Basic Information
Formula
EuClO2
MP-ID
mp-1025494
Elements
3
Sites
8
Density
5.1686
g/cm³
Volume
140.99
ų
Cell a
3.7726
Å
Cell b
6.3897
Å
Cell c
6.4984
Å
α Angle
64.16
°
β Angle
90.00
°
γ Angle
90.00
°
Space Group
P2_1/m
Point Group
2/m
Crystal System
Monoclinic
Bravais Lattice
mP
Stability
No
Packing Fraction
-
X-ray Diffraction
Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å
Diffraction Peaks (Top 24)
| 2θ | d (Å) | I | hkl |
|---|---|---|---|
| 15.15 | 5.8487 | 99.8 | (0,0,1) |
| 15.41 | 5.7508 | 31.4 | (0,1,0) |
| 16.24 | 5.4592 | 34.1 | (0,1,1) |
| 26.04 | 3.4222 | 54.6 | (0,1,-1) |
| 27.54 | 3.2387 | 35.9 | (0,1,2) |
| 27.98 | 3.1887 | 23.7 | (0,2,1) |
| 28.15 | 3.1703 | 33.6 | (1,0,1) |
| 28.29 | 3.1544 | 45.5 | (1,1,0) |
| 28.77 | 3.1036 | 100.0 | (1,1,1) |
| 30.57 | 2.9243 | 3.3 | (0,0,2) |
| 31.10 | 2.8754 | 28.5 | (0,2,0) |
| 32.81 | 2.7296 | 32.5 | (0,2,2) |
| 35.41 | 2.5347 | 30.5 | (1,1,-1) |
| 38.97 | 2.3113 | 56.8 | (1,0,2) |
| 39.40 | 2.2869 | 32.8 | (1,2,0) |
| 40.23 | 2.2417 | 8.3 | (0,1,-2) |
| 40.55 | 2.2249 | 1.1 | (0,2,-1) |
| 40.80 | 2.2114 | 26.8 | (1,2,2) |
| 41.95 | 2.1537 | 26.3 | (0,1,3) |
| 43.75 | 2.0692 | 2.5 | (0,3,2) |
| 46.59 | 1.9496 | 9.5 | (0,0,3) |
| 47.16 | 1.9271 | 4.1 | (1,1,-2) |
| 47.43 | 1.9169 | 8.3 | (0,3,0) |
| 47.44 | 1.9164 | 30.0 | (1,2,-1) |
Energy Properties
Formation Energy/atom
-1.68175
eV/atom
Energy/atom
-7.18989
eV/atom
Energy above Hull
0.6176
eV/atom
Uncorrected Energy
-6.8464
eV/atom
Volume/atom
17.62
ų
c/a Ratio
1.7225
Electronic Properties
Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV
Magnetic Properties
Magnetic
Yes
Total Mag. Moment
8.0000
μB
Mag. Ordering
FiM
Mag. Sites
8
Magnetization/Volume
0.056740
μB/ų
Elastic Properties
Elastic data not available
Feature Analysis
Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.500
Element Family
Metalloid-Nonmetal
Solute Fraction
0.500
Interstitial Fraction
0.000
Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
1.0397
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
8.6442
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
50.406%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.9365
smaller = more stable mixing
VEC
5.000
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9464
SS Former
0
Phase Tendency
IM
Related Tasks
Citation & References
Materials Project Page
https://materialsproject.org/materials/mp-1025494
Reference Citation
The crystal structure and related material properties of EuClO2 were obtained from the Materials Project database (MP-ID: mp-1025494, 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
3D Crystal Structure Rendering
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Raw CIF Data
# generated using pymatgen
data_EuClO2
_symmetry_space_group_name_H-M 'P 1'
_cell_length_a 3.77257400
_cell_length_b 6.38965200
_cell_length_c 6.49841541
_cell_angle_alpha 64.16035573
_cell_angle_beta 90.00000000
_cell_angle_gamma 90.00000000
_symmetry_Int_Tables_number 1
_chemical_formula_structural EuClO2
_chemical_formula_sum 'Eu2 Cl2 O4'
_cell_volume 140.98514434
_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
Eu Eu0 1 0.25000000 0.18945400 0.62091800 1.0
Eu Eu1 1 0.75000000 0.81054600 0.37908200 1.0
Cl Cl2 1 0.25000000 0.74407000 0.05260200 1.0
Cl Cl3 1 0.75000000 0.25593000 0.94739800 1.0
O O4 1 0.25000000 0.59432100 0.56512500 1.0
O O5 1 0.75000000 0.40567900 0.43487500 1.0
O O6 1 0.25000000 0.04771600 0.34364000 1.0
O O7 1 0.75000000 0.95228400 0.65636000 1.0
