Ta7(P2O7)8

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-758374 · Space group: R-3 (#148)

Materials Project API

Basic Information

Formula

Ta7(P2O7)8

MP-ID

mp-758374

Elements

Sites

Density

3.7890

g/cm³

Volume

1,164.97

Å³

Cell a

11.7846

Cell b

11.7846

Cell c

11.7846

α Angle

60.29

β Angle

60.29

γ Angle

60.29

Space Group

R-3

Point Group

-3

Crystal System

Trigonal

Bravais Lattice

Trigonal R

Stability

Packing Fraction

0.7400

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
9.16	9.6577	8.4	(1,0,0)
9.21	9.6006	2.9	(1,1,1)
10.59	8.3514	5.9	(1,1,0)
14.97	5.9185	2.7	(1,0,-1)
15.04	5.8922	2.8	(2,1,1)
17.58	5.0463	2.0	(1,1,-1)
17.60	5.0381	3.8	(2,1,0)
17.66	5.0218	2.0	(2,2,1)
18.37	4.8288	55.2	(2,0,0)
18.48	4.8003	18.1	(2,2,2)
21.28	4.1757	100.0	(2,2,0)
23.16	3.8400	1.8	(2,0,-1)
23.78	3.7415	16.8	(2,1,-1)
23.87	3.7282	4.8	(3,2,1)
26.08	3.4170	1.4	(2,-1,-1)
26.12	3.4120	10.2	(3,1,0)
26.24	3.3968	8.8	(3,3,2)
27.71	3.2192	1.4	(2,2,-1)
27.75	3.2150	1.7	(3,2,0)
30.20	2.9593	23.3	(2,0,-2)
30.34	2.9461	23.4	(4,2,2)
31.62	2.8294	1.0	(2,1,-2)
32.09	2.7893	1.0	(3,0,-1)
32.15	2.7838	1.1	(3,3,0)

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Energy Properties

Formation Energy/atom

-2.78547

eV/atom

Energy/atom

-8.44119

eV/atom

Energy above Hull

0.0535

eV/atom

Uncorrected Energy

-7.9542

eV/atom

Volume/atom

14.75

Å³

c/a Ratio

1.0000

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

2.8744

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.002470

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

O · 0.709

Element Family

Metalloid-Nonmetal

Solute Fraction

0.291

Interstitial Fraction

0.203

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

0.7821

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

6.5022

J/mol·K

Ω Parameter

1.4937

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

37.427%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.6850

smaller = more stable mixing

VEC

4.291

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-1.718

kJ/mol; negative = exothermic mixing

Entropy Norm

0.7119

SS Former

Phase Tendency

Traditional Material Features

ROM Blended-Feature Radar

Rating & Classification

Tier

Score

0.627

Family

Interstitial Alloy

Matrix Element

O · 0.709

Related Tasks

Related computation task IDs (2)

