atomic simple cubic (sc) lattice constant predicted by the current model (shown in the unique color) compared with the predictions for all other models in the OpenKIM Repository that support the species. The vertical bars show the average and standard deviation (one sigma) bounds for all model predictions. Graphs are generated for each species supported by the model.

Species: Ca
Species: Mg
Species: Zn


Cubic Crystal Basic Properties Table

Species: Ca

Species: Mg

Species: Zn





Cohesive energy versus lattice constant curve for monoatomic cubic lattices v003

Creators:
Contributor: karls
Publication Year: 2019
DOI: https://doi.org/10.25950/64cb38c5

This Test Driver uses LAMMPS to compute the cohesive energy of a given monoatomic cubic lattice (fcc, bcc, sc, or diamond) at a variety of lattice spacings. The lattice spacings range from a_min (=a_min_frac*a_0) to a_max (=a_max_frac*a_0) where a_0, a_min_frac, and a_max_frac are read from stdin (a_0 is typically approximately equal to the equilibrium lattice constant). The precise scaling and number of lattice spacings sampled between a_min and a_0 (a_0 and a_max) is specified by two additional parameters passed from stdin: N_lower and samplespacing_lower (N_upper and samplespacing_upper). Please see README.txt for further details.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Cohesive energy versus lattice constant curve for bcc Ca v004 view 8982
Cohesive energy versus lattice constant curve for bcc Mg v004 view 8982
Cohesive energy versus lattice constant curve for bcc Zn v004 view 8802
Cohesive energy versus lattice constant curve for diamond Ca v004 view 8365
Cohesive energy versus lattice constant curve for diamond Mg v004 view 8365
Cohesive energy versus lattice constant curve for diamond Zn v004 view 9350
Cohesive energy versus lattice constant curve for fcc Ca v004 view 9129
Cohesive energy versus lattice constant curve for fcc Mg v004 view 8772
Cohesive energy versus lattice constant curve for fcc Zn v004 view 7708
Cohesive energy versus lattice constant curve for sc Ca v004 view 8176
Cohesive energy versus lattice constant curve for sc Mg v004 view 8673
Cohesive energy versus lattice constant curve for sc Zn v004 view 8335


Elastic constants for cubic crystals at zero temperature and pressure v006

Creators: Junhao Li and Ellad Tadmor
Contributor: tadmor
Publication Year: 2019
DOI: https://doi.org/10.25950/5853fb8f

Computes the cubic elastic constants for some common crystal types (fcc, bcc, sc, diamond) by calculating the hessian of the energy density with respect to strain. An estimate of the error associated with the numerical differentiation performed is reported.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Elastic constants for bcc Ca at zero temperature v006 view 48407
Elastic constants for bcc Mg at zero temperature v006 view 25531
Elastic constants for bcc Zn at zero temperature v006 view 24925
Elastic constants for diamond Ca at zero temperature v001 view 31608
Elastic constants for diamond Mg at zero temperature v001 view 102627
Elastic constants for diamond Zn at zero temperature v001 view 49879
Elastic constants for fcc Ca at zero temperature v006 view 24945
Elastic constants for fcc Mg at zero temperature v006 view 40669
Elastic constants for fcc Zn at zero temperature v006 view 31878
Elastic constants for sc Ca at zero temperature v006 view 23662
Elastic constants for sc Mg at zero temperature v006 view 42037
Elastic constants for sc Zn at zero temperature v006 view 24358


Equilibrium structure and energy for a crystal structure at zero temperature and pressure v001

Creators:
Contributor: ilia
Publication Year: 2023
DOI: https://doi.org/10.25950/e8a7ed84

