material

Ca(CuGe)2
ID:

mp-4441
DOI:

10.17188/1208156

Tags: Calcium copper germanide (1/2/2) Calcium copper germanium (1:2:2)

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
-0.333 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
5.87 g/cm3

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

Decomposes To
Stable
Band Gap
0.000 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
I4/mmm [139]
Hall
-I 4 2
Point Group
4/mmm
Crystal System
tetragonal

Electronic Structure

Topological data for ICSD ID 25315 from Topological Materials Database
Topological Classification
SM*
Subclassification
ES†
Crossing Type
Line
* Semimetal
† Enforced Semimetal with Line or Plane 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%)

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]
SrTiO3 (mp-4651) <0 0 1> <0 0 1> 0.000 154.9
GaSb (mp-1156) <1 0 0> <0 0 1> 0.000 154.9
Fe2O3 (mp-24972) <1 0 1> <1 0 0> 0.001 298.5
PbSe (mp-2201) <1 0 0> <0 0 1> 0.001 154.9
TePb (mp-19717) <1 0 0> <0 0 1> 0.003 86.0
CdSe (mp-2691) <1 0 0> <0 0 1> 0.004 154.9
SrTiO3 (mp-4651) <1 0 1> <1 0 1> 0.013 321.9
ZrO2 (mp-2858) <0 0 1> <0 0 1> 0.013 137.6
C (mp-66) <1 1 0> <1 1 0> 0.014 180.9
Ag (mp-124) <1 0 0> <0 0 1> 0.017 17.2
SrTiO3 (mp-4651) <1 1 0> <0 0 1> 0.017 309.7
TiO2 (mp-2657) <0 0 1> <0 0 1> 0.017 86.0
LiAlO2 (mp-3427) <0 0 1> <0 0 1> 0.019 137.6
Cu (mp-30) <1 1 1> <1 1 0> 0.026 180.9
Au (mp-81) <1 1 1> <1 1 0> 0.027 60.3
Ge(Bi3O5)4 (mp-23352) <1 0 0> <1 0 0> 0.033 213.2
GdScO3 (mp-5690) <0 0 1> <1 0 1> 0.035 321.9
SiC (mp-8062) <1 0 0> <0 0 1> 0.039 154.9
Bi2Te3 (mp-34202) <0 0 1> <1 1 0> 0.043 120.6
Ag (mp-124) <1 1 1> <1 1 0> 0.047 60.3
GaTe (mp-542812) <1 0 1> <0 0 1> 0.052 292.5
Mg (mp-153) <1 0 1> <0 0 1> 0.053 206.5
LaAlO3 (mp-2920) <1 0 0> <1 0 0> 0.054 213.2
Au (mp-81) <1 0 0> <0 0 1> 0.059 17.2
Ga2O3 (mp-886) <1 0 -1> <0 0 1> 0.064 154.9
ZnTe (mp-2176) <1 0 0> <0 0 1> 0.066 154.9
Mg (mp-153) <1 1 1> <0 0 1> 0.066 275.3
C (mp-48) <0 0 1> <0 0 1> 0.073 292.5
Fe2O3 (mp-24972) <0 0 1> <1 1 0> 0.075 180.9
Ga2O3 (mp-886) <1 0 0> <1 1 1> 0.077 125.4
InAs (mp-20305) <1 0 0> <0 0 1> 0.079 154.9
TiO2 (mp-2657) <1 1 0> <0 0 1> 0.079 154.9
Te2W (mp-22693) <0 1 0> <0 0 1> 0.089 326.9
Bi2Se3 (mp-541837) <0 0 1> <0 0 1> 0.089 120.4
BN (mp-984) <1 0 0> <0 0 1> 0.089 292.5
GaN (mp-804) <1 1 1> <0 0 1> 0.090 275.3
SiC (mp-11714) <1 0 1> <0 0 1> 0.095 258.1
AlN (mp-661) <1 0 1> <1 1 1> 0.097 125.4
Mg (mp-153) <1 1 0> <1 0 1> 0.108 229.9
MgF2 (mp-1249) <1 0 0> <0 0 1> 0.109 86.0
GaN (mp-804) <1 0 0> <1 0 0> 0.112 85.3
Ge3(BiO3)4 (mp-23560) <1 0 0> <0 0 1> 0.129 223.7
TeO2 (mp-2125) <0 1 0> <1 0 1> 0.132 138.0
GaN (mp-804) <1 1 0> <1 0 1> 0.141 229.9
CaF2 (mp-2741) <1 0 0> <0 0 1> 0.144 154.9
MoSe2 (mp-1634) <1 1 1> <1 1 0> 0.148 180.9
CdS (mp-672) <1 0 0> <1 0 0> 0.150 85.3
GdScO3 (mp-5690) <1 0 1> <0 0 1> 0.155 172.1
Ag (mp-124) <1 1 0> <0 0 1> 0.160 120.4
GaN (mp-804) <0 0 1> <0 0 1> 0.162 240.9
Up to 50 entries displayed.
†minimal coincident interface area.

Elasticity

Reference for tensor and properties:
Visualize with ELATE
Stiffness Tensor Cij (GPa)
146 23 58 0 0 0
23 146 58 0 0 0
58 58 139 0 0 0
0 0 0 35 0 0
0 0 0 0 35 0
0 0 0 0 0 27
Compliance Tensor Sij (10-12Pa-1)
8.2 0.1 -3.5 0 0 0
0.1 8.2 -3.5 0 0 0
-3.5 -3.5 10.1 0 0 0
0 0 0 28.2 0 0
0 0 0 0 28.2 0
0 0 0 0 0 37.4
Shear Modulus GV
39 GPa
Bulk Modulus KV
79 GPa
Shear Modulus GR
36 GPa
Bulk Modulus KR
78 GPa
Shear Modulus GVRH
38 GPa
Bulk Modulus KVRH
78 GPa
Elastic Anisotropy
0.40
Poisson's Ratio
0.29

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
Th(GeRh)2 (mp-3011) 0.0111 0.000 3
Ce(SiRh)2 (mp-4090) 0.0252 0.000 3
Yb(CuGe)2 (mp-13401) 0.0215 0.000 3
Ce(SiIr)2 (mp-4433) 0.0235 0.005 3
Pr(CuGe)2 (mp-4924) 0.0251 0.000 3
La3Cu4(P2O)2 (mp-6309) 0.5964 0.000 4
CaGa4 (mp-1976) 0.2040 0.000 2
SrAl4 (mp-2775) 0.1768 0.000 2
SrGa4 (mp-1827) 0.1851 0.000 2
BaAl4 (mp-1903) 0.0660 0.000 2
BaIn4 (mp-22687) 0.1853 0.000 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

Elasticity

Methodology

Structure Optimization

Run Type
GGA
Energy Cutoff
520 eV
# of K-points
None
U Values
--
Pseudopotentials
VASP PAW: Ca_sv Cu_pv Ge_d
Final Energy/Atom
-4.2201 eV
Corrected Energy
-21.1004 eV
-21.1004 eV = -21.1004 eV (uncorrected energy)

Detailed input parameters and outputs for all calculations

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ICSD IDs
  • 81757
  • 25315
  • 619230
Submitted by
User remarks:
  • Calcium copper germanide (1/2/2)

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)