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Ca2Ti2O5

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1096895 · Space group: P2_1/c (#14)

Basic Information

Formula
Ca2Ti2O5
MP-ID
mp-1096895
Elements
3
Sites
36
Density
3.7089
g/cm³
Volume
458.26
ų
Cell a
7.7544
Å
Cell b
7.6088
Å
Cell c
10.8206
Å
α Angle
45.87
°
β Angle
90.00
°
γ Angle
90.00
°
Space Group
P2_1/c
Point Group
2/m
Crystal System
Monoclinic
Bravais Lattice
Monoclinic P
Stability
No
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
16.15 5.4876 5.7 (1,0,1)
22.90 3.8835 3.0 (0,0,2)
22.94 3.8772 2.7 (2,0,0)
23.38 3.8042 18.2 (0,2,2)
25.65 3.4724 2.4 (1,0,2)
26.09 3.4154 4.6 (1,2,2)
28.46 3.1365 2.4 (1,2,1)
28.64 3.1165 1.7 (1,2,3)
32.64 2.7438 71.1 (2,0,2)
32.80 2.7308 51.5 (0,2,0)
32.99 2.7154 100.0 (2,2,2)
33.12 2.7046 48.8 (0,2,4)
34.83 2.5757 2.3 (1,2,0)
38.41 2.3433 1.6 (1,1,-2)
38.60 2.3322 4.5 (3,1,2)
38.63 2.3308 2.9 (1,1,4)
39.23 2.2962 2.2 (1,3,4)
40.40 2.2326 5.4 (2,2,0)
40.67 2.2182 4.9 (2,2,4)
41.99 2.1518 1.2 (3,0,2)
42.27 2.1380 2.7 (3,2,2)
44.14 2.0516 1.4 (2,3,2)
46.78 1.9418 37.6 (0,0,4)
46.87 1.9386 38.9 (4,0,0)
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Energy Properties

Formation Energy/atom
-3.28726
eV/atom
Energy/atom
-8.23637
eV/atom
Energy above Hull
0.0692
eV/atom
Uncorrected Energy
-7.8547
eV/atom
Volume/atom
12.73
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
0.7542
μB
Mag. Ordering
NM
Mag. Sites
0
Magnetization/Volume
0.001650
μB/ų

Elastic Properties

Elastic data not available

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
0.0611
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
52.921%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
1.0932
smaller = more stable mixing
VEC
3.556
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
-96.118
kJ/mol; negative = exothermic mixing
Entropy Norm
0.9057
SS Former
0
Phase Tendency
AM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
B
Score
0.497
Family
O-rich Multi-Component
Matrix Element
O · 0.556

Related Tasks

Related computation task IDs (1)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1096895
Reference Citation

The crystal structure and related material properties of Ca2Ti2O5 were obtained from the Materials Project database (MP-ID: mp-1096895, 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_Ca2Ti2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.75438300
_cell_length_b   7.60878800
_cell_length_c   10.82059255
_cell_angle_alpha   45.87286551
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca2Ti2O5
_chemical_formula_sum   'Ca8 Ti8 O20'
_cell_volume   458.26342620
_cell_formula_units_Z   4
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  0.75760000  0.46602800  0.26575200  1.0
  Ca  Ca1  1  0.74240000  0.46602800  0.76575200  1.0
  Ca  Ca2  1  0.24505100  0.04210800  0.73592800  1.0
  Ca  Ca3  1  0.25494900  0.04210800  0.23592800  1.0
  Ca  Ca4  1  0.74505100  0.95789200  0.76407200  1.0
  Ca  Ca5  1  0.75494900  0.95789200  0.26407200  1.0
  Ca  Ca6  1  0.25760000  0.53397200  0.23424800  1.0
  Ca  Ca7  1  0.24240000  0.53397200  0.73424800  1.0
  Ti  Ti8  1  0.50000000  0.50000000  0.50000000  1.0
  Ti  Ti9  1  0.50000000  0.50000000  0.00000000  1.0
  Ti  Ti10  1  0.50000000  0.00000000  0.00000000  1.0
  Ti  Ti11  1  0.50000000  0.00000000  0.50000000  1.0
  Ti  Ti12  1  0.00000000  0.00000000  0.00000000  1.0
  Ti  Ti13  1  0.00000000  0.00000000  0.50000000  1.0
  Ti  Ti14  1  0.00000000  0.50000000  0.50000000  1.0
  Ti  Ti15  1  0.00000000  0.50000000  0.00000000  1.0
  O  O16  1  0.25454000  0.98043200  0.54403800  1.0
  O  O17  1  0.24546000  0.98043200  0.04403800  1.0
  O  O18  1  0.75492900  0.51826200  0.02595800  1.0
  O  O19  1  0.74507100  0.51826200  0.52595800  1.0
  O  O20  1  0.25492900  0.48173800  0.47404200  1.0
  O  O21  1  0.24507100  0.48173800  0.97404200  1.0
  O  O22  1  0.75454000  0.01956800  0.95596200  1.0
  O  O23  1  0.74546000  0.01956800  0.45596200  1.0
  O  O24  1  0.96196900  0.20951500  0.54131900  1.0
  O  O25  1  0.03830900  0.28139700  0.75490600  1.0
  O  O26  1  0.03703700  0.29296600  0.24574900  1.0
  O  O27  1  0.53830900  0.71860300  0.74509400  1.0
  O  O28  1  0.53703700  0.70703400  0.25425100  1.0
  O  O29  1  0.46196900  0.79048500  0.95868100  1.0
  O  O30  1  0.53803100  0.20951500  0.04131900  1.0
  O  O31  1  0.46296300  0.29296600  0.74574900  1.0
  O  O32  1  0.46169100  0.28139700  0.25490600  1.0
  O  O33  1  0.03803100  0.79048500  0.45868100  1.0
  O  O34  1  0.96296300  0.70703400  0.75425100  1.0
  O  O35  1  0.96169100  0.71860300  0.24509400  1.0
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