material

NaNbS2
ID:

mp-7937
DOI:

10.17188/1307841

Tags: Sodium niobium sulfide (.7/1/2)

Material Details

Final Magnetic Moment
0.001 μB

Calculated total magnetic moment for the unit cell within the magnetic ordering provided (see below). Typically accurate to the second digit.
Magnetic Ordering
NM
Formation Energy / Atom
-1.542 eV

Calculated formation energy from the elements normalized to per atom in the unit cell.

Energy Above Hull / Atom
0.000 eV

The energy of decomposition of this material into the set of most stable materials at this chemical composition, in eV/atom. Stability is tested against all potential chemical combinations that result in the material's composition. For example, a Co2O3 structure would be tested for decomposition against other Co2O3 structures, against Co and O2 mixtures, and against CoO and O2 mixtures.

Density
4.10 g/cm3

The calculated bulk crystalline density, typically underestimated due calculated cell volumes overestimated on average by 3% (+/- 6%)

Decomposes To
Stable
Band Gap
0.661 eV

In general, band gaps computed with common exchange-correlation functionals such as the LDA and GGA are severely underestimated. Typically the disagreement is reported to be ~50% in the literature. Some internal testing by the Materials Project supports these statements; typically, we find that band gaps are underestimated by ~40%. We additionally find that several known insulators are predicted to be metallic.

Space Group

Hermann Mauguin
P63/mmc [194]
Hall
-P 6c 2c
Point Group
6/mmm
Crystal System
hexagonal

Electronic Structure

Topological data for ICSD ID 26285 from Topological Materials Database
Topological Classification
trivial*
Subclassification
LCEBR†
* trivial insulator or metal
† Linear Combination of Elementary Band Representations

Band Structure and Density of States

Warning! Semi-local DFT tends to severely underestimate bandgaps. Please see the wiki for more info.

Vibrational Properties

Reference for phonon calculations and visualization: Visualize with phononwebsite

Phonon dispersion

Density of States
Warning! These calculations were performed using a PBEsol exchange correlation functional in the framework of DFPT using the Abinit code. Please see the wiki for more info.

X-Ray Diffraction

    Select radiation source:
  • Cu
  • Ag
  • Mo
  • Fe

Calculated powder diffraction pattern; note that peak spacings may be affected due to inaccuracies in calculated cell volume, which is typically overestimated on average by 3% (+/- 6%)

X-Ray Absorption Spectra

FEFF XANES

Select an element to display a spectrum averaged over all sites of that element in the structure.

Apply Gaussian smoothing:

0 eV
3 eV
FWHM: 0 eV

Download spectra for every symmetrically equivalent absorption site in the structure.

Download FEFF Input parameters.

Warning: These results are intended to be semi-quantitative in that corrections, such as edge shifts and Debye-Waller damping, have not been included.

Substrates

Reference for minimal coincident interface area (MCIA) and elastic energy:
substrate orientation:
substrate material substrate orientation film orientation elastic energy [meV] MCIA† [Å2]
SiC (mp-8062) <1 1 1> <0 0 1> 0.002 132.6
Mg (mp-153) <1 0 1> <1 1 0> 0.010 169.8
LiGaO2 (mp-5854) <1 1 0> <0 0 1> 0.012 193.8
BN (mp-984) <0 0 1> <0 0 1> 0.014 71.4
ZnO (mp-2133) <0 0 1> <0 0 1> 0.015 122.4
LiNbO3 (mp-3731) <0 0 1> <0 0 1> 0.033 71.4
Te2Mo (mp-602) <0 0 1> <0 0 1> 0.034 132.6
KCl (mp-23193) <1 1 1> <0 0 1> 0.037 71.4
TbScO3 (mp-31119) <0 0 1> <0 0 1> 0.052 285.6
ZnO (mp-2133) <1 0 0> <1 0 0> 0.052 245.1
Ni (mp-23) <1 1 1> <0 0 1> 0.062 193.8
CdS (mp-672) <1 0 0> <1 0 1> 0.063 200.3
Ga2O3 (mp-886) <1 0 -1> <0 0 1> 0.097 265.2
LiTaO3 (mp-3666) <0 0 1> <0 0 1> 0.100 71.4
Al2O3 (mp-1143) <1 0 1> <0 0 1> 0.115 326.4
PbS (mp-21276) <1 1 0> <1 1 0> 0.118 254.7
DyScO3 (mp-31120) <0 0 1> <0 0 1> 0.120 285.6
Ga2O3 (mp-886) <0 1 0> <0 0 1> 0.124 71.4
GaN (mp-804) <1 0 1> <1 1 0> 0.133 169.8
Cu (mp-30) <1 1 0> <1 0 0> 0.134 147.1
Ag (mp-124) <1 1 0> <0 0 1> 0.135 122.4
Au (mp-81) <1 1 1> <0 0 1> 0.136 30.6
AlN (mp-661) <1 1 1> <0 0 1> 0.137 173.4
AlN (mp-661) <1 0 0> <0 0 1> 0.145 255.0
InSb (mp-20012) <1 0 0> <0 0 1> 0.149 357.1
AlN (mp-661) <1 1 0> <0 0 1> 0.149 275.4
Ge3(BiO3)4 (mp-23560) <1 1 1> <0 0 1> 0.150 193.8
Au (mp-81) <1 1 0> <0 0 1> 0.152 122.4
KTaO3 (mp-3614) <1 1 1> <0 0 1> 0.155 193.8
Te2Mo (mp-602) <1 0 1> <0 0 1> 0.156 275.4
Ga2O3 (mp-886) <1 0 0> <0 0 1> 0.158 163.2
InP (mp-20351) <1 0 0> <0 0 1> 0.158 244.8
BN (mp-984) <1 1 1> <0 0 1> 0.162 275.4
CdTe (mp-406) <1 0 0> <0 0 1> 0.170 357.1
NdGaO3 (mp-3196) <0 0 1> <1 0 0> 0.173 245.1
TiO2 (mp-390) <1 0 0> <0 0 1> 0.175 183.6
MoSe2 (mp-1634) <0 0 1> <0 0 1> 0.187 122.4
WSe2 (mp-1821) <0 0 1> <0 0 1> 0.189 122.4
TiO2 (mp-2657) <1 0 0> <0 0 1> 0.189 112.2
NdGaO3 (mp-3196) <1 0 0> <0 0 1> 0.198 357.1
GaN (mp-804) <1 0 0> <0 0 1> 0.201 285.6
CdWO4 (mp-19387) <0 1 0> <0 0 1> 0.204 316.2
LiNbO3 (mp-3731) <1 0 0> <1 0 0> 0.218 147.1
LiNbO3 (mp-3731) <1 1 0> <1 1 0> 0.219 254.7
SiC (mp-7631) <1 0 1> <0 0 1> 0.229 193.8
KCl (mp-23193) <1 1 0> <0 0 1> 0.231 285.6
Ag (mp-124) <1 1 1> <0 0 1> 0.241 30.6
Al (mp-134) <1 1 1> <0 0 1> 0.243 193.8
TiO2 (mp-390) <1 1 1> <0 0 1> 0.263 214.2
SrTiO3 (mp-4651) <1 0 1> <0 0 1> 0.273 316.2
Up to 50 entries displayed.
†minimal coincident interface area.

