Li2Fe(PO4)2

High-Entropy Materials HEA

MP-ID: mp-697816 · Space group: P2_1 (#4)

Materials Project API

Basic Information

Formula

Li2Fe(PO4)2

MP-ID

mp-697816

Elements

Sites

Density

2.9867

g/cm³

Volume

577.48

Å³

Cell a

17.5532

Cell b

4.9288

Cell c

6.6906

α Angle

86.07

β Angle

90.00

γ Angle

90.00

Space Group

P2_1

Point Group

Crystal System

Monoclinic

Bravais Lattice

Monoclinic P

Stability

Packing Fraction

0.5240

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å

Diffraction Peaks (Top 24)

2θ	d (Å)	I	hkl
14.20	6.2390	100.0	(1,0,1)
20.18	4.3999	36.9	(3,0,1)
20.24	4.3883	3.1	(4,0,0)
20.71	4.2898	14.4	(2,1,0)
21.70	4.0953	1.9	(0,1,1)
22.29	3.9882	2.4	(1,1,1)
23.19	3.8354	1.2	(0,1,-1)
23.75	3.7470	34.4	(1,1,-1)
23.98	3.7111	70.5	(2,1,1)
24.27	3.6668	51.9	(4,0,1)
25.34	3.5145	57.1	(2,1,-1)
26.57	3.3551	27.5	(3,1,1)
26.71	3.3374	1.0	(0,0,2)
27.81	3.2077	3.1	(3,1,-1)
28.73	3.1071	1.8	(5,0,1)
29.84	2.9940	8.7	(4,1,1)
30.84	2.8990	4.5	(3,0,2)
30.97	2.8879	2.5	(4,1,-1)
31.31	2.8572	5.6	(5,1,0)
31.77	2.8169	6.1	(1,1,2)
33.01	2.7140	20.2	(2,1,2)
33.62	2.6653	6.0	(5,1,1)
33.74	2.6565	56.1	(4,0,2)
33.87	2.6469	7.3	(1,1,-2)

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Energy Properties

Formation Energy/atom

-2.37226

eV/atom

Energy/atom

-7.19553

eV/atom

Energy above Hull

0.0862

eV/atom

Uncorrected Energy

-6.5992

eV/atom

Volume/atom

11.11

Å³

c/a Ratio

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

24.0010

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.041560

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

O · 0.615

Element Family

Metalloid-Nonmetal

Solute Fraction

0.385

Interstitial Fraction

0.154

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.0720

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.9127

J/mol·K

Ω Parameter

0.2328

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

41.432%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.9425

smaller = more stable mixing

VEC

4.000

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-11.166

kJ/mol; negative = exothermic mixing

Entropy Norm

0.7733

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (2)

aaacbvyx aaaedewm

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-697816

Reference Citation

The crystal structure and related material properties of Li2Fe(PO4)2 were obtained from the Materials Project database (MP-ID: mp-697816, 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

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Raw CIF Data

# generated using pymatgen
data_Li2Fe(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.55322300
_cell_length_b   4.92880300
_cell_length_c   6.69059200
_cell_angle_alpha   86.06984180
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2Fe(PO4)2
_chemical_formula_sum   'Li8 Fe4 P8 O32'
_cell_volume   577.48453904
_cell_formula_units_Z   4
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  0.38350000  0.52638200  0.72771200  1.0
  Li  Li1  1  0.88350000  0.47361800  0.27228800  1.0
  Li  Li2  1  0.94366700  0.97873500  0.03943700  1.0
  Li  Li3  1  0.11318400  0.03246500  0.27337400  1.0
  Li  Li4  1  0.19769100  0.55937600  0.07432600  1.0
  Li  Li5  1  0.61318400  0.96753500  0.72662600  1.0
  Li  Li6  1  0.69769100  0.44062400  0.92567400  1.0
  Li  Li7  1  0.44366700  0.02126500  0.96056300  1.0
  Fe  Fe8  1  0.12774700  0.05583600  0.75561100  1.0
  Fe  Fe9  1  0.62774700  0.94416400  0.24438900  1.0
  Fe  Fe10  1  0.87082900  0.45083500  0.73086500  1.0
  Fe  Fe11  1  0.37082900  0.54916500  0.26913500  1.0
  P  P12  1  0.03599800  0.52689400  0.97765500  1.0
  P  P13  1  0.28585900  0.07857000  0.02985700  1.0
  P  P14  1  0.21451000  0.58351600  0.53157300  1.0
  P  P15  1  0.71451000  0.41648400  0.46842700  1.0
  P  P16  1  0.46429800  0.03051600  0.47573700  1.0
  P  P17  1  0.53599800  0.47310600  0.02234500  1.0
  P  P18  1  0.96429800  0.96948400  0.52426300  1.0
  P  P19  1  0.78585900  0.92143000  0.97014300  1.0
  O  O20  1  0.06072500  0.83320500  0.97117800  1.0
  O  O21  1  0.30306500  0.60710100  0.51183500  1.0
  O  O22  1  0.44323300  0.88760300  0.68208500  1.0
  O  O23  1  0.19058200  0.27931400  0.55465100  1.0
  O  O24  1  0.94323300  0.11239700  0.31791500  1.0
  O  O25  1  0.80306500  0.39289900  0.48816500  1.0
  O  O26  1  0.30397700  0.23909800  0.21579700  1.0
  O  O27  1  0.43414500  0.32666900  0.47163400  1.0
  O  O28  1  0.67836300  0.28806800  0.66115100  1.0
  O  O29  1  0.83917200  0.81493400  0.13960600  1.0
  O  O30  1  0.17836300  0.71193200  0.33884900  1.0
  O  O31  1  0.93414500  0.67333100  0.52836600  1.0
  O  O32  1  0.69133400  0.27255900  0.27756900  1.0
  O  O33  1  0.56809000  0.61668400  0.83035900  1.0
  O  O34  1  0.44692500  0.47850600  0.02878000  1.0
  O  O35  1  0.06754500  0.38647800  0.79564800  1.0
  O  O36  1  0.94692500  0.52149400  0.97122000  1.0
  O  O37  1  0.33917200  0.18506600  0.86039400  1.0
  O  O38  1  0.19949400  0.13760800  0.98865400  1.0
  O  O39  1  0.56072500  0.16679500  0.02882200  1.0
  O  O40  1  0.43022100  0.88735300  0.29600800  1.0
  O  O41  1  0.05260100  0.96945300  0.53734200  1.0
  O  O42  1  0.69949400  0.86239200  0.01134600  1.0
  O  O43  1  0.56754500  0.61352200  0.20435200  1.0
  O  O44  1  0.19133400  0.72744100  0.72243100  1.0
  O  O45  1  0.80015800  0.23131400  0.93050300  1.0
  O  O46  1  0.93022100  0.11264700  0.70399200  1.0
  O  O47  1  0.06809000  0.38331600  0.16964100  1.0
  O  O48  1  0.80397700  0.76090200  0.78420300  1.0
  O  O49  1  0.30015800  0.76868600  0.06949700  1.0
  O  O50  1  0.55260100  0.03054700  0.46265800  1.0
  O  O51  1  0.69058200  0.72068600  0.44534900  1.0

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