Li2MnCuO4

High-Entropy Materials HEA

MP-ID: mp-755371 · Space group: I-4m2 (#119)

Materials Project API

Basic Information

Formula

Li2MnCuO4

MP-ID

mp-755371

Elements

Sites

Density

4.5222

g/cm³

Volume

72.10

Å³

Cell a

5.0982

Cell b

5.0982

Cell c

5.0982

α Angle

131.82

β Angle

131.82

γ Angle

70.51

Space Group

I-4m2

Point Group

-42m

Crystal System

Tetragonal

Bravais Lattice

Stability

Packing Fraction

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å

Diffraction Peaks (Top 24)

2θ	d (Å)	I	hkl
21.34	4.1631	2.3	(1,1,-1)
23.90	3.7226	100.0	(1,0,-1)
23.90	3.7226	100.0	(0,1,-1)
23.90	3.7226	100.0	(0,1,0)
23.90	3.7226	100.0	(1,0,0)
30.37	2.9428	1.2	(1,-1,0)
30.37	2.9428	1.2	(0,0,1)
37.42	2.4031	20.4	(1,1,-2)
37.42	2.4030	40.8	(2,0,-1)
37.42	2.4030	20.4	(1,1,0)
39.01	2.3091	15.9	(2,1,-2)
39.01	2.3091	15.9	(1,2,-2)
39.01	2.3090	15.9	(1,2,-1)
39.01	2.3090	15.9	(2,1,-1)
43.48	2.0816	93.9	(2,2,-2)
43.49	2.0809	99.9	(1,-1,-1)
43.49	2.0809	99.9	(1,-1,1)
50.23	1.8164	12.0	(2,-1,-1)
50.23	1.8164	12.0	(1,-2,1)
50.23	1.8164	12.0	(1,-2,0)
50.23	1.8164	12.0	(2,-1,0)
50.23	1.8164	12.0	(1,0,-2)
50.23	1.8164	12.0	(0,1,-2)
50.23	1.8163	12.0	(0,1,1)

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Energy Properties

Formation Energy/atom

-1.79967

eV/atom

Energy/atom

-6.40853

eV/atom

Energy above Hull

0.0711

eV/atom

Uncorrected Energy

-5.8565

eV/atom

Volume/atom

9.01

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

3.7183

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.051570

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

O · 0.500

Element Family

Metalloid-Nonmetal

Solute Fraction

0.500

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.2130

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

10.0849

J/mol·K

Ω Parameter

1.2466

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

40.857%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

1.0800

smaller = more stable mixing

VEC

4.500

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-4.049

kJ/mol; negative = exothermic mixing

Entropy Norm

0.8750

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (2)

aaabzjvg aaacuvjb

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-755371

Reference Citation

The crystal structure and related material properties of Li2MnCuO4 were obtained from the Materials Project database (MP-ID: mp-755371, database version v2026.04.13).

Literature Citation

Horton, M.K., Huck, P., Yang, R.X. et al. Accelerated data-driven materials science with the Materials Project. Nat. Mater. 24, 1522–1532 (2025). https://doi.org/10.1038/s41563-025-02272-0

3D Crystal Structure Rendering

Loading 3D structure…

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Raw CIF Data

# generated using pymatgen
data_Li2MnCuO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.09818725
_cell_length_b   5.09818649
_cell_length_c   5.09820539
_cell_angle_alpha   131.82185787
_cell_angle_beta   131.82195143
_cell_angle_gamma   70.51086959
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2MnCuO4
_chemical_formula_sum   'Li2 Mn1 Cu1 O4'
_cell_volume   72.10468199
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Li  Li0  1  0.25000000  0.75000000  0.50000000  1.0
  Li  Li1  1  0.50000000  0.50000000  0.00000000  1.0
  Mn  Mn2  1  0.00000000  0.99999900  0.00000000  1.0
  Cu  Cu3  1  0.75000000  0.25000100  0.50000000  1.0
  O  O4  1  0.51661100  0.01661000  0.49999900  1.0
  O  O5  1  0.23113900  0.23113900  0.00000000  1.0
  O  O6  1  0.98339000  0.48338900  0.50000100  1.0
  O  O7  1  0.76886100  0.76886100  0.00000000  1.0

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