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Ca2Nb2MoO8

High-Entropy Materials HEA

MP-ID: mp-1047029 · Space group: C2/c (#15)

Basic Information

Formula
Ca2Nb2MoO8
MP-ID
mp-1047029
Elements
4
Sites
26
Density
4.7859
g/cm³
Volume
339.96
ų
Cell a
10.0844
Å
Cell b
10.0844
Å
Cell c
5.6077
Å
α Angle
87.73
°
β Angle
87.73
°
γ Angle
36.63
°
Space Group
C2/c
Point Group
2/m
Crystal System
Monoclinic
Bravais Lattice
Monoclinic C
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
9.25 9.5652 31.5 (1,1,0)
14.72 6.0163 4.0 (1,0,0)
18.55 4.7826 6.8 (2,2,0)
19.75 4.4953 63.1 (2,1,0)
21.53 4.1273 7.9 (1,0,1)
25.03 3.5577 30.9 (2,1,1)
25.77 3.4570 33.4 (2,1,-1)
27.23 3.2755 89.4 (3,2,0)
28.16 3.1690 9.5 (1,-1,0)
31.13 2.8728 98.9 (3,2,1)
31.95 2.8014 69.6 (0,0,2)
32.14 2.7848 83.8 (3,2,-1)
32.46 2.7583 100.0 (1,-1,1)
32.94 2.7192 1.5 (1,1,2)
33.63 2.6649 7.7 (2,0,1)
33.71 2.6587 1.1 (1,1,-2)
34.01 2.6360 1.9 (2,0,-1)
36.49 2.4624 5.7 (2,2,2)
37.30 2.4109 2.4 (3,1,1)
37.32 2.4095 2.0 (2,1,2)
37.61 2.3913 3.1 (4,4,0)
37.99 2.3685 17.6 (3,1,-1)
38.36 2.3468 4.9 (2,1,-2)
39.92 2.2583 1.7 (4,3,-1)
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Energy Properties

Formation Energy/atom
-2.87174
eV/atom
Energy/atom
-8.61352
eV/atom
Energy above Hull
0.1517
eV/atom
Uncorrected Energy
-7.9444
eV/atom
Volume/atom
13.08
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
8.0028
μB
Mag. Ordering
FM
Mag. Sites
6
Magnetization/Volume
0.023540
μB/ų

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
0.000

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
1.6178
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
53.409%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.9949
smaller = more stable mixing
VEC
4.000
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
4.689
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7733
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (3)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1047029
Reference Citation

The crystal structure and related material properties of Ca2Nb2MoO8 were obtained from the Materials Project database (MP-ID: mp-1047029, 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_Ca2Nb2MoO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.08436324
_cell_length_b   10.08436324
_cell_length_c   5.60769712
_cell_angle_alpha   87.73157591
_cell_angle_beta   87.73157591
_cell_angle_gamma   36.63050954
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2Nb2MoO8
_chemical_formula_sum   'Ca4 Nb4 Mo2 O16'
_cell_volume   339.95780500
_cell_formula_units_Z   2
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
  Ca  Ca0  1  0.88695400  0.52823200  0.76007800  1.0
  Ca  Ca1  1  0.47176800  0.11304600  0.73992200  1.0
  Ca  Ca2  1  0.11304600  0.47176800  0.23992200  1.0
  Ca  Ca3  1  0.52823200  0.88695400  0.26007800  1.0
  Nb  Nb4  1  0.03122400  0.74267800  0.76191500  1.0
  Nb  Nb5  1  0.25732200  0.96877600  0.73808500  1.0
  Nb  Nb6  1  0.96877600  0.25732200  0.23808500  1.0
  Nb  Nb7  1  0.74267800  0.03122400  0.26191500  1.0
  Mo  Mo8  1  0.63423600  0.36576400  0.75000000  1.0
  Mo  Mo9  1  0.36576400  0.63423600  0.25000000  1.0
  O  O10  1  0.05973200  0.80313000  0.09464000  1.0
  O  O11  1  0.19687000  0.94026800  0.40536000  1.0
  O  O12  1  0.94026800  0.19687000  0.90536000  1.0
  O  O13  1  0.80313000  0.05973200  0.59464000  1.0
  O  O14  1  0.30972300  0.57720800  0.59464900  1.0
  O  O15  1  0.42279200  0.69027700  0.90535100  1.0
  O  O16  1  0.69027700  0.42279200  0.40535100  1.0
  O  O17  1  0.57720800  0.30972300  0.09464900  1.0
  O  O18  1  0.88128400  0.76110900  0.49221400  1.0
  O  O19  1  0.23889100  0.11871600  0.00778600  1.0
  O  O20  1  0.46292700  0.16279800  0.34231300  1.0
  O  O21  1  0.83720200  0.53707300  0.15768700  1.0
  O  O22  1  0.53707300  0.83720200  0.65768700  1.0
  O  O23  1  0.16279800  0.46292700  0.84231300  1.0
  O  O24  1  0.76110900  0.88128400  0.99221400  1.0
  O  O25  1  0.11871600  0.23889100  0.50778600  1.0
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