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Ba2Ho(CuO2)4

High-Entropy Materials HEA Elasticity Data ELA

MP-ID: mp-6205 · Space group: Cmmm (#65)

Basic Information

Formula
Ba2Ho(CuO2)4
MP-ID
mp-6205
Elements
4
Sites
15
Density
6.5752
g/cm³
Volume
207.53
ų
Cell a
13.8740
Å
Cell b
13.8740
Å
Cell c
3.8795
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
163.86
°
Space Group
Cmmm
Point Group
mmm
Crystal System
Orthorhombic
Bravais Lattice
Orthorhombic C
Stability
Yes
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
6.43 13.7367 69.4 (1,-1,0)
19.39 4.5789 8.2 (3,-3,0)
22.92 3.8795 1.7 (0,0,1)
23.07 3.8558 15.3 (1,0,0)
23.83 3.7334 21.1 (1,-1,1)
25.95 3.4342 6.2 (4,-4,0)
26.39 3.3779 13.3 (2,-2,1)
30.19 2.9599 42.0 (3,-3,1)
32.39 2.7644 95.4 (4,-3,0)
32.59 2.7473 1.2 (5,-5,0)
32.75 2.7348 100.0 (1,0,1)
34.06 2.6324 8.8 (2,-1,1)
34.89 2.5714 64.6 (4,-4,1)
36.56 2.4581 3.7 (3,-2,1)
37.43 2.4025 12.6 (5,-4,0)
39.36 2.2894 4.4 (6,-6,0)
40.05 2.2513 18.6 (4,-3,1)
44.35 2.0425 10.2 (5,-4,1)
46.03 1.9717 2.2 (6,-6,1)
46.26 1.9624 19.3 (7,-7,0)
46.65 1.9472 31.2 (1,1,0)
46.84 1.9397 30.8 (0,0,2)
47.14 1.9279 1.3 (2,0,0)
47.33 1.9207 1.2 (1,-1,2)
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Energy Properties

Formation Energy/atom
-2.06136
eV/atom
Energy/atom
-6.35577
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-5.9894
eV/atom
Volume/atom
13.84
ų
c/a Ratio
-

Electronic Properties

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

Magnetic Properties

Magnetic
No
Total Mag. Moment
0.0019
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000010
μB/ų

Elastic Properties

KVRH
104.048
GPa
GVRH
39.752
GPa
Young's Modulus E
105.784
GPa
Poisson Ratio ν
0.331
Pugh Ratio K/G
2.617
Vickers Hardness Est.
2.594
GPa
Ductility
Brittle
Anisotropy
3.027
Lame λ
77.547
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.533
Element Family
Metalloid-Nonmetal
Solute Fraction
0.467
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.1369
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
9.4523
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
52.790%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
1.0093
smaller = more stable mixing
VEC
6.067
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8201
SS Former
0
Phase Tendency
IM

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
3.0270
Homogeneous Poisson ν
0.3310
Debye Temperature
505.5
K
Sound Velocity
2,757.3
m/s
Homogeneity
0.3310

Related Tasks

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-6205
Reference Citation

The crystal structure and related material properties of Ba2Ho(CuO2)4 were obtained from the Materials Project database (MP-ID: mp-6205, 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_Ba2Ho(CuO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.87398175
_cell_length_b   13.87398175
_cell_length_c   3.87946000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   163.86412868
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ba2Ho(CuO2)4
_chemical_formula_sum   'Ba2 Ho1 Cu4 O8'
_cell_volume   207.53304020
_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
  Ba  Ba0  1  0.63554700  0.36445300  0.50000000  1.0
  Ba  Ba1  1  0.36445300  0.63554700  0.50000000  1.0
  Ho  Ho2  1  0.50000000  0.50000000  0.50000000  1.0
  Cu  Cu3  1  0.06091700  0.93908300  0.00000000  1.0
  Cu  Cu4  1  0.93908300  0.06091700  0.00000000  1.0
  Cu  Cu5  1  0.21260300  0.78739700  0.00000000  1.0
  Cu  Cu6  1  0.78739700  0.21260300  0.00000000  1.0
  O  O7  1  0.71845500  0.28154500  0.00000000  1.0
  O  O8  1  0.28154500  0.71845500  0.00000000  1.0
  O  O9  1  0.55149200  0.44850800  0.00000000  1.0
  O  O10  1  0.44850800  0.55149200  0.00000000  1.0
  O  O11  1  0.05161000  0.94839000  0.50000000  1.0
  O  O12  1  0.94839000  0.05161000  0.50000000  1.0
  O  O13  1  0.14524900  0.85475100  0.00000000  1.0
  O  O14  1  0.85475100  0.14524900  0.00000000  1.0
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