Computes the equilibrium crystal structure and energy for an arbitrary crystal at zero temperature and applied stress by performing symmetry-constrained relaxation. The crystal structure is specified using the AFLOW prototype designation. Multiple sets of free parameters corresponding to the crystal prototype may be specified as initial guesses for structure optimization. No guarantee is made regarding the stability of computed equilibria, nor that any are the ground state.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Equilibrium crystal structure and energy for MgZn in AFLOW crystal prototype A2B11_cP39_200_f_begik v001 view 175438
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype A3B_oC16_63_cf_c v001 view 84226
Equilibrium crystal structure and energy for CaMgZn in AFLOW crystal prototype A4B13C29_hP92_194_ah_c2k_fhi2jk v000 view 505699
Equilibrium crystal structure and energy for MgZn in AFLOW crystal prototype A4B7_mC110_12_10i_ae8i4j v001 view 1773960
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype A5B3_tI32_140_cl_ah v001 view 112713
Equilibrium crystal structure and energy for Ca in AFLOW crystal prototype A_cF4_225_a v001 view 84001
Equilibrium crystal structure and energy for Mg in AFLOW crystal prototype A_cF4_225_a v001 view 72663
Equilibrium crystal structure and energy for Ca in AFLOW crystal prototype A_cI2_229_a v001 view 69719
Equilibrium crystal structure and energy for Mg in AFLOW crystal prototype A_cI2_229_a v001 view 82308
Equilibrium crystal structure and energy for Ca in AFLOW crystal prototype A_cP1_221_a v001 view 76639
Equilibrium crystal structure and energy for Ca in AFLOW crystal prototype A_hP1_191_a v001 view 71927
Equilibrium crystal structure and energy for Ca in AFLOW crystal prototype A_hP2_194_c v001 view 76050
Equilibrium crystal structure and energy for Mg in AFLOW crystal prototype A_hP2_194_c v001 view 47853
Equilibrium crystal structure and energy for Zn in AFLOW crystal prototype A_hP2_194_c v001 view 51166
Equilibrium crystal structure and energy for Ca in AFLOW crystal prototype A_tI8_140_h v001 view 71706
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype AB11_tI48_141_b_aci v001 view 217254
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype AB13_cF112_226_a_bi v001 view 2145375
Equilibrium crystal structure and energy for CaMg in AFLOW crystal prototype AB2_hP12_194_f_ah v001 view 81940
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype AB2_hP12_194_f_ah v001 view 84075
Equilibrium crystal structure and energy for MgZn in AFLOW crystal prototype AB2_hP12_194_f_ah v001 view 49178
Equilibrium crystal structure and energy for MgZn in AFLOW crystal prototype AB2_oC12_63_c_ac v001 view 54700
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype AB2_oI12_74_e_h v001 view 89523
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype AB5_hP6_191_a_cg v001 view 66479
Equilibrium crystal structure and energy for MgZn in AFLOW crystal prototype AB5_mC48_12_2i_ac5i2j v001 view 243684
Equilibrium crystal structure and energy for CaZn in AFLOW crystal prototype AB_oC8_63_c_c v001 view 87167


Equilibrium lattice constant and cohesive energy of a cubic lattice at zero temperature and pressure v007

Creators: Daniel S. Karls and Junhao Li
Contributor: karls
Publication Year: 2019
DOI: https://doi.org/10.25950/2765e3bf

Equilibrium lattice constant and cohesive energy of a cubic lattice at zero temperature and pressure.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Equilibrium zero-temperature lattice constant for bcc Ca v007 view 18332
Equilibrium zero-temperature lattice constant for bcc Mg v007 view 12801
Equilibrium zero-temperature lattice constant for bcc Zn v007 view 12810
Equilibrium zero-temperature lattice constant for diamond Ca v007 view 13089
Equilibrium zero-temperature lattice constant for diamond Mg v007 view 16132
Equilibrium zero-temperature lattice constant for diamond Zn v007 view 14577
Equilibrium zero-temperature lattice constant for fcc Ca v007 view 13248
Equilibrium zero-temperature lattice constant for fcc Mg v007 view 13914
Equilibrium zero-temperature lattice constant for fcc Zn v007 view 13149
Equilibrium zero-temperature lattice constant for sc Ca v007 view 12147
Equilibrium zero-temperature lattice constant for sc Mg v007 view 12631
Equilibrium zero-temperature lattice constant for sc Zn v007 view 18405


Equilibrium lattice constants for hexagonal bulk structures at zero temperature and pressure v005

Creators: Daniel S. Karls and Junhao Li
Contributor: karls
Publication Year: 2019
DOI: https://doi.org/10.25950/c339ca32

Calculates lattice constant of hexagonal bulk structures at zero temperature and pressure by using simplex minimization to minimize the potential energy.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Equilibrium lattice constants for hcp Mg v005 view 257999
Equilibrium lattice constants for hcp Zn v005 view 257134


Linear thermal expansion coefficient of cubic crystal structures v001

Creators: Mingjian Wen
Contributor: mjwen
Publication Year: 2019
DOI: https://doi.org/10.25950/fc69d82d

This Test Driver uses LAMMPS to compute the linear thermal expansion coefficient at a finite temperature under a given pressure for a cubic lattice (fcc, bcc, sc, diamond) of a single given species.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Linear thermal expansion coefficient of fcc Ca at 293.15 K under a pressure of 0 MPa v001 view 31102783


Phonon dispersion relations for an fcc lattice v004

Creators: Matt Bierbaum
Contributor: mattbierbaum
Publication Year: 2019
DOI: https://doi.org/10.25950/64f4999b

Calculates the phonon dispersion relations for fcc lattices and records the results as curves.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Phonon dispersion relations for fcc Ca v004 view 119192


