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Li6FeNi9O20

High-Entropy Materials HEA

MP-ID: mp-758623 · Space group: P-1 (#2)

Basic Information

Formula
Li6FeNi9O20
MP-ID
mp-758623
Elements
4
Sites
36
Density
4.5923
g/cm³
Volume
341.96
ų
Cell a
7.5566
Å
Cell b
7.6269
Å
Cell c
6.4863
Å
α Angle
92.61
°
β Angle
90.98
°
γ Angle
66.31
°
Space Group
P-1
Point Group
-1
Crystal System
Triclinic
Bravais Lattice
Triclinic P
Stability
No
Packing Fraction
0.5240

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
18.29 4.8513 100.0 (0,1,-1)
36.28 2.4758 13.5 (2,-1,-1)
37.06 2.4257 5.0 (0,2,-2)
37.10 2.4230 10.6 (3,2,0)
37.34 2.4084 10.5 (1,2,2)
38.08 2.3633 4.1 (2,0,-2)
38.63 2.3305 3.7 (3,1,1)
38.75 2.3237 3.7 (1,3,1)
43.62 2.0752 19.0 (2,-2,0)
44.53 2.0349 17.4 (3,3,-1)
44.82 2.0220 17.2 (1,1,3)
48.14 1.8901 3.2 (2,1,-3)
48.41 1.8801 3.8 (3,0,2)
48.42 1.8799 3.7 (1,4,0)
56.94 1.6171 1.5 (0,3,-3)
57.26 1.6090 4.7 (2,-3,1)
58.18 1.5858 5.0 (3,4,-2)
58.50 1.5777 4.8 (1,0,4)
63.48 1.4653 4.8 (1,5,-1)
63.49 1.4653 4.5 (2,2,-4)
63.56 1.4639 4.7 (3,-1,3)
64.70 1.4408 4.8 (5,1,-1)
65.09 1.4330 4.8 (1,-3,-3)
66.54 1.4052 4.5 (4,4,2)
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Energy Properties

Formation Energy/atom
-1.28056
eV/atom
Energy/atom
-6.02790
eV/atom
Energy above Hull
0.0493
eV/atom
Uncorrected Energy
-4.9483
eV/atom
Volume/atom
9.50
ų
c/a Ratio
-

Electronic Properties

Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
9.9996
μB
Mag. Ordering
FM
Mag. Sites
10
Magnetization/Volume
0.029240
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.556
Element Family
Metalloid-Nonmetal
Solute Fraction
0.444
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0713
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.9067
J/mol·K
Ω Parameter
4.3536
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
40.951%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.9823
smaller = more stable mixing
VEC
5.111
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-1.204
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7728
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-758623
Reference Citation

The crystal structure and related material properties of Li6FeNi9O20 were obtained from the Materials Project database (MP-ID: mp-758623, 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

BibTeX
@article{Horton2025,
  author  = {Horton, Matthew K. and Huck, Patrick and Yang, Ruo Xi and Munro, Jason M. and Dwaraknath, Shyam and Ganose, Alex M. and Kingsbury, Ryan S. and Wen, Mingjian and Shen, Jimmy X. and Mathis, Tyler S. and Kaplan, Aaron D. and Berket, Karlo and Riebesell, Janosh and George, Janine and Rosen, Andrew S. and Spotte-Smith, Evan W. C. and McDermott, Matthew J. and Cohen, Orion A. and Dunn, Alex and Kuner, Matthew C. and Rignanese, Gian-Marco and Petretto, Guido and Waroquiers, David and Griffin, Sinead M. and Neaton, Jeffrey B. and Chrzan, Daryl C. and Asta, Mark and Hautier, Geoffroy and Cholia, Shreyas and Ceder, Gerbrand and Ong, Shyue Ping and Jain, Anubhav and Persson, Kristin A.},
  title   = {Accelerated data-driven materials science with the Materials Project},
  journal = {Nature Materials},
  year    = {2025},
  volume  = {24},
  number  = {10},
  pages   = {1522--1532},
  month   = {oct},
  doi     = {10.1038/s41563-025-02272-0},
  issn    = {1476-4660},
  url     = {https://doi.org/10.1038/s41563-025-02272-0},
  abstract = {The Materials Project was launched formally in 2011 to drive materials discovery forwards through high-throughput computation and open data. More than a decade later, the Materials Project has become an indispensable tool used by more than 600,000 materials researchers around the world. This Perspective describes how the Materials Project, as a data platform and a software ecosystem, has helped to shape research in data-driven materials science. We cover how sustainable software and computational methods have accelerated materials design while becoming more open source and collaborative in nature. Next, we present cases where the Materials Project was used to understand and discover functional materials. We then describe our efforts to meet the needs of an expanding user base, through technical infrastructure updates ranging from data architecture and cloud resources to interactive web applications. Finally, we discuss opportunities to better aid the research community, with the vision that more accessible and easy-to-understand materials data will result in democratized materials knowledge and an increasingly collaborative community.}
}

