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Li2Fe(PO3)8

High-Entropy Materials HEA

MP-ID: mp-694564 · Space group: P1 (#1)

Basic Information

Formula
Li2Fe(PO3)8
MP-ID
mp-694564
Elements
4
Sites
35
Density
2.6712
g/cm³
Volume
436.08
ų
Cell a
7.2566
Å
Cell b
7.2975
Å
Cell c
9.7732
Å
α Angle
69.58
°
β Angle
82.02
°
γ Angle
109.91
°
Space Group
P1
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
10.10 8.7587 25.2 (0,0,1)
13.52 6.5477 1.4 (0,1,1)
14.26 6.2090 7.7 (0,1,0)
14.36 6.1671 7.5 (1,0,1)
15.02 5.8992 5.5 (1,-1,0)
16.91 5.2446 24.9 (1,-1,-1)
19.19 4.6244 6.1 (1,0,-1)
19.20 4.6234 5.5 (0,1,2)
19.28 4.6035 100.0 (1,-1,1)
20.28 4.3793 1.1 (0,0,2)
20.76 4.2787 25.9 (0,1,-1)
20.86 4.2576 29.8 (1,0,2)
21.26 4.1784 5.1 (1,1,1)
23.55 3.7784 3.4 (1,-1,-2)
23.56 3.7763 2.3 (1,1,0)
23.62 3.7662 3.3 (1,1,2)
24.84 3.5845 6.0 (1,-2,-1)
24.95 3.5688 7.2 (2,-1,0)
26.05 3.4201 7.0 (0,2,1)
26.11 3.4128 20.2 (1,-2,0)
26.21 3.3995 5.3 (2,0,1)
26.25 3.3956 16.6 (2,-1,1)
27.00 3.3022 1.9 (1,-1,2)
27.24 3.2738 51.7 (0,2,2)
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Energy Properties

Formation Energy/atom
-2.34865
eV/atom
Energy/atom
-7.33044
eV/atom
Energy above Hull
0.0834
eV/atom
Uncorrected Energy
-6.7949
eV/atom
Volume/atom
12.46
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
8.0035
μB
Mag. Ordering
FM
Mag. Sites
6
Magnetization/Volume
0.018350
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.686
Element Family
Metalloid-Nonmetal
Solute Fraction
0.314
Interstitial Fraction
0.229

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.8612
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
7.1600
J/mol·K
Ω Parameter
0.2115
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
36.769%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.7443
smaller = more stable mixing
VEC
4.171
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-6.358
kJ/mol; negative = exothermic mixing
Entropy Norm
0.6212
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-694564
Reference Citation

The crystal structure and related material properties of Li2Fe(PO3)8 were obtained from the Materials Project database (MP-ID: mp-694564, 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_Li2Fe(PO3)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.25657211
_cell_length_b   7.29751233
_cell_length_c   9.77324011
_cell_angle_alpha   69.57794641
_cell_angle_beta   82.02154680
_cell_angle_gamma   109.91362096
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2Fe(PO3)8
_chemical_formula_sum   'Li2 Fe1 P8 O24'
_cell_volume   436.08107096
_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  0.48793600  0.99711300  0.50532200  1.0
  Li  Li1  1  0.05224600  0.80243100  0.75204900  1.0
  Fe  Fe2  1  0.94994300  0.19485500  0.24676200  1.0
  P  P3  1  0.70572700  0.50790100  0.29649600  1.0
  P  P4  1  0.25827600  0.29186800  0.47249200  1.0
  P  P5  1  0.68576600  0.99269000  0.81100000  1.0
  P  P6  1  0.30228800  0.49634200  0.68987800  1.0
  P  P7  1  0.72453700  0.27205600  0.98141900  1.0
  P  P8  1  0.26320800  0.73087100  0.02782600  1.0
  P  P9  1  0.75282700  0.70560700  0.52071100  1.0
  P  P10  1  0.30437300  0.00310700  0.20282800  1.0
  O  O11  1  0.19096100  0.86723100  0.91542300  1.0
  O  O12  1  0.48714600  0.20547700  0.06126000  1.0
  O  O13  1  0.72683800  0.89849300  0.41346400  1.0
  O  O14  1  0.73408000  0.30524700  0.31140300  1.0
  O  O15  1  0.76982300  0.55456700  0.43608600  1.0
  O  O16  1  0.23144400  0.44464400  0.55457700  1.0
  O  O17  1  0.88101500  0.96036600  0.80818100  1.0
  O  O18  1  0.92144200  0.74354500  0.59177100  1.0
  O  O19  1  0.81652400  0.70202400  0.14802300  1.0
  O  O20  1  0.50121700  0.78776300  0.94667900  1.0
  O  O21  1  0.46517000  0.45759500  0.33104900  1.0
  O  O22  1  0.08361900  0.25206400  0.40390400  1.0
  O  O23  1  0.11491000  0.04513900  0.19450900  1.0
  O  O24  1  0.28562100  0.79802200  0.16775300  1.0
  O  O25  1  0.65009500  0.03552000  0.65731300  1.0
  O  O26  1  0.18926600  0.30712200  0.84474600  1.0
  O  O27  1  0.80744900  0.14277500  0.09253000  1.0
  O  O28  1  0.35510700  0.96293400  0.34915000  1.0
  O  O29  1  0.27639700  0.69423700  0.68442500  1.0
  O  O30  1  0.83390800  0.51110100  0.90864300  1.0
  O  O31  1  0.15713600  0.48902200  0.09657200  1.0
  O  O32  1  0.69944800  0.19260100  0.84706800  1.0
  O  O33  1  0.53998500  0.54213900  0.65413300  1.0
  O  O34  1  0.29235200  0.11176300  0.57861000  1.0
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