Stacking and twinning fault energies of an fcc lattice at zero temperature and pressure v002

Creators:
Contributor: SubrahmanyamPattamatta
Publication Year: 2019
DOI: https://doi.org/10.25950/b4cfaf9a

Intrinsic and extrinsic stacking fault energies, unstable stacking fault energy, unstable twinning energy, stacking fault energy as a function of fractional displacement, and gamma surface for a monoatomic FCC lattice at zero temperature and pressure.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Stacking and twinning fault energies for fcc Ca v002 view 43330965


High-symmetry surface energies in cubic lattices and broken bond model v004

Creators: Matt Bierbaum
Contributor: mattbierbaum
Publication Year: 2019
DOI: https://doi.org/10.25950/6c43a4e6

Calculates the surface energy of several high symmetry surfaces and produces a broken-bond model fit. In latex form, the fit equations are given by:

E_{FCC} (\vec{n}) = p_1 (4 \left( |x+y| + |x-y| + |x+z| + |x-z| + |z+y| +|z-y|\right)) + p_2 (8 \left( |x| + |y| + |z|\right)) + p_3 (2 ( |x+ 2y + z| + |x+2y-z| + |x-2y + z| + |x-2y-z| + |2x+y+z| + |2x+y-z| +|2x-y+z| +|2x-y-z| +|x+y+2z| +|x+y-2z| +|x-y+2z| +|x-y-2z| ) + c

E_{BCC} (\vec{n}) = p_1 (6 \left( | x+y+z| + |x+y-z| + |-x+y-z| + |x-y+z| \right)) + p_2 (8 \left( |x| + |y| + |z|\right)) + p_3 (4 \left( |x+y| + |x-y| + |x+z| + |x-z| + |z+y| +|z-y|\right)) +c.

In Python, these two fits take the following form:

def BrokenBondFCC(params, index):

import numpy
x, y, z = index
x = x / numpy.sqrt(x**2.+y**2.+z**2.)
y = y / numpy.sqrt(x**2.+y**2.+z**2.)
z = z / numpy.sqrt(x**2.+y**2.+z**2.)

return params[0]*4* (abs(x+y) + abs(x-y) + abs(x+z) + abs(x-z) + abs(z+y) + abs(z-y)) + params[1]*8*(abs(x) + abs(y) + abs(z)) + params[2]*(abs(x+2*y+z) + abs(x+2*y-z) +abs(x-2*y+z) +abs(x-2*y-z) + abs(2*x+y+z) +abs(2*x+y-z) +abs(2*x-y+z) +abs(2*x-y-z) + abs(x+y+2*z) +abs(x+y-2*z) +abs(x-y+2*z) +abs(x-y-2*z))+params[3]

def BrokenBondBCC(params, x, y, z):


import numpy
x, y, z = index
x = x / numpy.sqrt(x**2.+y**2.+z**2.)
y = y / numpy.sqrt(x**2.+y**2.+z**2.)
z = z / numpy.sqrt(x**2.+y**2.+z**2.)

return params[0]*6*(abs(x+y+z) + abs(x-y-z) + abs(x-y+z) + abs(x+y-z)) + params[1]*8*(abs(x) + abs(y) + abs(z)) + params[2]*4* (abs(x+y) + abs(x-y) + abs(x+z) + abs(x-z) + abs(z+y) + abs(z-y)) + params[3]
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Broken-bond fit of high-symmetry surface energies in fcc Ca v004 view 93980


Monovacancy formation energy and relaxation volume for cubic and hcp monoatomic crystals v001

Creators:
Contributor: efuem
Publication Year: 2023
DOI: https://doi.org/10.25950/fca89cea

Computes the monovacancy formation energy and relaxation volume for cubic and hcp monoatomic crystals.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Monovacancy formation energy and relaxation volume for fcc Ca view 429428
Monovacancy formation energy and relaxation volume for hcp Mg view 825212
Monovacancy formation energy and relaxation volume for hcp Zn view 769408


Vacancy formation and migration energies for cubic and hcp monoatomic crystals v001

Creators:
Contributor: efuem
Publication Year: 2023
DOI: https://doi.org/10.25950/c27ba3cd

Computes the monovacancy formation and migration energies for cubic and hcp monoatomic crystals.
Test Test Results Link to Test Results page Benchmark time
Usertime multiplied by the Whetstone Benchmark. This number can be used (approximately) to compare the performance of different models independently of the architecture on which the test was run.

Measured in Millions of Whetstone Instructions (MWI)
Vacancy formation and migration energy for fcc Ca view 4618950
Vacancy formation and migration energy for hcp Mg view 870783
Vacancy formation and migration energy for hcp Zn view 4495930





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