CaCoBiO5

High-Entropy Materials HEA

MP-ID: mp-1042661 · Space group: Pbca (#61)

Materials Project API

Basic Information

Formula

CaCoBiO5

MP-ID

mp-1042661

Elements

Sites

Density

5.2561

g/cm³

Volume

980.61

Å³

Cell a

5.5692

Cell b

11.3479

Cell c

15.5165

α Angle

90.00

β Angle

90.00

γ Angle

90.00

Space Group

Pbca

Point Group

mmm

Crystal System

Orthorhombic

Bravais Lattice

Stability

Packing Fraction

X-ray Diffraction

Diffraction Pattern

Target / Radiation

X-axis: 2θ (°); Y-axis: relative intensity; Cu Kα ; λ=1.5418 Å

Diffraction Peaks (Top 24)

2θ	d (Å)	I	hkl
11.41	7.7582	56.1	(0,0,2)
13.83	6.4045	2.6	(0,1,2)
15.62	5.6739	7.8	(0,2,0)
18.65	4.7586	5.6	(1,1,1)
19.38	4.5798	15.1	(0,2,2)
22.37	3.9745	8.8	(1,2,0)
22.93	3.8791	11.4	(0,0,4)
23.10	3.8502	37.0	(1,2,1)
24.25	3.6706	6.0	(0,1,4)
24.77	3.5947	12.6	(1,1,3)
25.18	3.5373	9.7	(1,2,2)
26.21	3.4000	2.6	(0,3,2)
27.86	3.2023	10.0	(0,2,4)
28.32	3.1515	100.0	(1,2,3)
29.14	3.0648	1.3	(1,1,4)
31.54	2.8370	12.7	(0,4,0)
32.15	2.7846	15.5	(2,0,0)
32.25	2.7761	2.3	(1,2,4)
32.67	2.7408	8.6	(2,0,1)
33.47	2.6773	7.1	(1,3,3)
33.64	2.6644	4.8	(0,4,2)
34.21	2.6209	6.0	(2,0,2)
34.69	2.5861	10.2	(0,0,6)
35.61	2.5214	5.9	(0,1,6)

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Energy Properties

Formation Energy/atom

-1.74164

eV/atom

Energy/atom

-6.46274

eV/atom

Energy above Hull

0.1004

eV/atom

Uncorrected Energy

-5.8286

eV/atom

Volume/atom

15.32

Å³

c/a Ratio

2.7862

Electronic Properties

Metallic

Metal

Band Gap

Direct Gap

CBM

N/A

Magnetic Properties

Magnetic

Yes

Total Mag. Moment

32.0023

μB

Mag. Ordering

Mag. Sites

Magnetization/Volume

0.032640

μB/Å³

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)

Composition Info

Major / Matrix Element

O · 0.625

Element Family

Metalloid-Nonmetal

Solute Fraction

0.375

Interstitial Fraction

0.000

High-Entropy Alloy Features

Composite Radar (normalized)

Element-Class Share

Mix Entropy ΔS/R

1.0735

HEA criterion (>1.0 = high entropy)

Mix Entropy ΔS

8.9254

J/mol·K

Ω Parameter

2.0310

Ω > 1.1 favors solid solution

Atomic Size Mismatch δr

53.150%

δr < 6.6% favors single-phase solid solution

Electronegativity Diff Δχ

0.9173

smaller = more stable mixing

VEC

4.500

valence electron concentration, affects phase stability

Mix Enthalpy ΔH_mix

-2.033

kJ/mol; negative = exothermic mixing

Entropy Norm

0.7744

SS Former

Phase Tendency

Related Tasks

Related computation task IDs (1)

aaaeazas

Citation & References

Materials Project Page

https://materialsproject.org/materials/mp-1042661

Reference Citation

The crystal structure and related material properties of CaCoBiO5 were obtained from the Materials Project database (MP-ID: mp-1042661, 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

