material

SrGe2
ID:

mp-7390
DOI:

10.17188/1287916

Tags: Strontium germanium (1:2) - high-pressure phase

Material Details

Final Magnetic Moment
0.000 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
-0.430 eV

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

Energy Above Hull / Atom
0.056 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
4.94 g/cm3

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

Decomposes To
SrGe2
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
P3m1 [164]
Hall
-P 3 2"
Point Group
3m
Crystal System
trigonal

Electronic Structure

Topological data for ICSD ID 10000 from Topological Materials Database
Topological Classification
TI*
Subclassification
SEBR†
* Topological insulator
† Split 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.

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]
AlN (mp-661) <0 0 1> <0 0 1> 60.2
AlN (mp-661) <1 0 0> <1 0 0> 173.4
AlN (mp-661) <1 0 1> <1 1 1> 121.4
AlN (mp-661) <1 1 0> <1 0 0> 281.8
AlN (mp-661) <1 1 1> <0 0 1> 225.9
CeO2 (mp-20194) <1 0 0> <1 0 1> 343.2
CeO2 (mp-20194) <1 1 0> <0 0 1> 301.2
CeO2 (mp-20194) <1 1 1> <0 0 1> 195.8
GaAs (mp-2534) <1 0 0> <1 0 1> 158.4
GaAs (mp-2534) <1 1 0> <0 0 1> 240.9
GaAs (mp-2534) <1 1 1> <0 0 1> 60.2
BaF2 (mp-1029) <1 0 0> <1 0 1> 79.2
BaF2 (mp-1029) <1 1 0> <0 0 1> 225.9
BaF2 (mp-1029) <1 1 1> <0 0 1> 195.8
LaAlO3 (mp-2920) <0 0 1> <0 0 1> 105.4
LaAlO3 (mp-2920) <1 0 1> <0 0 1> 240.9
GaN (mp-804) <0 0 1> <0 0 1> 60.2
GaN (mp-804) <1 0 0> <1 0 0> 65.0
GaN (mp-804) <1 0 1> <1 0 0> 195.1
GaN (mp-804) <1 1 0> <1 0 0> 86.7
GaN (mp-804) <1 1 1> <1 1 1> 121.4
SiO2 (mp-6930) <0 0 1> <0 0 1> 195.8
SiO2 (mp-6930) <1 0 0> <1 0 0> 281.8
SiO2 (mp-6930) <1 0 1> <1 1 1> 323.7
SiO2 (mp-6930) <1 1 0> <1 1 1> 283.2
SiO2 (mp-6930) <1 1 1> <0 0 1> 271.1
KCl (mp-23193) <1 0 0> <1 0 1> 79.2
KCl (mp-23193) <1 1 0> <0 0 1> 225.9
KCl (mp-23193) <1 1 1> <0 0 1> 286.1
DyScO3 (mp-31120) <0 0 1> <1 1 1> 121.4
DyScO3 (mp-31120) <0 1 0> <0 0 1> 301.2
DyScO3 (mp-31120) <0 1 1> <1 0 0> 260.2
DyScO3 (mp-31120) <1 0 0> <1 1 1> 323.7
DyScO3 (mp-31120) <1 1 0> <0 0 1> 316.2
InAs (mp-20305) <1 0 0> <1 0 1> 79.2
InAs (mp-20305) <1 1 0> <0 0 1> 225.9
InAs (mp-20305) <1 1 1> <0 0 1> 195.8
ZnSe (mp-1190) <1 0 0> <1 0 1> 158.4
ZnSe (mp-1190) <1 1 0> <0 0 1> 240.9
ZnSe (mp-1190) <1 1 1> <0 0 1> 60.2
KTaO3 (mp-3614) <1 0 0> <1 0 1> 79.2
KTaO3 (mp-3614) <1 1 0> <1 1 1> 161.8
KTaO3 (mp-3614) <1 1 1> <0 0 1> 195.8
CdS (mp-672) <1 0 0> <1 0 0> 86.7
CdS (mp-672) <1 0 1> <1 0 0> 65.0
CdS (mp-672) <1 1 0> <1 1 0> 150.2
CdS (mp-672) <1 1 1> <0 0 1> 256.0
LiF (mp-1138) <1 1 0> <0 0 1> 120.5
CdS (mp-672) <0 0 1> <0 0 1> 15.1
LiF (mp-1138) <1 0 0> <1 0 1> 79.2
Up to 50 entries displayed.
†minimal coincident interface area.

Elasticity

Reference for tensor and properties:
Visualize with ELATE
Stiffness Tensor Cij (GPa)
59 8 16 -15 0 0
8 59 16 15 0 0
16 16 46 0 0 0
-15 15 0 25 0 0
0 0 0 0 25 -15
0 0 0 0 -15 26
Compliance Tensor Sij (10-12Pa-1)
24.1 -6.1 -6.1 18.2 0 0
-6.1 24.1 -6.1 -18.2 0 0
-6.1 -6.1 25.9 0 0 0
18.2 -18.2 0 62.3 0 0
0 0 0 0 62.3 36.4
0 0 0 0 36.4 60.4
Shear Modulus GV
23 GPa
Bulk Modulus KV
27 GPa
Shear Modulus GR
16 GPa
Bulk Modulus KR
27 GPa
Shear Modulus GVRH
20 GPa
Bulk Modulus KVRH
27 GPa
Elastic Anisotropy
2.19
Poisson's Ratio
0.20

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
Sr(SnAs)2 (mp-9379) 0.4569 0.000 3
Na(SnAs)2 (mp-9378) 0.4108 0.000 3
KLaO2 (mp-7958) 0.5195 0.000 3
Bi2Te5Pb2 (mp-569044) 0.5437 0.055 3
NaRhO2 (mp-8830) 0.5263 0.000 3
Na3Ni2SbO6 (mp-971678) 0.6556 0.000 4
Li2VO2F (mp-763844) 0.6658 0.131 4
Li3Ti2CuO6 (mp-774874) 0.6449 0.107 4
Na2Li(NiO2)3 (mp-773956) 0.6276 0.031 4
Na3Co2SbO6 (mp-19087) 0.6695 0.000 4
EuGe2 (mp-22116) 0.1315 0.019 2
EuGe2 (mp-991101) 0.2197 0.019 2
BaSn2 (mp-567510) 0.2142 0.000 2
CaGe2 (mp-1009654) 0.2380 0.018 2
MgSi2 (mp-1073325) 0.2386 0.154 2
Na6MnNi3(SbO6)2 (mp-1094109) 0.6758 0.139 5
Bi (mp-23152) 0.5830 0.000 1
As (mp-11) 0.5933 0.000 1
Te (mp-570459) 0.6883 0.044 1
Sb (mp-104) 0.5616 0.000 1
P (mp-130) 0.5468 0.086 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: Sr_sv Ge_d
Final Energy/Atom
-4.0712 eV
Corrected Energy
-12.2135 eV
Uncorrected energy = -12.2135 eV Corrected energy = -12.2135 eV

Detailed input parameters and outputs for all calculations

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ICSD IDs
  • 10000
Submitted by
User remarks:
  • Strontium germanium (1:2) - high-pressure phase

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)