ELATE: Elastic tensor analysis

Welcome to ELATE, the online tool for analysis of elastic tensors, developed by Romain Gaillac and François-Xavier Coudert at CNRS / Chimie ParisTech.
If you use the software in published results (paper, conference, etc.), please cite the corresponding paper (J. Phys. Condens. Matter, 2016, 28, 275201) and give the website URL.

ELATE is open source software. Any queries or comments are welcome at

Summary of the properties

Input: stiffness matrix (coefficients in GPa) of NbCo2Sn (Materials Project id mp-4583)

       135      201      201        0        0        0  
       201      135      201        0        0        0  
       201      201      135        0        0        0  
         0        0        0       72        0        0  
         0        0        0        0       72        0  
         0        0        0        0        0       72

Average properties

Averaging scheme	Bulk modulus	Young's modulus	Shear modulus	Poisson's ratio
Voigt	K_V = 179 GPa	E_V = 85.238 GPa	G_V = 30 GPa	ν_V = 0.42063
Reuss	K_R = 179 GPa	E_R = -1557.9 GPa	G_R = -264 GPa	ν_R = 1.9505
Hill	K_H = 179 GPa	E_H = -448.78 GPa	G_H = -117 GPa	ν_H = 0.91786

Eigenvalues of the stiffness matrix

λ₁	λ₂	λ₃	λ₄	λ₅	λ₆
-66 GPa	-66 GPa	72 GPa	72 GPa	72 GPa	537 GPa

Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.

Code version: 2022.06.14 (running on Python 3.7.2)