material

NpO

ID:

mp-6927

DOI:

10.17188/1284639


Tags: Neptunium(II) oxide

Material Details

Final Magnetic Moment
3.454 μB

Calculated total magnetic moment for the unit cell within the magnetic ordering provided (see below). Typically accurate to the second digit.

Magnetic Ordering
FM
Formation Energy / Atom
-2.552 eV

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

Energy Above Hull / Atom
0.157 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
14.66 g/cm3

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

Decomposes To
NpO2 + Np
Band Gap
0.000 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
Fm3m [225]
Hall
-F 4 2 3
Point Group
m3m
Crystal System
cubic

Electronic Structure

Topological data for ICSD ID 31714 from Topological Materials Database
Topological Classification
SM*
Subclassification
ESFD
Crossing Type
Point
* Semimetal
Enforced Semimetal with Fermi point Degeneracy

Band Structure and Density of States

Warning! Semi-local DFT tends to severely underestimate bandgaps. 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%)

Substrates

Reference for minimal coincident interface area (MCIA) and elastic energy:
substrate orientation:
No elastic tensor calculated for this material, so elastic energies not avaialable. Sorting by MCIA instead.
substrate material substrate orientation film orientation MCIA [Å2]
LaAlO3 (mp-2920) <0 0 1> <1 0 0> 354.0
AlN (mp-661) <0 0 1> <1 1 1> 163.5
AlN (mp-661) <1 0 0> <1 1 0> 300.4
AlN (mp-661) <1 0 1> <1 0 0> 259.6
AlN (mp-661) <1 1 1> <1 1 0> 233.6
CeO2 (mp-20194) <1 0 0> <1 0 0> 118.0
CeO2 (mp-20194) <1 1 0> <1 1 0> 133.5
CeO2 (mp-20194) <1 1 1> <1 1 1> 163.5
GaAs (mp-2534) <1 0 0> <1 0 0> 306.8
GaAs (mp-2534) <1 1 0> <1 1 0> 133.5
GaAs (mp-2534) <1 1 1> <1 1 1> 163.5
BaF2 (mp-1029) <1 0 0> <1 0 0> 188.8
BaF2 (mp-1029) <1 1 1> <1 1 1> 286.2
GaN (mp-804) <1 0 1> <1 1 1> 204.4
GaN (mp-804) <1 1 0> <1 1 0> 267.0
GaN (mp-804) <0 0 1> <1 1 0> 133.5
GaN (mp-804) <1 0 0> <1 0 0> 283.2
GaN (mp-804) <1 1 1> <1 0 0> 118.0
SiO2 (mp-6930) <0 0 1> <1 1 1> 286.2
SiO2 (mp-6930) <1 1 1> <1 0 0> 212.4
KCl (mp-23193) <1 0 0> <1 0 0> 212.4
KCl (mp-23193) <1 1 1> <1 1 1> 286.2
DyScO3 (mp-31120) <1 0 1> <1 0 0> 283.2
DyScO3 (mp-31120) <1 1 0> <1 0 0> 306.8
DyScO3 (mp-31120) <0 1 0> <1 0 0> 354.0
DyScO3 (mp-31120) <0 1 1> <1 1 0> 267.0
InAs (mp-20305) <1 0 0> <1 0 0> 188.8
ZnSe (mp-1190) <1 0 0> <1 0 0> 306.8
ZnSe (mp-1190) <1 1 0> <1 1 0> 133.5
ZnSe (mp-1190) <1 1 1> <1 1 1> 163.5
KTaO3 (mp-3614) <1 0 0> <1 0 0> 212.4
KTaO3 (mp-3614) <1 1 0> <1 1 0> 66.8
KTaO3 (mp-3614) <1 1 1> <1 0 0> 141.6
CdS (mp-672) <1 1 1> <1 0 0> 212.4
CdS (mp-672) <0 0 1> <1 0 0> 283.2
CdS (mp-672) <1 0 0> <1 0 0> 141.6
CdS (mp-672) <1 0 1> <1 0 0> 354.0
CdS (mp-672) <1 1 0> <1 1 0> 100.1
LiF (mp-1138) <1 0 0> <1 1 1> 204.4
LiF (mp-1138) <1 1 0> <1 1 0> 66.8
LiF (mp-1138) <1 1 1> <1 1 1> 122.6
Te2W (mp-22693) <0 1 1> <1 0 0> 118.0
Te2W (mp-22693) <1 1 1> <1 1 0> 233.6
Te2W (mp-22693) <0 0 1> <1 0 0> 212.4
Te2W (mp-22693) <0 1 0> <1 0 0> 212.4
YVO4 (mp-19133) <1 0 0> <1 1 0> 233.6
YVO4 (mp-19133) <0 0 1> <1 0 0> 212.4
TePb (mp-19717) <1 0 0> <1 0 0> 212.4
TePb (mp-19717) <1 1 1> <1 1 1> 286.2
Te2Mo (mp-602) <0 0 1> <1 0 0> 306.8
Up to 50 entries displayed.
minimal coincident interface area.

Elasticity

Reference for tensor and properties:
Stiffness Tensor Cij (GPa)
365 107 107 0 0 0
107 365 107 0 0 0
107 107 365 0 0 0
0 0 0 30 0 0
0 0 0 0 30 0
0 0 0 0 0 30
Compliance Tensor Sij (10-12Pa-1)
3.2 -0.7 -0.7 0 0 0
-0.7 3.2 -0.7 0 0 0
-0.7 -0.7 3.2 0 0 0
0 0 0 33.6 0 0
0 0 0 0 33.6 0
0 0 0 0 0 33.6
Shear Modulus GV
69 GPa
Bulk Modulus KV
193 GPa
Shear Modulus GR
43 GPa
Bulk Modulus KR
193 GPa
Shear Modulus GVRH
56 GPa
Bulk Modulus KVRH
193 GPa
Elastic Anisotropy
3.08
Poisson's Ratio
0.37

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
Sr4SO3 (mp-1079788) 0.0000 0.200 3
BaSr3O4 (mp-984729) 0.0000 0.044 3
ScH4Pd3 (mp-981386) 0.0000 0.039 3
Sr3CdO4 (mp-981103) 0.0000 0.019 3
SrCa3O4 (mp-978844) 0.0000 0.040 3
EuP (mp-20300) 0.0000 0.000 2
CrH (mp-24287) 0.0000 0.000 2
PtO (mp-11540) 0.0000 0.930 2
NpSb (mp-20969) 0.0000 0.000 2
LiI (mp-22899) 0.0000 0.037 2
As (mp-10) 0.0000 0.126 1
Sc (mp-1008681) 0.0000 0.719 1
Ca (mp-10683) 0.0000 0.393 1
C (mp-998866) 0.0000 2.763 1
Sb (mp-133) 0.0000 0.051 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
520 eV
# of K-points
None
U Values
--
Pseudopotentials
VASP PAW: Np O
Final Energy/Atom
-11.1487 eV
Corrected Energy
-22.9996 eV
-22.9996 eV = -22.2974 eV (uncorrected energy) - 0.7023 eV (MP Anion Correction)

Detailed input parameters and outputs for all calculations


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ICSD IDs
  • 31714
Submitted by
User remarks:
  • Neptunium(II) oxide

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)