JARVIS-FF NIST Disclaimer

Structural formula: H2

Force-field: NiAlH_jea.eam.alloy

Space group : P6_3/mmc

JARVIS ID: JLMP-1344

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Elastic tensor (GPa)

Elastic tensor for the conventional cell of the system were calculated with LAMMPS in.elastic script at 0 K [Source] . Similar script can be used for temperature dependent elastic constants and will be available here soon. WARNING! Please note that the starting lattice parameters of crystal structures were taken from density functional theory (DFT) and not from experiments. Generic minimization parameters were chosen for LAMMPS run rather than testing them for each individual case such as energy convergence criterion and so on. Hence, there are chances that the calculation gets trapped in a local energy minima. Please read carefully the assumptions taken during calculations in the in.elastic script and use the data at your own risk

0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 -0.0 0.0 0.0
0.0 0.0 0.0 0.0 -0.0 0.0
0.0 -0.0 0.0 0.0 0.0 -0.0
0.0 0.0 -0.0 0.0 0.0 0.0
0.0 0.0 0.0 -0.0 0.0 0.0

Bv: 0.0 GPa

Gv: 0.0 GPa

Vacancy-formation energy (eV)

Vacancy formation energies were calculated by deleting the symmterically distinct atoms in the system [Source]. In the table, vacancy forming element, its multiplicity, and defect-formation energy are given. The reference element cohesive energies were calculated with the most stable structure for the element found on materials project database. Defect structures were constructed with the fully-relaxed bulk system as input. For defect-structures energetics calculations, constant volume ensemble was used. We impose the defect structures to be at least 1.5 nm large in all directions.

Element Mult. Value
H 4 4.739 Download cif file

Surface energy (J/m2)

Surface energies were calculated for symmterically distinct crystal surfaces . In the table, (hkl) indices and surface enegies are given. For surface-structure energetics, constant volume ensemble was used. We impose the slab thickness to be at least 2 nm and vaccum size of 2.5 nm. The maximum miller index is taken as 3.

Surface Value
(2 -1 3) -0.0 Download cif file
(3 -1 2) -0.0 Download cif file
(2 0 1) -0.0 Download cif file
(2 -1 2) -0.0 Download cif file
(3 -1 0) -0.0 Download cif file
(2 2 1) -0.0 Download cif file
(3 2 1) -0.0 Download cif file
(3 0 1) -0.0 Download cif file
(3 0 2) -0.0 Download cif file
(3 -1 3) -0.0 Download cif file
(0 0 1) 0.0 Download cif file
(3 -1 1) 0.0 Download cif file
(3 3 2) 0.0 Download cif file
(3 3 1) 0.0 Download cif file
(3 2 2) 0.0 Download cif file
(2 2 3) 0.0 Download cif file
(1 0 0) 0.0 Download cif file
(3 2 3) 0.0 Download cif file
(3 1 2) 0.0 Download cif file
(1 1 1) 0.0 Download cif file
(1 0 1) 0.0 Download cif file
(3 1 1) 0.0 Download cif file
(3 1 0) 0.0 Download cif file
(1 0 2) 0.0 Download cif file
(3 2 0) 0.0 Download cif file
(1 0 3) 0.0 Download cif file
(1 1 0) 0.0 Download cif file
(3 1 3) 0.99 Download cif file
(2 0 3) 1.412 Download cif file

Phonon

Phonons were obtained by making an interface of JARVIS-FF with Phonopy package at 0 K [Source] . For deformed-structures, constant volume ensemble was used. The deofrmed structures were taken of at least 1.5 nm size in all directions. The band-indices for phonon bandstructure was obtained with Pymatgen. The phonon representation were obtained with phonopy. "I" and "R" denotes infrared and Raman active modes respectively

Visualize Phonons here
Phonon mode (cm-1) Representation
-8.80813e-05 None
1.5830300321 B2g
1.816980955 E2g R
42.0481460397 E2u
42.0873853488 E1g R
4398.00731688 None
All phonon mode at Gamma point (cm-1)
-2.77873e-05
1.67489e-05
3.74249e-05
1.5830300321
1.8169809542
1.8169810499
42.0481460397
42.0481462827
42.0873853488
42.0873855878
4398.00731688
4398.00760147

See also

Links to other databases or papers are provided below

JVASP-25170

mp-24504

Energy above hull from mp (eV): 4.4408920985e-16