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K2Rh2O5

High-Entropy Materials HEA Traditional Materials TRA Elasticity Data ELA

MP-ID: mp-867920 · Space group: P4/mmm (#123)

Basic Information

Formula
K2Rh2O5
MP-ID
mp-867920
Elements
3
Sites
9
Density
4.8108
g/cm³
Volume
125.64
ų
Cell a
8.4406
Å
Cell b
3.8583
Å
Cell c
3.8581
Å
α Angle
90.00
°
β Angle
90.00
°
γ Angle
90.00
°
Space Group
P4/mmm
Point Group
4/mmm
Crystal System
Tetragonal
Bravais Lattice
Tetragonal P
Stability
Yes
Packing Fraction
0.6800

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
10.48 8.4406 6.7 (1,0,0)
21.05 4.2203 58.1 (2,0,0)
23.05 3.8583 31.4 (0,1,0)
23.05 3.8581 31.4 (0,0,1)
25.38 3.5090 2.8 (1,1,0)
25.38 3.5089 2.8 (1,0,1)
31.41 2.8476 100.0 (2,1,0)
31.42 2.8476 100.0 (2,0,1)
32.83 2.7282 69.5 (0,1,1)
34.55 2.5959 3.5 (1,1,1)
39.33 2.2911 3.6 (2,1,1)
42.86 2.1102 34.5 (4,0,0)
46.36 1.9586 2.7 (3,1,1)
47.11 1.9291 28.1 (0,2,0)
47.11 1.9291 28.1 (0,0,2)
49.22 1.8514 7.1 (4,1,0)
49.22 1.8513 7.1 (4,0,1)
52.13 1.7545 9.5 (2,2,0)
52.13 1.7545 9.5 (2,0,2)
53.08 1.7255 6.6 (0,2,1)
53.08 1.7254 6.6 (0,1,2)
55.02 1.6691 30.4 (4,1,1)
57.72 1.5971 33.3 (2,2,1)
57.72 1.5971 33.3 (2,1,2)
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Energy Properties

Formation Energy/atom
-1.22940
eV/atom
Energy/atom
-5.86620
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-11.0495
eV/atom
Volume/atom
13.96
ų
c/a Ratio
0.4571

Electronic Properties

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

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
4.0623
μB
Mag. Ordering
Unknown
Mag. Sites
0
Magnetization/Volume
0.032330
μB/ų

Elastic Properties

KVRH
84.380
GPa
GVRH
47.770
GPa
Young's Modulus E
120.559
GPa
Poisson Ratio ν
0.262
Pugh Ratio K/G
1.766
Vickers Hardness Est.
6.868
GPa
Ductility
Brittle
Anisotropy
1.640
Lame λ
52.533
GPa

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.556
Element Family
Metalloid-Nonmetal
Solute Fraction
0.444
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9950
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.2727
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
57.876%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
1.0578
smaller = more stable mixing
VEC
4.444
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9057
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.503
Family
O-rich Multi-Component
Matrix Element
O · 0.556

Elasticity Features

Elastic Modulus Comparison (GPa)
Elastic Features
Elastic Anisotropy AU
1.6400
Homogeneous Poisson ν
0.2620
Debye Temperature
523.7
K
Sound Velocity
3,503.3
m/s
Homogeneity
0.2620

Related Tasks

Related computation task IDs (4)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-867920
Reference Citation

The crystal structure and related material properties of K2Rh2O5 were obtained from the Materials Project database (MP-ID: mp-867920, 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_K2Rh2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.44058983
_cell_length_b   3.85825071
_cell_length_c   3.85811378
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2Rh2O5
_chemical_formula_sum   'K2 Rh2 O5'
_cell_volume   125.64299271
_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
  K  K0  1  -0.00000000  0.00000000  -0.00000000  1.0
  K  K1  1  0.50000000  0.00000000  -0.00000000  1.0
  Rh  Rh2  1  0.26286313  0.50000000  0.50000000  1.0
  Rh  Rh3  1  0.73713687  0.50000000  0.50000000  1.0
  O  O4  1  0.23219358  0.50000000  0.00000000  1.0
  O  O5  1  0.76780642  0.50000000  0.00000000  1.0
  O  O6  1  0.50000000  0.50000000  0.50000000  1.0
  O  O7  1  0.23224801  0.00000000  0.50000000  1.0
  O  O8  1  0.76775199  0.00000000  0.50000000  1.0
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