material

Np3Si2
ID:

mp-1079895
Tags: U3Si2 Neptunium silicide (3/2) Np3Si2

Material Details

Final Magnetic Moment
0.186 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
0.275 eV

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

Energy Above Hull / Atom
0.438 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
13.37 g/cm3

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

Decomposes To
NpSi2 + 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
P4/mbm [127]
Hall
-P 4 2ab
Point Group
4/mmm
Crystal System
tetragonal

Electronic Structure

Topological data for ICSD ID 647220 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%)

Elasticity

A full elastic tensor has not been calculated for this material. Registered users can view statistical-learning-based predictions of this material's bulk and shear moduli.

Once you have registered you can also "vote" for full calculation of this material's elastic properties.

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
Yb2InCu2 (mp-21500) 0.2642 0.008 3
Mn(BW)2 (mp-19789) 0.2240 0.000 3
Fe(BMo)2 (mp-1078299) 0.2498 0.031 3
Ta2CrB2 (mp-1080757) 0.2129 0.000 3
Mn(BMo)2 (mp-1092278) 0.2233 0.009 3
Th3Si2 (mp-1079146) 0.2288 0.000 2
Th3Ga2 (mp-30670) 0.2760 0.021 2
U3Si2 (mp-21346) 0.0803 0.151 2
Pu3Si2 (mp-1080146) 0.1733 0.000 2
Ce3Si2 (mp-1079007) 0.1801 0.001 2
Up to 5 similar elemental, binary, ternary, quaternary, etc. structures displayed (dissimilarity threshold 0.75). Ehull: energy above hull per atom [eV].

Calculation Summary

Structure Optimization

Run Type
GGA
Energy Cutoff
520 eV
# of K-points
None
U Values
--
Pseudopotentials
VASP PAW: Np Si
Final Energy/Atom
-9.6633 eV
Corrected Energy
-96.3488 eV
Uncorrected energy = -96.6328 eV Composition-based energy adjustment (0.071 eV/atom x 4.0 atoms) = 0.2840 eV Corrected energy = -96.3488 eV

Detailed input parameters and outputs for all calculations

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ICSD IDs
  • 647220
Submitted by
User remarks:
  • Neptunium silicide (3/2)

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)