Elasticity

Reference for tensor and properties:
Visualize with ELATE
Stiffness Tensor Cij (GPa)
159 47 34 0 0 0
47 159 34 0 0 0
34 34 135 0 0 0
0 0 0 38 0 0
0 0 0 0 38 0
0 0 0 0 0 56
Compliance Tensor Sij (10-12Pa-1)
7.1 -1.8 -1.4 0 0 0
-1.8 7.1 -1.4 0 0 0
-1.4 -1.4 8.1 0 0 0
0 0 0 26.2 0 0
0 0 0 0 26.2 0
0 0 0 0 0 17.9
Shear Modulus GV
49 GPa
Bulk Modulus KV
76 GPa
Shear Modulus GR
47 GPa
Bulk Modulus KR
75 GPa
Shear Modulus GVRH
48 GPa
Bulk Modulus KVRH
75 GPa
Elastic Anisotropy
0.20
Poisson's Ratio
0.24

Dielectric Properties

Reference for tensor and properties: Methodology
Dielectric Tensor εij∞ (electronic contribution)
13.72 -0.00 0.00
-0.00 13.72 0.00
0.00 0.00 5.79
Dielectric Tensor εij (total)
15.20 -0.00 0.00
-0.00 15.20 0.00
0.00 0.00 8.27
Polycrystalline dielectric constant εpoly∞
(electronic contribution)
11.07
Polycrystalline dielectric constant εpoly
(total)
12.89
Refractive Index n
3.33
Potentially ferroelectric?
Unknown

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
RbLaO2 (mp-7972) 0.6528 0.000 3
NaNbO2 (mp-3744) 0.4632 0.000 3
NaNbSe2 (mp-7939) 0.0678 0.000 3
SmTlO2 (mp-754933) 0.6597 0.099 3
Ca3SiBr2 (mp-567974) 0.4622 0.276 3
MoN (mp-1078389) 0.5668 0.010 2
TcB (mp-999120) 0.6481 0.163 2
Hf2S (mp-10000) 0.6528 0.000 2
NiBi (mp-22861) 0.6480 0.303 2
VS (mp-849052) 0.6369 0.412 2
N2 (mp-1061298) 0.7367 0.000 1
Up to 5 similar elemental, binary, ternary, quaternary, etc. structures displayed (dissimilarity threshold 0.75). Ehull: energy above hull per atom [eV].

Calculation Summary

Elasticity

Methodology

Structure Optimization

Run Type
GGA
Energy Cutoff
700 eV
# of K-points
None
U Values
--
Pseudopotentials
VASP PAW: Na_pv Nb_pv S
Final Energy/Atom
-6.1316 eV
Corrected Energy
-51.0648 eV
Uncorrected energy = -49.0528 eV Composition-based energy adjustment (-0.503 eV/atom x 4.0 atoms) = -2.0120 eV Corrected energy = -51.0648 eV

Detailed input parameters and outputs for all calculations

Show JSON History Show BibTex Citation Download BibTex Citation
ICSD IDs
  • 26285
Submitted by
User remarks:
  • Sodium niobium sulfide (.7/1/2)

Displaying lattice parameters for primitive cell; note that calculated cell volumes are typically overestimated on average by 3% (+/- 6%). Note the primitive cell may appear less symmetric than the conventional cell representation (see "Structure Type" selector below the 3d structure)