Material:

Co3Ge2

ID:

MMD-1365

Explore database:

Compounds with the same formula: Co3Ge2 (1 entry found)
Compounds with the same elements: Co-Ge (27 entries found)
Navigation:
Space group | Lattice parameters | Thermodynamic properties | Phase diagram | Magnetic properties | Atomic positions and site-specific magnetic data | Pair-wise magnetic data | Methods | References

Space group:

Crystal system

hexagonal

Space group number

187

Hermann-Mauguin

P-6m2

Hall

P -6 2

Point group

-6m2

Structure data:

Normalized formula

Co3Ge2

The number of formula units per unit cell

1

The total number of atoms per unit cell

5

The number of inequivalent sites per unit cell

4

Structure search

MP

Lattice parameters:

a (Å)

3.9301

b (Å)

3.9301

c (Å)

4.8715

α (deg.)

90.000

β (deg.)

90.000

γ (deg.)

120.000

Volume (Å3)

65.163

Density (g/cm3)

8.208

Crystal structure visualization:

Thermodynamic properties:

DFT calculations (details)

Formation energy (vs. elemental phases)

-94.7 meV/atom

Formation energy above hull

66.3 meV/atom

Phase diagram:

Phase diagram

Related structures:

Compounds with the same formula: Co3Ge2

1 entry found

Compounds with the same elements: Co-Ge

27 entries found

Magnetic properties:

DFT calculations (details)

Magnetic ordering

Ferromagnetic

Total magnetic moment

2.17 μB/cell

Averaged magnetic moment

0.43 μB/atom

Magnetic polarization, Js = μ0Ms

0.39 T (= 310.4 emu/cm3)
LMTO-GF calculations (details)

Curie temperature, TC

DFT calculations (details)

Magnetic anisotropy constant, Ka-c

-1.13 MJ/m3 (= -0.46 meV/cell)

Magnetic easy axis

ab plane

Magnetic hardness parameter, κ

3.09

Atomic positions (fractional coordinates) and site-specific magnetic data:

index species w x y z m (μB) Esoc100 (meV) Esoc001 (meV)
1 Co 2i 0.000000 0.000000 0.241852 0.92 . .
2 Co 2i 0.000000 0.000000 0.758148 0.92 . .
3 Co 1b 0.333333 0.666667 0.500000 0.48 . .
4 Ge 1a 0.333333 0.666667 0.000000 -0.02 . .
5 Ge 1d 0.666667 0.333333 0.500000 -0.02 . .
w: site multiplicity (the number of equivalent positions) and Wyckoff letter (a label for site symmetry)
m: local magnetic moment
Esoc100 (001): Spin-orbit coupling energy for the magnetization oriented along the crystallographic a (c) axis
(Individual Esoc values are temporarily not available while we perform maintenance.)
Terms and conditions

Site-resolved magnetic moments:

Local magnetic moments

Pair-wise magnetic data:

site i site j distance (Å) Jij (meV)
1 Co 2i 2 Co 2i 2.36 .
1 Co 2i 3 Co 1b 2.59 .
1 Co 2i 4 Ge 1a 2.56 .
1 Co 2i 5 Ge 1d 2.59 .
2 Co 2i 3 Co 1b 2.59 .
2 Co 2i 4 Ge 1a 2.56 .
2 Co 2i 5 Ge 1d 2.59 .
3 Co 1b 4 Ge 1a 2.44 .
3 Co 1b 5 Ge 1d 2.27 .
4 Ge 1a 5 Ge 1d 3.33 .
Jij: magnetic exchange parameter between site i and j (Individual Jij values are temporarily not available while we perform maintenance.)
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Terms and conditions

Pair-resolved magnetic exchange parameters:


Diagram is not available for this entry.

Individual exchange parameters:


Diagram is not available for this entry.

Methods:

DFT calculations

  • exchange-correlation energy functional: GGA-PBE
  • pseudopotential type: PAW
  • cutoff energy: 65.0 Ry
  • k-point grid: (kx, ky, kz) = (18, 18, 12) for magnetic anisotropy calculations
  • package: QE (v6.3)

LMTO-GF calculations

  • k-point grid: (kx, ky, kz) =
  • energy mesh: 41 points on an elliptical contour
  • package: Questaal (v7)

References:

References

Materials Project: mp-1226445
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