ELATE: Elastic tensor analysis

Welcome to ELATE, the online tool for analysis of elastic tensors, developed by Romain Gaillac and Fran├žois-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 VS2 (Materials Project id mp-1013526)

       130       16        1        0        0        0  
        16      130        1       -0        0        0  
         1        1        0        0        0        0  
         0       -0        0        1        0        0  
         0        0        0        0        1        0  
         0        0        0        0        0       57  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 32.889 GPaEV = 65.31 GPaGV = 27.933 GPaνV = 0.16904
ReussKR = -0.014085 GPaER = -0.069779 GPaGR = -0.051743 GPaνR = -0.32572
HillKH = 16.437 GPaEH = 32.605 GPaGH = 13.941 GPaνH = 0.1694

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-0.013697 GPa 1 GPa 1 GPa 57 GPa 114 GPa 146.01 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.