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HoEr(NiH4)2

High-Entropy Materials HEA

MP-ID: mp-3251344 · Space group: Amm2 (#38)

Basic Information

Formula
HoEr(NiH4)2
MP-ID
mp-3251344
Elements
4
Sites
12
Density
7.9946
g/cm³
Volume
95.06
ų
Cell a
3.5859
Å
Cell b
4.6521
Å
Cell c
5.9746
Å
α Angle
90.00
°
β Angle
107.50
°
γ Angle
90.00
°
Space Group
Amm2
Point Group
mm2
Crystal System
Orthorhombic
Bravais Lattice
Orthorhombic P
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
24.71 3.6036 42.3 (0,1,-1)
24.71 3.6036 42.3 (0,1,1)
26.05 3.4212 10.8 (1,0,-1)
26.06 3.4199 10.4 (1,0,0)
31.40 2.8491 100.0 (0,0,2)
32.49 2.7561 53.9 (1,1,-1)
32.49 2.7561 53.9 (1,-1,-1)
32.49 2.7555 52.7 (1,-1,0)
32.49 2.7555 52.7 (1,1,0)
34.38 2.6084 24.7 (1,0,-2)
34.40 2.6068 25.6 (1,0,1)
37.00 2.4296 9.8 (0,1,-2)
37.00 2.4296 9.8 (0,1,2)
38.71 2.3261 67.9 (0,2,0)
39.61 2.2752 30.7 (1,1,-2)
39.61 2.2752 30.7 (1,-1,-2)
39.63 2.2741 30.8 (1,-1,1)
39.63 2.2741 30.8 (1,1,1)
47.25 1.9236 2.7 (1,2,-1)
47.25 1.9236 2.7 (1,-2,-1)
47.26 1.9234 2.6 (1,-2,0)
47.26 1.9234 2.6 (1,2,0)
50.66 1.8018 26.7 (0,2,-2)
50.66 1.8018 26.7 (0,2,2)
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Energy Properties

Formation Energy/atom
-0.53891
eV/atom
Energy/atom
-10.40650
eV/atom
Energy above Hull
0.0000
eV/atom
Uncorrected Energy
-10.4065
eV/atom
Volume/atom
7.92
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
0.0000
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.000000
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
H · 0.667
Element Family
Alkali-AlkEarth
Solute Fraction
0.333
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9831
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.1734
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
90.990%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.3542
smaller = more stable mixing
VEC
4.250
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.7091
SS Former
0
Phase Tendency
IM

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-3251344
Reference Citation

The crystal structure and related material properties of HoEr(NiH4)2 were obtained from the Materials Project database (MP-ID: mp-3251344, 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_HoEr(NiH4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.58588075
_cell_length_b   4.65214374
_cell_length_c   5.97458833
_cell_angle_alpha   90.00016334
_cell_angle_beta   107.49923397
_cell_angle_gamma   89.99999815
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HoEr(NiH4)2
_chemical_formula_sum   'Ho1 Er1 Ni2 H8'
_cell_volume   95.05572665
_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
  Ho  Ho0  1  0.13359570  0.24999821  0.26734499  1.0
  Er  Er1  1  0.86613623  0.75000303  0.73233904  1.0
  Ni  Ni2  1  0.59292812  0.74999757  0.19082491  1.0
  Ni  Ni3  1  0.40697052  0.25000340  0.80864068  1.0
  H  H4  1  0.49998025  0.00007176  0.99990267  1.0
  H  H5  1  0.49997924  0.49993076  0.99990095  1.0
  H  H6  1  0.08498369  0.75000168  0.16983641  1.0
  H  H7  1  0.69319722  0.00108028  0.38623740  1.0
  H  H8  1  0.69319795  0.49892097  0.38623853  1.0
  H  H9  1  0.30751345  0.50349064  0.61527291  1.0
  H  H10  1  0.30751565  0.99650729  0.61527636  1.0
  H  H11  1  0.91400198  0.24999942  0.82818415  1.0
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