3D Crystal Structure Rendering

Loading 3D structure…

Style: Ball & Stick
Raw CIF Data
# generated using pymatgen
data_Li6FeNi9O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.55655010
_cell_length_b   7.62690086
_cell_length_c   6.48631716
_cell_angle_alpha   92.60887514
_cell_angle_beta   90.98041517
_cell_angle_gamma   66.30749938
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li6FeNi9O20
_chemical_formula_sum   'Li6 Fe1 Ni9 O20'
_cell_volume   341.96333302
_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  0.10000000  0.10000000  0.60000000  1.0
  Li  Li1  1  0.10000000  0.60000000  0.10000000  1.0
  Li  Li2  1  0.32122800  0.29752000  0.79547200  1.0
  Li  Li3  1  0.33205100  0.79731500  0.29997400  1.0
  Li  Li4  1  0.86794900  0.40268500  0.90002600  1.0
  Li  Li5  1  0.87877200  0.90248000  0.40452800  1.0
  Fe  Fe6  1  0.60000000  0.10000000  0.10000000  1.0
  Ni  Ni7  1  0.19976900  0.19811500  0.20289200  1.0
  Ni  Ni8  1  0.00023100  0.00188500  0.99710800  1.0
  Ni  Ni9  1  0.19779900  0.69935600  0.69916500  1.0
  Ni  Ni10  1  0.39837800  0.39972700  0.40567100  1.0
  Ni  Ni11  1  0.39743300  0.89761500  0.89927300  1.0
  Ni  Ni12  1  0.60000000  0.60000000  0.60000000  1.0
  Ni  Ni13  1  0.80256700  0.30238500  0.30072700  1.0
  Ni  Ni14  1  0.80162200  0.80027300  0.79432900  1.0
  Ni  Ni15  1  0.00220100  0.50064400  0.50083500  1.0
  O  O16  1  0.06113000  0.05745700  0.28403400  1.0
  O  O17  1  0.13887000  0.14254300  0.91596600  1.0
  O  O18  1  0.05900400  0.55484200  0.77296600  1.0
  O  O19  1  0.23412800  0.27910600  0.48924600  1.0
  O  O20  1  0.14099600  0.64515800  0.42703400  1.0
  O  O21  1  0.34578500  0.33408600  0.12506900  1.0
  O  O22  1  0.23194600  0.77141400  0.97359500  1.0
  O  O23  1  0.54424200  0.04372700  0.83385600  1.0
  O  O24  1  0.42657400  0.47862700  0.67896000  1.0
  O  O25  1  0.34140700  0.83657800  0.62711800  1.0
  O  O26  1  0.65575800  0.15627300  0.36614400  1.0
  O  O27  1  0.54406800  0.53608600  0.33453000  1.0
  O  O28  1  0.76837800  0.23041700  0.02699900  1.0
  O  O29  1  0.43162200  0.96958300  0.17300100  1.0
  O  O30  1  0.65593200  0.66391400  0.86547000  1.0
  O  O31  1  0.85859300  0.36342200  0.57288200  1.0
  O  O32  1  0.77342600  0.72137200  0.52104000  1.0
  O  O33  1  0.96805400  0.42858600  0.22640500  1.0
  O  O34  1  0.85421500  0.86591400  0.07493100  1.0
  O  O35  1  0.96587200  0.92089400  0.71075400  1.0
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