aaabywnn aaaczson

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-758374

Reference Citation

The crystal structure and related material properties of Ta7(P2O7)8 were obtained from the Materials Project database (MP-ID: mp-758374, 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_Ta7(P2O7)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.78461149
_cell_length_b   11.78461149
_cell_length_c   11.78461123
_cell_angle_alpha   60.29423094
_cell_angle_beta   60.29423094
_cell_angle_gamma   60.29422940
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta7(P2O7)8
_chemical_formula_sum   'Ta7 P16 O56'
_cell_volume   1164.96518169
_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
  Ta  Ta0  1  0.00000000  0.00000000  0.50000000  1.0
  Ta  Ta1  1  0.00000000  0.50000000  0.00000000  1.0
  Ta  Ta2  1  0.50000000  0.00000000  0.50000000  1.0
  Ta  Ta3  1  0.50000000  0.00000000  0.00000000  1.0
  Ta  Ta4  1  0.50000000  0.50000000  0.50000000  1.0
  Ta  Ta5  1  0.00000000  0.50000000  0.50000000  1.0
  Ta  Ta6  1  0.50000000  0.50000000  0.00000000  1.0
  P  P7  1  0.69624900  0.19879900  0.40896400  1.0
  P  P8  1  0.30274600  0.07964400  0.81035000  1.0
  P  P9  1  0.92035600  0.18965000  0.69725400  1.0
  P  P10  1  0.80120100  0.59103600  0.30375100  1.0
  P  P11  1  0.59103600  0.30375100  0.80120100  1.0
  P  P12  1  0.19463700  0.19463700  0.19463700  1.0
  P  P13  1  0.81035000  0.30274600  0.07964400  1.0
  P  P14  1  0.69512700  0.69512700  0.69512700  1.0
  P  P15  1  0.30487300  0.30487300  0.30487300  1.0
  P  P16  1  0.18965000  0.69725400  0.92035600  1.0
  P  P17  1  0.80536300  0.80536300  0.80536300  1.0
  P  P18  1  0.40896400  0.69624900  0.19879900  1.0
  P  P19  1  0.19879900  0.40896400  0.69624900  1.0
  P  P20  1  0.07964400  0.81035000  0.30274600  1.0
  P  P21  1  0.69725400  0.92035600  0.18965000  1.0
  P  P22  1  0.30375100  0.80120100  0.59103600  1.0
  O  O23  1  0.74337400  0.26300600  0.24860000  1.0
  O  O24  1  0.62344700  0.09819600  0.45679100  1.0
  O  O25  1  0.81981200  0.12448400  0.45971700  1.0
  O  O26  1  0.38767700  0.03995100  0.67459600  1.0
  O  O27  1  0.95978900  0.12715900  0.58650700  1.0
  O  O28  1  0.87551600  0.54028300  0.18018800  1.0
  O  O29  1  0.59462800  0.32013700  0.46461700  1.0
  O  O30  1  0.90180400  0.54320900  0.37655300  1.0
  O  O31  1  0.41349300  0.04021100  0.87284100  1.0
  O  O32  1  0.96767600  0.09183300  0.81552300  1.0
  O  O33  1  0.18447700  0.03232400  0.90816700  1.0
  O  O34  1  0.96004900  0.32540400  0.61232300  1.0
  O  O35  1  0.67986300  0.53538300  0.40537200  1.0
  O  O36  1  0.26300600  0.24860000  0.74337400  1.0
  O  O37  1  0.75140000  0.25662600  0.73699400  1.0
  O  O38  1  0.73699400  0.75140000  0.25662600  1.0
  O  O39  1  0.54028300  0.18018800  0.87551600  1.0
  O  O40  1  0.53538300  0.40537200  0.67986300  1.0
  O  O41  1  0.31936100  0.09518600  0.12256900  1.0
  O  O42  1  0.81969200  0.59371000  0.62497300  1.0
  O  O43  1  0.90816700  0.18447700  0.03232400  1.0
  O  O44  1  0.54320900  0.37655300  0.90180400  1.0
  O  O45  1  0.12256900  0.31936100  0.09518600  1.0
  O  O46  1  0.67459600  0.38767700  0.03995100  1.0
  O  O47  1  0.62497300  0.81969200  0.59371000  1.0
  O  O48  1  0.59371000  0.62497300  0.81969200  1.0
  O  O49  1  0.09518600  0.12256900  0.31936100  1.0
  O  O50  1  0.87284100  0.41349300  0.04021100  1.0
  O  O51  1  0.75020000  0.75020000  0.75020000  1.0
  O  O52  1  0.25662600  0.73699400  0.75140000  1.0
  O  O53  1  0.24980000  0.24980000  0.24980000  1.0
  O  O54  1  0.90481400  0.87743100  0.68063900  1.0
  O  O55  1  0.12715900  0.58650700  0.95978900  1.0
  O  O56  1  0.40629000  0.37502700  0.18030800  1.0
  O  O57  1  0.32540400  0.61232300  0.96004900  1.0
  O  O58  1  0.37502700  0.18030800  0.40629000  1.0
  O  O59  1  0.87743100  0.68063900  0.90481400  1.0
  O  O60  1  0.45679100  0.62344700  0.09819600  1.0
  O  O61  1  0.09183300  0.81552300  0.96767600  1.0
  O  O62  1  0.68063900  0.90481400  0.87743100  1.0
  O  O63  1  0.18030800  0.40629000  0.37502700  1.0
  O  O64  1  0.46461700  0.59462800  0.32013700  1.0
  O  O65  1  0.45971700  0.81981200  0.12448400  1.0
  O  O66  1  0.24860000  0.74337400  0.26300600  1.0
  O  O67  1  0.32013700  0.46461700  0.59462800  1.0
  O  O68  1  0.81552300  0.96767600  0.09183300  1.0
  O  O69  1  0.03995100  0.67459600  0.38767700  1.0
  O  O70  1  0.03232400  0.90816700  0.18447700  1.0
  O  O71  1  0.09819600  0.45679100  0.62344700  1.0
  O  O72  1  0.58650700  0.95978900  0.12715900  1.0
  O  O73  1  0.40537200  0.67986300  0.53538300  1.0
  O  O74  1  0.61232300  0.96004900  0.32540400  1.0
  O  O75  1  0.12448400  0.45971700  0.81981200  1.0
  O  O76  1  0.04021100  0.87284100  0.41349300  1.0
  O  O77  1  0.18018800  0.87551600  0.54028300  1.0
  O  O78  1  0.37655300  0.90180400  0.54320900  1.0

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