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 ScS2 (Materials Project id mp-862373)

        96       43       43        0        0        0  
        43       76       77        0        0        0  
        43       77       76        0        0        0  
         0        0        0       62        0        0  
         0        0        0        0       -7        0  
         0        0        0        0        0       -7

Average properties

Averaging scheme	Bulk modulus	Young's modulus	Shear modulus	Poisson's ratio
Voigt	K_V = 63.778 GPa	E_V = 42.416 GPa	G_V = 15.267 GPa	ν_V = 0.38916
Reuss	K_R = 63.526 GPa	E_R = -6.7918 GPa	G_R = -2.2374 GPa	ν_R = 0.51782
Hill	K_H = 63.652 GPa	E_H = 18.899 GPa	G_H = 6.5146 GPa	ν_H = 0.45051

Eigenvalues of the stiffness matrix

λ₁	λ₂	λ₃	λ₄	λ₅	λ₆
-7 GPa	-7 GPa	-1 GPa	57.342 GPa	62 GPa	191.66 GPa

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

Code version: 2020.07.26 (running on Python 3.7.2)