Loading 3D structure…

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Raw CIF Data

# generated using pymatgen
data_CaCoBiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.56914800
_cell_length_b   11.34785300
_cell_length_c   15.51648500
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CaCoBiO5
_chemical_formula_sum   'Ca8 Co8 Bi8 O40'
_cell_volume   980.60884594
_cell_formula_units_Z   8
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  0.50327500  0.35944400  0.44917500  1.0
  Ca  Ca1  1  0.00327500  0.14055600  0.44917500  1.0
  Ca  Ca2  1  0.00327500  0.64055600  0.05082500  1.0
  Ca  Ca3  1  0.99672500  0.35944400  0.94917500  1.0
  Ca  Ca4  1  0.49672500  0.14055600  0.94917500  1.0
  Ca  Ca5  1  0.99672500  0.85944400  0.55082500  1.0
  Ca  Ca6  1  0.49672500  0.64055600  0.55082500  1.0
  Ca  Ca7  1  0.50327500  0.85944400  0.05082500  1.0
  Co  Co8  1  0.98190500  0.40559400  0.59930300  1.0
  Co  Co9  1  0.51809500  0.90559400  0.40069700  1.0
  Co  Co10  1  0.01809500  0.59440600  0.40069700  1.0
  Co  Co11  1  0.48190500  0.09440600  0.59930300  1.0
  Co  Co12  1  0.01809500  0.09440600  0.09930300  1.0
  Co  Co13  1  0.98190500  0.90559400  0.90069700  1.0
  Co  Co14  1  0.51809500  0.40559400  0.09930300  1.0
  Co  Co15  1  0.48190500  0.59440600  0.90069700  1.0
  Bi  Bi16  1  0.94468500  0.84413300  0.23251300  1.0
  Bi  Bi17  1  0.05531500  0.15586700  0.76748700  1.0
  Bi  Bi18  1  0.55531500  0.34413300  0.76748700  1.0
  Bi  Bi19  1  0.05531500  0.65586700  0.73251300  1.0
  Bi  Bi20  1  0.44468500  0.15586700  0.26748700  1.0
  Bi  Bi21  1  0.44468500  0.65586700  0.23251300  1.0
  Bi  Bi22  1  0.55531500  0.84413300  0.73251300  1.0
  Bi  Bi23  1  0.94468500  0.34413300  0.26748700  1.0
  O  O24  1  0.92810000  0.32485300  0.69791400  1.0
  O  O25  1  0.30666200  0.04770300  0.07057100  1.0
  O  O26  1  0.19333800  0.54770300  0.92942900  1.0
  O  O27  1  0.23862200  0.77106700  0.15151400  1.0
  O  O28  1  0.26137800  0.27106700  0.84848600  1.0
  O  O29  1  0.92810000  0.82485300  0.80208600  1.0
  O  O30  1  0.26137800  0.77106700  0.65151400  1.0
  O  O31  1  0.57190000  0.82485300  0.30208600  1.0
  O  O32  1  0.30666200  0.54770300  0.42942900  1.0
  O  O33  1  0.07190000  0.67514700  0.30208600  1.0
  O  O34  1  0.57190000  0.32485300  0.19791400  1.0
  O  O35  1  0.62427000  0.18027400  0.52346300  1.0
  O  O36  1  0.80666200  0.95229700  0.42942900  1.0
  O  O37  1  0.76137800  0.72893300  0.65151400  1.0
  O  O38  1  0.17382400  0.02596700  0.86866600  1.0
  O  O39  1  0.80666200  0.45229700  0.07057100  1.0
  O  O40  1  0.07190000  0.17514700  0.19791400  1.0
  O  O41  1  0.73862200  0.22893300  0.34848600  1.0
  O  O42  1  0.12427000  0.81972600  0.97653700  1.0
  O  O43  1  0.19333800  0.04770300  0.57057100  1.0
  O  O44  1  0.37573000  0.81972600  0.47653700  1.0
  O  O45  1  0.82617600  0.97403300  0.13133400  1.0
  O  O46  1  0.76137800  0.22893300  0.84848600  1.0
  O  O47  1  0.67382400  0.97403300  0.63133400  1.0
  O  O48  1  0.37573000  0.31972600  0.02346300  1.0
  O  O49  1  0.12427000  0.31972600  0.52346300  1.0
  O  O50  1  0.69333800  0.45229700  0.57057100  1.0
  O  O51  1  0.69333800  0.95229700  0.92942900  1.0
  O  O52  1  0.67382400  0.47403300  0.86866600  1.0
  O  O53  1  0.87573000  0.68027400  0.47653700  1.0
  O  O54  1  0.87573000  0.18027400  0.02346300  1.0
  O  O55  1  0.62427000  0.68027400  0.97653700  1.0
  O  O56  1  0.82617600  0.47403300  0.36866600  1.0
  O  O57  1  0.73862200  0.72893300  0.15151400  1.0
  O  O58  1  0.23862200  0.27106700  0.34848600  1.0
  O  O59  1  0.17382400  0.52596700  0.63133400  1.0
  O  O60  1  0.32617600  0.52596700  0.13133400  1.0
  O  O61  1  0.42810000  0.17514700  0.69791400  1.0
  O  O62  1  0.32617600  0.02596700  0.36866600  1.0
  O  O63  1  0.42810000  0.67514700  0.80208600  1.0

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